CN103942011A - Differential snapshot system and use method thereof - Google Patents
Differential snapshot system and use method thereof Download PDFInfo
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Abstract
The invention discloses a differential snapshot system and a use method thereof. The system comprises a snapshot module and a thin provisioning module. The snapshot module is used for maintaining the dependency relationship of a source volume and a snapshot volume, snapshooting a strategy semantic expression and managing snapshot metadata. The thin provisioning module comprises a resource management submodule used for achieving the resource management functions on snapshots, and the functions comprise resource allocating, resource mapping and resource recovering. The snapshot module and the thin provisioning module are in communication through an interface of a general block layer. The snapshot module sends a data demand or a resource management command to the thin provisioning module to achieve communication. According to the system, semantic snapshooting and physical resource managing are uncoupled, the storage resources can be distributed according to needs, the processing logic of copy on write, redirect of write and write anywhere can be achieved, and the effective utilization rate of the snapshot resources is increased.
Description
Technical field
The present invention relates to areas of information technology, particularly the residual quantity snapping technique of field of storage.
Background technology
The SNIA of storage networking TIA (Storage Networking Industry Association), is divided into two large classes according to realizing technology by snapshot: entirely copy snapshot and residual quantity copies snapshot.Compare residual quantity snapping technique to have time overhead low with entirely copying snapshot, space availability ratio is high waits outstanding advantage, so residual quantity snapping technique is by industry member widespread use.Residual quantity snapping technique has three kinds of realizations at present, and Copy on write (COW, Copy On Write), is redirected while writing (ROW, Redirect Of Write), writes (WA, Write Anywhere) everywhere, to meet the demand of different instances.
Copy on write, principle as shown in Figure 1, creates after snapshot source volume data for the first time before coating overwrite, first the legacy data of source book is copied to as the reserved space of snapshot, again new data is write to source book, and set up concordance list and record the data block of revising after snapshot creation.Copy on write technology keeps the physical distribution of data on source book, does not therefore affect the performance of reading source volume data.But after establishment snapped volume, write first the physical copy of having introduced data, so the write performance of source book is poor, and each incremental data set is constantly dispersed in each snapped volume, the performance of reading snapped volume data can be affected.
While writing, be redirected, principle as shown in Figure 2, after creating snapshot, will be redirected to as the reserved space of snapshot the write operation of source book, and set up concordance list and come record data position, and the legacy data in source book is still kept at original position.While writing, be redirected more excellently to the write performance of source book, and each incremental data set constantly assembles and is kept in a snapped volume, and the performance of reading snapped volume data is also better than Copy on write snapshot.Yet because new data is kept in snapped volume, the distribution of the set of source data dispersion that becomes, the performance of therefore reading set of source data can be affected.In addition, source volume data collection had both left source book in and had also left in snapped volume, when deleting a snapshot, the Data Migration in snapshot need to be merged in source.
Write everywhere, as shown in Figure 3, basic thought is that all physical resources are carried out to virtual management to principle, is about to disk and the large physical block such as is cut into according to fixing granularity, set up the mapping relations that mapping table records all logical block and physical block, use the mode management data block of mapping pointer.While creating snapshot, current mapping pointer is copied a as snapshot.When data block changes, writing technology is not revised old data everywhere, but is an idle physical block of the new application of data block, then the corresponding data piece in source is shone upon to pointed new physical block, and new data is write to the storage space of new physical block.The mapping pointer of snapshot still points to the stored physical block of old data.Writing technology write performance is more excellent everywhere, and can will be write at random and be become sequential write optimization random write performance by request scheduling.When deleting snapshot, writing technology only need to carry out the reclaimer operation of data block everywhere, does not need to carry out data and merges migration.Writing technology mixes the storage space of source book and snapped volume to carry out unified management everywhere, source book and snapped volume to read performance identical.But writing technology can cause a large amount of data fragments everywhere, read request can cause a large amount of union operations, has a strong impact on the performance of reading source data and snapshot data.
By the analysis of three kinds of implementations of residual quantity snapshot is drawn to their common ground, safeguard that snapshot layer semanteme need to be new data or legacy data memory allocated space, snapshot needs support resource management function simultaneously.Comprehensive aforementioned three kinds of implementations, snapping technique is supported two kinds of mode resource management mode, i.e. space to be preserved mode and Dynamic Resource Allocation for Multimedia mode.Space to be preserved mode, just presses the reserved available resources of ratio for snapped volume while creating snapshot, belongs to static resource management, and the resource utilization of which is lower, when which is applied to Copy on write and writes, is redirected.Dynamic Resource Allocation for Multimedia mode, all available resources in system for unified management, according to demand assigned principle, allocation strategy when employing is write, the resource utilization of which is higher, still needs dynamically more new resources service condition, realize also more complicatedly, which is applied to write everywhere.
Based on above-mentioned consideration, the semantic tight coupling of resource management mode and snapshot in traditional residual quantity snapping technique, bring thus the deficiency of following several respects:
The first, in fast photographic system, need maintenance resources map information.Two kinds of resource management and allocation modes all need fast photographic system support resource mapping function, and need to revise or set up corresponding mapping relations when having new data to produce.Resource mapping administers and maintains the complicacy that has increased fast photographic system.
The second, snapshot is realized the coupling of technology and resource management mode, and according to the definition of storage networking TIA, Copy on write or be redirected as resource reservation mode while writing, does not support distribution according to need.Cause thus the utilization of resources rate of these two kinds of implementations to be difficult to improve.
Summary of the invention
In order to address the above problem, the object of the invention is to, a kind of residual quantity fast photographic system and using method thereof based on simplifying configuration-system is provided, make snapshot semanteme and the coupling of physical resource management solution, the storage resources of can distributing according to need, and can realize Copy on write, be redirected, write the processing logic of three kinds of modes while writing everywhere, improve Snapshot Resources effective rate of utilization.
For achieving the above object, the present invention proposes a kind of residual quantity fast photographic system, for the storage resources of distributing according to need, it is characterized in that, this system comprises:
Snapshot module, for safeguarding dependence, snapshot policy semanteme, the management snapshot metadata of source book and snapped volume;
Simplify configuration module, this is simplified configuration module and has resource management submodule, and for realizing the resource management function to snapshot, this function comprises that resource distribution, resource mapping, resource reclaim;
The logical volume underlying device of this snapshot module is this logical volume of simplifying configuration module, by this, simplify configuration module the resource management of this logical volume is realized to distribution according to need storage resources, this snapshot module is simplified configuration module with this and is communicated by letter by generic block layer interface, and this snapshot module sends request of data or resource management order realization communication by simplify configuration module to this.
Residual quantity fast photographic system of the present invention, is characterized in that, in this snapshot module, the snapping technique adopting is Copy on write or is redirected while writing, and at this, simplifies in configuration module, adopts distribution technique while writing, and supports to write snapshot semanteme everywhere.
Residual quantity fast photographic system of the present invention, is characterized in that, this is simplified configuration module and also comprises:
Resource pool, for physical store resource is carried out to unified virtual management, externally provides available snapshot logical block;
Physical storage device, for storing snapshot data piece;
Wherein, the resource mapping table that this snapshot logical block and this snapshot data piece are simplified in the logical volume of configuration module management by this is corresponding;
Idling-resource table, records physical resource number of blocks and information available in current resource pool.
The using method that the invention still further relates to a kind of residual quantity fast photographic system as above, is characterized in that, the method comprises snapshot module step and simplify configuration module step, wherein,
This snapshot module step, comprising:
User's request processing step, for when this snapshot module receives user's snapshot data piece write request, the applied snapshot policy of logical volume of accessing according to this write request, re-orientation processes when carrying out Copy on write processing or writing, and to this, simplify configuration layer and send and to remap order or write request, when this snapshot module receives user's read request, according to read request address and snapshot logic, determine requested data block place logical volume, to simplifying configuration layer, forward read request, after write request or read request are returned, to user, return
Data combining step, for same snapshot logical address is merged at snapshot data piece corresponding to different snapped volumes, and simplifies configuration layer to this and sends and remap order or resource reclaims order;
This simplifies configuration module step, comprising:
Write request step, for simplifying configuration module when this while receiving the write request of the snapshot data piece that snapshot module sends, according to policy selection, whether need for this snapshot data piece Resources allocation and set up the mapping relations of this snapshot data piece and Physical Resource Block, then to the request of bottom physical store module forwards, data are write to physical storage device, after having write, successively upwards return
Read request step, for simplifying configuration module when this while receiving the read request of the snapshot data piece that snapshot module sends, request is redirected to the position of data block in physical storage device, be forwarded to physical storage device, from physical storage device, sense data returns to user
Remap step, for when this, simplify configuration module receive snapshot data piece that snapshot module sends remap order time, this snapshot data piece is remapped to operation,
Resource recycling step, when the resource that receives snapshot data piece for simplify configuration module when this reclaims and orders, carries out physical resource recovery to this snapshot data piece.
The using method of residual quantity fast photographic system of the present invention, is characterized in that, described Copy on write is processed and comprised the following steps:
Step 11, source book receives user to snapshot logical block write request, inquire about the metadata in the current snapped volume that depends on this source book, judge according to this whether this is write is to the writing first of this snapshot logical block, if identify this snapshot logical block in the metadata of this snapped volume without effective snapshot data piece, for writing first, execution step 12, otherwise, execution step 13
Step 12, this snapshot source book remaps order to i.e. this logical volume transmission of simplifying configuration-system of underlying device, the legacy version snapshot data piece that this snapshot logical block is corresponding is remapped to snapped volume logical space from source book logical space, upgrade this snapped volume metadata, and the mathematical logic unit of notifying this source book has completed the logic copy to the corresponding snapshot data piece of this snapshot logical block
Step 13, this source book is transmitted to underlying device by this snapshot data write request of user, simplifies configuration logic volume, and this snapshot write request is returned to rear line layer and is returned;
When this is write, re-orientation processes comprises the following steps:
Step 21, source book receives user to snapshot logical block write request, and inquiry depends on the current snapped volume of this source book, and write request is redirected to this snapped volume logical space,
Step 22, this snapped volume receives user's snapshot logical block write request, and is transmitted to underlying device,
Step 23, this write request is returned to rear renewal snapped volume metadata, and returns to client layer.
The using method of residual quantity fast photographic system of the present invention, it is characterized in that, this data combining step is specially: if will exist the snapshot data piece corresponding to snapshot logical block B of effective snapshot data piece to merge to snapshot logical volume LV1 in snapshot logical volume LV2, wherein LV1, LV2 are same source book at snapped volume in the same time not, or source book and snapped volume
If the data set in this snapshot logical volume LV1 is the data set in this snapshot logical volume LV2 newly, carry out following steps:
Step 41, this snapshot logical block B in this snapshot logical volume LV2, checks the metadata in this snapshot logical volume LV1, judges and in this volume, whether has the redaction of snapshot logical block snapshot data piece, if having, perform step 42, otherwise execution step 43,
Step 42, the resource that this snapshot module sends this snapshot logical block to this snapshot logical volume LV2 bottom logical volume reclaims order, after this order is successfully returned, upgrade the metadata of this snapshot logical volume LV2, by this snapshot logical block identification, be without effective snapshot data piece, complete the versions merging to snapshot data piece corresponding to this snapshot logical block
Step 43, this snapshot module sends the order that remaps of this snapshot logical block to this snapshot logical volume LV2 bottom logical volume, the snapshot data piece that this snapshot logical block is corresponding is remapped to this snapshot logical volume LV1 bottom logical volume from this snapshot logical volume LV2 bottom logical volume, wherein, this remaps order and comprises following parameters, the logical block number (LBN) of this snapshot logical block, source mapped device, objective mapping equipment
Step 44, after this remaps order and successfully returns, upgrade respectively the metadata of this snapshot logical volume LV1 and this snapshot logical volume LV2, metadata in this snapshot logical volume LV1 is designated to this snapshot logical block and has effective snapshot data piece, the metadata of this snapshot logical volume LV2 is designated to this snapshot logical block and does not have effective snapshot data piece, complete the versions merging to snapshot data piece corresponding to this snapshot logical block;
If the old data set in this snapshot logical volume LV2 of the data set in this snapshot logical volume LV1 carries out following steps:
Step 51, for this snapshot logical block B in this snapshot logical volume LV2, to this, simplify the order that remaps that configuration-system sends this snapshot logical block, the snapshot data piece that this snapshot logical block B is corresponding is remapped to the bottom logical volume of this snapshot logical volume LV1 from the bottom logical volume of this snapshot logical volume LV2, this remaps order and comprises following parameters, the logical block number (LBN) of this snapshot logical block, source mapped device, objective mapping equipment
Step 52, after this remaps order and successfully returns, merge the metadata of this snapshot logical block in this snapshot logical volume LV1 and this snapshot logical volume LV2, and upgrade accordingly the metadata of this snapshot logical volume LV1, and upgrade the metadata of this snapshot logical volume LV2, by this snapshot logical block identification, be without effective snapshot data piece, now the merging of this snapshot data piece completed
Wherein, this remaps the underlying device that source mapped device in command parameter and objective mapping equipment are respectively snapshot logical volume LV2 and LV1, and in this snapshot logical volume LV2, effective snapshot data piece corresponding to all snapshot logical blocks all merges to this snapshot logical volume LV1, and the data union operation of this snapshot logical volume LV2 and this snapshot logical volume LV1 completes.
The using method of residual quantity fast photographic system of the present invention, is characterized in that, in simplifying configuration module step, described write request step is specially,
Step 61, this logical volume of simplifying configuration module receives upper strata write request, in this logical volume resource mapping table, search the mapping item of current snapshot logical block, if this snapshot logical block does not have associated corresponding Physical Resource Block in map information, to the writing first of this snapshot logical block, execution step 62; Otherwise execution step 64;
Step 62 is this snapshot logical block Resources allocation from the resource pool of this resource management module, upgrades the idling-resource record in resource pool;
Step 63, sets up the mapping relations of this snapshot logical block and Physical Resource Block, the information of adding this Physical Resource Block in the mapping item of this snapshot logical block, and this information comprises physical storage device and the address at this Physical Resource Block place;
Step 64, is transmitted to physical store module by write request;
Step 65, this physical store module is successively upwards returned after writing and returning.
The using method of residual quantity fast photographic system of the present invention, is characterized in that, in simplifying configuration module step, described read request step is specially,
Step 71, this logical volume of simplifying configuration module receives upper strata read request, in the resource mapping table of this logical volume, search resource mapping item corresponding to snapshot logical block that this read request is accessed, obtain the address of the snapshot data piece corresponding with this snapshot logical block in physical storage device;
Step 72, is redirected to this memory location of snapshot data piece in physical storage device by read request, is forwarded to physical store module;
Step 73, after underlying device is returned, successively upwards returns.
The using method of residual quantity fast photographic system of the present invention, is characterized in that, in simplifying configuration module step, described in remap step and be specially,
Step 81, this is simplified configuration module and receives and remap order, parsing remaps operating parameter, obtain this and remap the required logical block number (LBN) of operation, source mapping logic volume, objective mapping logical volume, if mapping logic volume in source is LV3, objective mapping logical volume is LV4, and snapshot logical block to be remapped is B;
Step 82, in the resource mapping table of this source mapping logic volume LV3, search mapping item corresponding to this snapshot logical block B, if in this mapping this snapshot logical block B association Physical Resource Block, obtain its corresponding Physical Resource Block P, execution step 83, otherwise execution step 87;
Step 83 is searched mapping item that should snapshot logical block B in the resource mapping table of this objective mapping logical volume LV4, if find corresponding mapping, obtains its corresponding Physical Resource Block Q, and performs step 84, otherwise execution step 85;
Step 84, cancellation snapshot logical block is associated with Physical Resource Block Q's, discharges the Physical Resource Block Q that in this objective mapping logical volume LV4, this snapshot logical block B takies, and upgrades idle resource record in shared resource pond;
Step 85, in the resource mapping table of this objective mapping logical volume LV4, this snapshot logical block B is associated with Physical Resource Block P, revise mapping item corresponding to this snapshot logical block B, write this Physical Resource Block P information of this snapshot logical block association, this information comprises Physical Resource Block place physical equipment, and the address in this physical equipment;
Step 86 is cancelled the associated of this snapshot logical block B and this Physical Resource Block P in the resource mapping table of this source mapping logic volume LV3, remaps and has operated;
Step 87, returns to upper strata.
The using method of residual quantity fast photographic system of the present invention, is characterized in that, in simplifying configuration module step, described resource recycling step is specially,
Step 91, this is simplified configuration module and receives resource recovery order, and analytic parameter, obtains logical volume, logical block information;
Step 92 is searched the mapping item of counterlogic piece in this parameter is specified the resource mapping table of logical volume, if associated corresponding Physical Resource Block in this mapping performs step 93, otherwise execution step 95;
Step 93, cancels this logical block and Physical Resource Block mapping relations, and discharges mapped physical resource;
Step 94, upgrades resource pool idling-resource record;
Step 95, returns to upper strata.
Good effect of the present invention is:
The first, simplify the combination of configuration-system and snapping technique, on the one hand, physical resource management is separated from fast photographic system, snapshot layer only need to safeguard that snapshot is semantic, without carrying out complicated resource management; On the other hand, realized global resource dynamic-configuration, snapshot implementation and resource management mode decoupling zero, Copy on write, be redirected semanteme while writing and do not need predistribution snapshot space.
The second, simplify configuration-system and realize and to write mechanism everywhere, when snapshot layer is safeguarded Copy on write and writes, be redirected semanticly, realize Copy on write, be redirected nested with writing technology everywhere while writing.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the Copy on write in residual quantity snapshot implementation;
Redirected principle schematic when Fig. 2 is writing in residual quantity snapshot implementation;
Fig. 3 is the principle schematic of writing everywhere in residual quantity snapshot implementation;
Fig. 4 is the logical organization schematic diagram of residual quantity fast photographic system of the present invention;
Fig. 5 is the illustrative view of functional configuration of residual quantity fast photographic system of the present invention;
Fig. 6 is the semantic nested schematic diagram of the snapshot of residual quantity fast photographic system of the present invention;
Fig. 7 is the process flow diagram of the Copy on write treatment step of residual quantity fast photographic system of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing, residual quantity fast photographic system of the present invention and using method thereof are further elaborated.Should be appreciated that embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The present invention provides source book and snapped volume two logic of class volumes to user, and wherein snapped volume depends on source book.The logical volume underlying device of snapshot module is to simplify the logical volume that configuration module is derived.The comprehensive Copy on write of the present invention, be redirected, write the processing logic of three kinds of implementations while writing everywhere, the logic function of snapshot has been carried out to abstract division, its hierarchical structure as shown in Figure 2, functional structure as shown in Figure 3, by simplifying configuration-system, the management of this module logical volume is realized to resource configure as required, snapshot module only need safeguard that snapshot is semantic, redirect logic when realizing Copy on write or writing.
Snapshot module is communicated by letter by interface module with simplifying configuration module, and snapshot module, by configuration module is sent out request or resource management order realizes communication to simplifying, relates to user and asks processing and data to merge two processes.General steps is divided into snapshot module step and simplifies configuration module step according to system architecture.By take a snapshot data piece of snapshot module, be this step of object factory below.
One, snapshot module step
This step specifically comprises user's write request treatment step, user's read request treatment step, data combining step, successively these steps is further described below.
1, user's write request treatment step
When receiving user's write request, if carry out Copy on write, carry out the following step:
Step 11, source book receives user to snapshot logical block write request, inquire about the metadata in the current snapped volume that depends on this source book, judge accordingly whether this is write is writing first this snapshot data piece, if identify this snapshot logical block in the metadata of this snapped volume, without effective snapshot data piece, for writing first, perform step 12, otherwise, execution step 13
Step 12, this snapshot source book remaps order to i.e. this logical volume transmission of simplifying configuration-system of underlying device, old data block is remapped to snapped volume logical space from source book logical space, upgrade this snapped volume metadata, and the mathematical logic unit of notifying this source book has completed the logic copy to this snapshot data piece
Step 13, this source book is transmitted to underlying device by this snapshot data write request of user, after write request is returned, returns to client layer;
If re-orientation processes while writing is carried out the following step:
Step 21, source book receives user to snapshot logical block write request, and inquiry depends on the current snapped volume of this source book, and this is redirected to this snapped volume logical space by write request,
Step 22, this snapped volume receives user's snapshot logical block write request, and is transmitted to underlying device,
Step 23, this write request is returned to rear renewal snapped volume metadata, and returns to client layer.
2, user's read request treatment step
This user's read request is identical with the processing logic of SNIA definition, is divided into and reads snapshot source book and read snapped volume.
Step 31, user reads snapshot source book, and concrete steps are as follows:
Step 311, if Copy on write mode is carried out following steps:
(a) read request is redirected to the bottom logical volume of this snapshot source book, and the bottom that is transmitted to source book is simplified configuration module logical volume;
(b) simplify configuration module logical volume and receive read request and carry out and to read flow process, the data of reading are returned to upper strata;
(c) snapshot source book is received returning of bottom logical volume, directly to user, returns.
Step 312, if be redirected mode while writing, carry out following steps:
(a) this snapshot source book receives user's read request, searches the current snapped volume that depends on this snapshot source book;
(b) check the metadata corresponding to logical block of asking in current snapped volume, determine whether to exist the valid data of this logical block, if do not perform step (c); Otherwise execution step (d);
(c) obtain forerunner's snapshot logical volume of current snapped volume, and using this forerunner's snapshot logical volume as current snapped volume, carry out (b);
(d) read request is redirected to this current snapped volume, and snapped volume receives the logical volume of simplifying configuration module that read request is directly transmitted to its bottom;
(e) simplify configuration module logical volume and receive after read request, carry out this layer and read flow process, request is forwarded to bottom physical storage device, and the data of reading are successively upwards returned.
Step 32, user reads snapped volume, carries out following steps:
Step 321, if Copy on write mode is carried out following steps:
(a) current snapped volume receives user's read request, and whether the metadata that checks this volume the data of request to some extent, if carry out (b); Otherwise carry out (c);
(b) obtain forerunner's logical volume of current snapped volume, and this logical volume is carried out to (a) as current snapped volume;
(c) what current snapped volume was transmitted to bottom by request simplifies configuration module logical volume;
(d) bottom logical volume receives read request and carries out this layer and read flow process;
(e) data of reading are successively upwards returned.
Step 322, if be redirected mode while writing, carry out following steps:
(a) snapped volume receives read request, obtains forerunner's logical volume of this snapped volume, read request is redirected to forerunner's logical volume of this snapped volume;
(b) this forerunner's logical volume receives read request, checks the metadata in this volume, judges whether the data of asking to some extent, if there are not asked data in this logical volume, carries out (c), otherwise carries out (d);
(c) using this forerunner's logical volume as current request logical volume, obtain forerunner's logical volume of this current request logical volume, read request is redirected to this forerunner's logical volume, carry out (b);
(d) request is transmitted to the logical volume of simplifying configuration module of bottom;
(e) logical volume of simplifying configuration module receives read request, carries out this layer and reads flow process;
(f) data of reading are successively upwards returned.
3, data combining step
In the time the snapshot data in two snapped volumes need to being carried out to versions merging, carry out following steps,
The data that data merge during the valid data in LV2 volume are rolled up with LV1 are one by one done versions merging.With the valid data versions merging of snapshot logical block B, being operating as example below sets forth.
If snapshot logical block B corresponding effective snapshot data piece in logical volume LV2 is merged to logical volume LV1, wherein LV1, LV2 are same source book at snapped volume in the same time not, if the data set in this logical volume LV1 is the data set in this logical volume LV2 newly, carry out following steps:
Step 41, this snapshot logical block B for there is effective snapshot data piece in this logical volume LV2, checks the metadata in this logical volume LV1, judge and in this logical volume LV1, whether have the redaction snapshot data of this snapshot logical block piece, if have, perform step 42, otherwise execution step 43
Step 42, this logical volume LV2 gives the resource of this snapshot logical block B to reclaim order to the configuration logic curly hair of simplifying of bottom, after this order is successfully returned, upgrade the metadata of this logical volume LV2, by this snapshot logical block identification, be without effective snapshot data piece, complete the versions merging to snapshot data piece corresponding to this snapshot logical block B
Step 43, this logical volume LV2 simplifies to this of bottom order that remaps that configuration logic curly hair is given this snapshot logical block B, the snapshot data piece that this snapshot logical block is corresponding is remapped to this logical volume LV1 bottom logical volume from this logical volume LV2 bottom logical volume, wherein, this remaps order and comprises following parameters, the logical block number (LBN) of this snapshot logical block, source mapping logic volume, objective mapping logical volume
Step 44, after this remaps order and successfully returns, upgrade respectively the metadata of this logical volume LV1 and this logical volume LV2, metadata in this logical volume LV1 is designated to this snapshot logical block and has effective snapshot data piece, the metadata of this logical volume LV2 is designated to this snapshot logical block and does not have effective snapshot data piece, complete the versions merging to snapshot data piece corresponding to this snapshot logical block B;
If the old data set in this logical volume LV2 of the data set in this logical volume LV1 carries out following steps:
Step 51, for this snapshot logical block B in this logical volume LV2, to this, simplify the order that remaps that configuration-system sends this snapshot logical block B, the snapshot data piece that this snapshot logical block B is corresponding is remapped to this logical volume LV1 bottom logical volume from this logical volume LV2 bottom logical volume, this remaps order and comprises following parameters, the logical block number (LBN) of this snapshot logical block, source mapping logic volume, objective mapping logical volume
Step 52, after this remaps order and successfully returns, merge the metadata of this snapshot logical block B in LV1 and LV2, and upgrade accordingly the metadata of this LV1, and upgrade the metadata of LV2, by this snapshot logical block identification, be without effective snapshot data piece, now the versions merging of the snapshot data piece of this snapshot logical block B completed
Wherein, this source mapping logic volume and objective mapping logical volume that remaps in command parameter is respectively the bottom logical volume of logical volume LV2 and LV1, effective snapshot data piece that all snapshot logical blocks are corresponding in this logical volume LV2 all merges to this logical volume LV1, and the data union operation of this logical volume LV2 and this logical volume LV1 completes.
Two, simplify configuration module step
In simplifying configuration module step, comprise write request step, read request step, remap step, resource recycling step etc.
1, write request step
This step is specially:
Step 61, this logical volume of simplifying configuration module receives upper strata write request, in the resource mapping table of this volume, search the map information of current snapshot logical block, if do not find this snapshot logical block map information associated with Physical Resource Block, to the writing first of this snapshot logical block, execution step 62; Otherwise execution step 64;
Step 62 is this snapshot logical block Resources allocation from the resource pool of this resource management module, upgrades the idling-resource record in resource pool;
Step 63, set up the mapping relations of this snapshot logical block and Physical Resource Block, in the mapping that this snapshot logical block is corresponding in the resource mapping table of this logical volume, increase the information of this Physical Resource Block, this information comprises physical storage device and the address at this Physical Resource Block place;
Step 64, is transmitted to physical store module by write request;
Step 65, this physical store module is returned to upper strata after writing and returning.
2, read request step
This step is specially:
Step 71, this logical volume of simplifying configuration module receives upper strata read request, searches corresponding resource mapping item in resource mapping table, obtains physical equipment and the physical address of this read request desired data piece of storage;
Step 72, is redirected to this memory location of snapshot data piece in physical storage device by read request, is forwarded to physical store module;
Step 73, underlying device is successively upwards returned after returning to this module.
3, remap step
The source book of snapshot layer or the semanteme of snapped volume are transparent to simplifying configuration module, simplify source book or snapped volume that configuration module is not distinguished snapshot module, only distinguish source device and the target device that remaps operation, i.e. source logical volume and target logic volume.The snapshot logical block of take below remaps the step of operation as object factory.
This step is specially:
Step 81, this is simplified configuration module and receives and remap order, resolves and remaps operating parameter, be source mapping logic volume, logical block number (LBN), objective mapping logical volume information, suppose that source mapping logic volume is LV3, objective mapping logical volume is LV4, and snapshot logical block to be remapped is B;
Step 82, in the resource mapping table of this source mapping logic volume LV3, search mapping item corresponding to this snapshot logical block B, if in this mapping this snapshot logical block B association Physical Resource Block, obtain its corresponding Physical Resource Block P, execution step 83, otherwise execution step 87;
Step 83, in the resource mapping table of this objective mapping logical volume LV4, search mapping item that should snapshot logical block B, if associated corresponding Physical Resource Block in the mapping item of this snapshot logical block B obtains this Physical Resource Block Q, and perform step 84, otherwise execution step 85;
Step 84, cancellation snapshot logical block is associated with Physical Resource Block Q's, discharges the Physical Resource Block Q that in this target logic volume LV4, this snapshot logical block B takies, and upgrades idle resource record in shared resource pond;
Step 85, in the resource mapping table of this target logic volume LV4, this snapshot logical block B is associated with Physical Resource Block P, revise the mapping item of this snapshot logical block B, write the information of this Physical Resource Block P, this information comprises physical storage device and the physical address at this Physical Resource Block place;
Step 86 is cancelled the associated of this snapshot logical block B and this Physical Resource Block P in the resource mapping table of this source mapping logic volume LV3, remaps and has operated;
Step 87, returns to upper strata.
4, resource recycling step
This step is specially:
Step 91, this is simplified configuration module and receives resource recovery order, and analytic parameter, obtains logical volume, logical block information;
Step 92 is searched the mapping item of counterlogic piece in the resource mapping table of parameter appointment logical volume, if find corresponding mapping to perform step 93, otherwise execution step 95;
Step 93, cancels logical block and Physical Resource Block mapping relations, and discharges mapped physical resource;
Step 94, upgrades resource pool idling-resource record;
Step 95, returns to upper strata.
The present invention has the following advantages:
The first, snapshot is semantic to be coupled with physical resource management solution, and resource management is transparent to snapshot layer.Simplify configuration-system and realize resource management function as basic-level support technology, its Core Feature comprises resource distribution, resource mapping, resource recovery etc.; Snapshot layer Core Feature comprises safeguards snapshot semanteme, safeguards dependence, management snapshot layer metadata (whether identification data block exists valid data in snapped volume logical space) between snapped volume, redirect logic when realizing Copy on write or writing.
The second, simplify configuration-system according to distribution according to need principle, carry out allocation strategy while writing, realize and write semanteme everywhere, and can be optimized for sequential write by writing at random, improve write performance.
The 3rd, resource management and snapshot semanteme separated both solved Copy on write, reset the problem with resource distribution according to need combination while writing, realized Copy on write simultaneously, be redirected while writing and write everywhere machine-processed nested, as shown in Figure 4.
Claims (10)
1. a residual quantity fast photographic system, for the storage resources of distributing according to need, is characterized in that, this system comprises:
Snapshot module, for safeguarding dependence, snapshot policy semanteme, the management snapshot metadata of source book and snapped volume;
Simplify configuration module, this is simplified configuration module and has resource management submodule, and for realizing the resource management function to snapshot, this function comprises that resource distribution, resource mapping, resource reclaim;
The logical volume underlying device of this snapshot module is this logical volume of simplifying configuration module, by this, simplify configuration module the management of this logical volume is realized to distribution according to need storage resources, this snapshot module is simplified configuration module with this and is communicated by letter by generic block layer interface, and this snapshot module sends request of data or resource management order realization communication by simplify configuration module to this.
2. residual quantity fast photographic system as claimed in claim 1, is characterized in that, in this snapshot module, the snapping technique adopting is Copy on write or is redirected while writing, and at this, simplifies in configuration module, adopts distribution technique while writing, and supports to write snapshot semanteme everywhere.
3. residual quantity fast photographic system as claimed in claim 1, is characterized in that, this is simplified configuration module and also comprises:
Resource pool, for physical store resource is carried out to unified virtual management, externally provides available snapshot logical block;
Physical storage device, for storing snapshot data piece;
Wherein, the resource mapping table that this snapshot logical block and this snapshot data piece are simplified in the logical volume of configuration module management by this is corresponding;
Idling-resource table, records physical resource number of blocks and information available in current resource pool.
4. the using method to the residual quantity fast photographic system described in claim 1-3, is characterized in that, the method comprises snapshot module step and simplify configuration module step, wherein,
This snapshot module step, comprising:
User's request processing step, for when this snapshot module receives user's snapshot data piece write request, the applied snapshot policy of logical volume of accessing according to this write request, re-orientation processes when carrying out Copy on write processing or writing, and to this, simplify configuration layer and send and to remap order or write request, when this snapshot module receives user's read request, according to read request address and snapshot logic, determine requested data block place logical volume, to simplifying configuration layer, forward read request, after write request or read request are returned, to user, return
Data combining step, for same snapshot logical address is merged at snapshot data piece corresponding to different snapped volumes, and simplifies configuration layer to this and sends and remap order or resource reclaims order;
This simplifies configuration module step, comprising:
Write request step, for simplifying configuration module when this while receiving the write request of the snapshot data piece that snapshot module sends, according to policy selection, whether need for this snapshot data piece Resources allocation and set up the mapping relations of this snapshot data piece and Physical Resource Block, then to the request of bottom physical store module forwards, data are write to physical storage device, after having write, successively upwards return
Read request step, for simplifying configuration module when this while receiving the read request of the snapshot data piece that snapshot module sends, request is redirected to the position of data block in physical storage device, be forwarded to physical storage device, from physical storage device, sense data returns to user
Remap step, for when this, simplify configuration module receive snapshot data piece that snapshot module sends remap order time, this snapshot data piece is remapped to operation,
Resource recycling step, when the resource that receives snapshot data piece for simplify configuration module when this reclaims and orders, carries out physical resource recovery to this snapshot data piece.
5. the using method of residual quantity fast photographic system as claimed in claim 4, is characterized in that, described Copy on write is processed and comprised the following steps:
Step 11, source book receives user to snapshot logical block write request, inquire about the metadata in the current snapped volume that depends on this source book, judge according to this whether this is write is to the writing first of this snapshot logical block, if identify this snapshot logical block in the metadata of this snapped volume without effective snapshot data piece, for writing first, execution step 12, otherwise, execution step 13
Step 12, this snapshot source book remaps order to i.e. this logical volume transmission of simplifying configuration-system of underlying device, the legacy version snapshot data piece that this snapshot logical block is corresponding is remapped to snapped volume logical space from source book logical space, upgrade this snapped volume metadata, and the mathematical logic unit of notifying this source book has completed the logic copy to the corresponding snapshot data piece of this snapshot logical block
Step 13, this source book is transmitted to underlying device by this snapshot data write request of user, simplifies configuration logic volume, and this snapshot write request is returned to rear line layer and is returned;
When this is write, re-orientation processes comprises the following steps:
Step 21, source book receives user to snapshot logical block write request, and inquiry depends on the current snapped volume of this source book, and write request is redirected to this snapped volume logical space,
Step 22, this snapped volume receives user's snapshot logical block write request, and is transmitted to underlying device,
Step 23, this write request is returned to rear renewal snapped volume metadata, and returns to client layer.
6. the using method of residual quantity fast photographic system as claimed in claim 4, is characterized in that, this data combining step is specially:
If will exist the snapshot data piece corresponding to snapshot logical block B of effective snapshot data piece to merge to snapshot logical volume LV1 in snapshot logical volume LV2, wherein LV1, LV2 be same source book at snapped volume in the same time not, or source book and snapped volume,
If the data set in this snapshot logical volume LV1 is the data set in this snapshot logical volume LV2 newly, carry out following steps:
Step 41, this snapshot logical block B in this snapshot logical volume LV2, checks the metadata in this snapshot logical volume LV1, judges and in this volume, whether has the redaction of snapshot logical block snapshot data piece, if having, perform step 42, otherwise execution step 43,
Step 42, the resource that this snapshot module sends this snapshot logical block to this snapshot logical volume LV2 bottom logical volume reclaims order, after this order is successfully returned, upgrade the metadata of this snapshot logical volume LV2, by this snapshot logical block identification, be without effective snapshot data piece, complete the versions merging to snapshot data piece corresponding to this snapshot logical block
Step 43, this snapshot module sends the order that remaps of this snapshot logical block to this snapshot logical volume LV2 bottom logical volume, the snapshot data piece that this snapshot logical block is corresponding is remapped to this snapshot logical volume LV1 bottom logical volume from this snapshot logical volume LV2 bottom logical volume, wherein, this remaps order and comprises following parameters, the logical block number (LBN) of this snapshot logical block, source mapped device, objective mapping equipment
Step 44, after this remaps order and successfully returns, upgrade respectively the metadata of this snapshot logical volume LV1 and this snapshot logical volume LV2, metadata in this snapshot logical volume LV1 is designated to this snapshot logical block and has effective snapshot data piece, the metadata of this snapshot logical volume LV2 is designated to this snapshot logical block and does not have effective snapshot data piece, complete the versions merging to snapshot data piece corresponding to this snapshot logical block;
If the old data set in this snapshot logical volume LV2 of the data set in this snapshot logical volume LV1 carries out following steps:
Step 51, for this snapshot logical block B in this snapshot logical volume LV2, to this, simplify the order that remaps that configuration-system sends this snapshot logical block, the snapshot data piece that this snapshot logical block B is corresponding is remapped to the bottom logical volume of this snapshot logical volume LV1 from the bottom logical volume of this snapshot logical volume LV2, this remaps order and comprises following parameters, the logical block number (LBN) of this snapshot logical block, source mapped device, objective mapping equipment
Step 52, after this remaps order and successfully returns, merge the metadata of this snapshot logical block in this snapshot logical volume LV1 and this snapshot logical volume LV2, and upgrade accordingly the metadata of this snapshot logical volume LV1, and upgrade the metadata of this snapshot logical volume LV2, by this snapshot logical block identification, be without effective snapshot data piece, now the merging of this snapshot data piece completed
Wherein, this remaps the underlying device that source mapped device in command parameter and objective mapping equipment are respectively snapshot logical volume LV2 and LV1, and in this snapshot logical volume LV2, effective snapshot data piece corresponding to all snapshot logical blocks all merges to this snapshot logical volume LV1, and the data union operation of this snapshot logical volume LV2 and this snapshot logical volume LV1 completes.
7. the using method of residual quantity fast photographic system as claimed in claim 4, is characterized in that, in simplifying configuration step, described write request step is specially,
Step 61, this logical volume of simplifying configuration module receives upper strata write request, in this logical volume resource mapping table, search the mapping item of current snapshot logical block, if this snapshot logical block does not have associated corresponding Physical Resource Block in map information, to the writing first of this snapshot logical block, execution step 62; Otherwise execution step 64;
Step 62 is this snapshot logical block Resources allocation from the resource pool of this resource management module, upgrades the idling-resource record in resource pool;
Step 63, sets up the mapping relations of this snapshot logical block and Physical Resource Block, the information of adding this Physical Resource Block in the mapping item of this snapshot logical block, and this information comprises physical storage device and the address at this Physical Resource Block place;
Step 64, is transmitted to physical store module by write request;
Step 65, this physical store module is successively upwards returned after writing and returning.
8. the using method of residual quantity fast photographic system as claimed in claim 4, is characterized in that, in simplifying configuration step, described read request step is specially,
Step 71, this logical volume of simplifying configuration module receives upper strata read request, in the resource mapping table of this logical volume, search this read request and access the resource mapping item that snapshot logical block is corresponding, obtain the address in physical storage device of the snapshot data piece corresponding with this snapshot logical block;
Step 72, is redirected to this memory location of snapshot data piece in physical storage device by read request, is forwarded to physical store module;
Step 73, underlying device is successively upwards returned after returning to this module.
9. the using method of residual quantity fast photographic system as claimed in claim 4, is characterized in that, in simplifying configuration step, described in remap step and be specially,
Step 81, this is simplified configuration module and receives and remap order, parsing remaps operating parameter, obtain this and remap the required logical block number (LBN) of operation, source mapping logic volume, objective mapping logical volume, if mapping logic volume in source is LV3, objective mapping logical volume is LV4, and snapshot logical block to be remapped is B;
Step 82, in the resource mapping table of this source mapping logic volume LV3, search mapping item corresponding to this snapshot logical block B, if in this mapping this snapshot logical block B association Physical Resource Block, obtain its corresponding Physical Resource Block P, execution step 83, otherwise execution step 87;
Step 83, in the resource mapping table of this objective mapping logical volume LV4, search mapping item that should snapshot logical block B, if in this mapping this snapshot logical block B association Physical Resource Block, obtain this Physical Resource Block Q, and perform step 84, otherwise execution step 85;
Step 84, cancellation snapshot logical block is associated with Physical Resource Block Q's, discharges the Physical Resource Block Q that in this objective mapping logical volume LV4, this snapshot logical block B takies, and upgrades idle resource record in shared resource pond;
Step 85, in the resource mapping table of this objective mapping logical volume LV4, this snapshot logical block B is associated with Physical Resource Block P, revise mapping item corresponding to this snapshot logical block B, write this Physical Resource Block P information of this snapshot logical block association, this information at least comprises Physical Resource Block place physical equipment, and the address in this physical equipment;
Step 86 is cancelled the associated of this snapshot logical block B and this Physical Resource Block P in the resource mapping table of this source mapping logic volume LV3, remaps and has operated;
Step 87, returns to upper strata.
10. the using method of residual quantity fast photographic system as claimed in claim 4, is characterized in that, in simplifying configuration step, described resource recycling step is specially,
Step 91, this is simplified configuration module and receives resource recovery order, and analytic parameter, obtains logical volume, logical block information;
Step 92 is searched the mapping item of counterlogic piece in this parameter is specified the resource mapping table of logical volume, if associated corresponding Physical Resource Block in this mapping performs step 93, otherwise execution step 95;
Step 93, cancels this logical block and Physical Resource Block mapping relations, and discharges mapped physical resource;
Step 94, upgrades resource pool idling-resource record;
Step 95, returns to upper strata.
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