CN101997919B - Storage resource management method and device - Google Patents
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Abstract
The invention provides a storage resource management method and a network storage system. The network storage system comprises a storage controller and a plurality of disks, wherein a plurality of Raid arrays are established by the disks; a front port of the storage controller is connected with a host through a network; and a rear disk port is connected with the disks. The management method comprises the following steps of: partitioning an array space through resource blocks of preset sizes; establishing a corresponding block list for recording whether the resource blocks are occupied; in the process of establishing logical resources, allocating the resource blocks and establishing a logical resource index list so as to record the corresponding relationship of the logical resources and the resource blocks and record the sizes of the resource blocks; and taking the resource blocks as units for management operation of the logical resources, and updating the block list and the logical resource index list after the management operation. The management method is simple and flexible, high in expansibility, easy to implement and lower in cost.
Description
Technical field
The present invention relates to Network storage technology, relate in particular to a kind of stratified management technology of storage resources.
Background technology
In the network environment of the data storage that relates to numerous main frames, in order to improve reliability and the fail safe of data storage, for autgmentability and the flexibility of memory capacity, Network storage technology is arisen at the historic moment simultaneously.As a rule, the effect of network store system is to provide available memory space for client PC or server (generally being referred to as main frame or Host).
The core of network store system is storage control (Controller), and storage control carries out data and processes and write data in the back-end physical disk.For raising is write the performance of physical disk and data redundancy is provided, storage control is supported Redundant Array of Independent Disks (RAID) (Raid) technology usually, can provide various other performances of level and reliability according to other difference of Raid level, namely can guarantee in most cases, in the situation of the fault of one or more disk, data in it can be recovered by corresponding checking algorithm, i.e. usually said Raid array rebuild.The front end of network store system can be connected with main frame (Host) by IP network or FC network, for main frame provides data storage service.In data transmission, take based on the network store system of IP carrying as example, main frame can measured ISCSI (Internet Small Computer Systems Interface) protocol network storage system carries out the read-write operation of data.
Reading and writing data for convenience of main frame, to main frame shielding storage resources difference physically, can carry out abstract to the physical store resource by Intel Virtualization Technology, form the logical resource of user oriented main frame more than physical layer, and corresponding formation logic resource address mapping table is to record the mapping relations of logical address and physical address.
For user's various application, using for every kind needs the data of storage and access that life cycle is arranged, such as Mobile Meterage Systems, the telephone expenses data of mobile phone may repeatedly be accessed in three months after data generate per month, accessed once in a while in 1 year, then may just nobody shows any interest in, become filing data; backward but only have the time limit that has arrived regulation when it, could be deleted.
For network store system, even same network store system, disk type, disk running speed etc. affect the performance of disk, on this basis, disk type difference, the number of disks that forms the Raid array is different, array Raid rank difference, and the Performance And Reliability of Raid array is also different.Therefore the concept that the data hierarchy storage occurred." layering " refers to according to the actual count data of client to data storage and access, the data that the user is stored in network store system are moved on different Raid arrays, namely the long-time data Autonomic Migration Framework of not accessing of handle is to slower, the lower-cost Raid array of speed, as the SATA disk, reduce hardware cost with this; And those often accessed or important data be placed on the higher Raid array of speed, cost, as SAS disk, SSD disk, come improving performance with this.The simultaneously migration of data is that the aspect below logical resource is carried out, and whole process is transparent for the user, and the logical mappings unit in system can not change logical address to the mapping of physical address according to the result of migration.
The multi-zone supervision technology of more common network store system resource has two kinds at present.A kind of segment management that is based on the Raid array, its hierarchical structure as shown in Figure 1.Basic management process is as follows: the first step: use disk to create the Raid array; Second step: the free segment with the Raid array creates logical resource, can create a plurality of logical resources on a Raid array, and a logical resource can be distributed in a plurality of RAID.
In this way to manage, Raid array and logical resource are the relations of multi-to-multi, so storage space management is simple relatively flexibly, get final product for logical resource increases new section.Segment management based on the Raid array, logical resource and Raid array all need to safeguard resource placement's mapping relations of multi-to-multi, the size of each section depends on the idle physical segment size of Raid array and the logical resource size that will create, and the length of section is not what fix.Yet there is certain drawback in this administrative skill.On the one hand, the section on logical resource and Raid array is when more, after repeatedly creating, deleting logical resource, will produce a large amount of fragments; On the other hand, for the demand of AUTOMATIC ZONING, if whole section migration, the granularity of migration can be larger, target phase that might the size of the section of finding can satisfy the demands in the Raid array; If the migration partial data may need existing section section again, fragment is more, manages more complicated; In general, support that based on the segment management of Raid array the cost of AUTOMATIC ZONING is larger.
Another kind of existing administrative skill is the way to manage of logical resource and the unification of Raid array, and its hierarchical structure as shown in Figure 2.Its basic management step is as follows: the first step: use disk to create the disk group, the disk group represents one group of disk, is not Raid array entity; Second step: form based on disk and build the Raid array, the Raid array entity of establishment is also the memory space (logical resource) that client can directly be accessed.
In this way to manage,, array entity and the unification of logical resource entity, data path is short, and performance is more excellent.Way to manage for logical resource and the unification of Raid array, logical resource is exactly a Raid array, a Raid array can only be formed based on a disk and build, although yet this administrative skill is relatively simplified, but there are some obvious technical problems in it: first, for the logical resource dilatation, no matter be dilatation on same disk group (disk space that is same Raid is not continuous distribution), still use different disk group dilatations, all need to additionally increase a virtualization layer on logical resource, realize complicated; The second, for the demand of AUTOMATIC ZONING, because the minimum particle size of logical resource management is exactly the Raid array, therefore can only move together by whole Raid array, the granularity of migration is too large.On this basis, a kind of improvement project is, logic-based resource division volume is realized the migration based on the son volume, this scheme refinement the granularity of migration, but need to increase sub-volume management layer on existing logical resource; Only divide in addition the son volume on existing logical resource, the free space unified management is not got up.In sum, at present the user is simple in the urgent need to a kind of way to manage, dilatation flexible and in the situation that the migration of AUTOMATIC ZONING data be easy to realize, the lower storage of hierarchically administrative skill of cost simultaneously.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of way to manage simple, dilatation flexible and in the situation that the migration of AUTOMATIC ZONING data be easy to realize, the lower storage of hierarchically administrative skill of cost simultaneously.The invention provides technical scheme for achieving the above object is:
A kind of management method of storage resources, it is applied in network store system, wherein said network store system comprises storage control and polylith disk, and use disk to create at least the first and second raid-arrays (Raid array), the front end port of described storage control connects main frame by network, and the rear end disk port of described storage control is connected with described disk; The method comprises:
A, respectively the free memory of above-mentioned the first and second Raid arrays is carried out piecemeal according to default resource block size, set up corresponding piece table for above-mentioned the first and second Raid arrays in described storage control, whether described table be occupied in order to each Resource Block that records above-mentioned Raid array, and the resource block size of wherein said the first and second Raid arrays is different;
B is that logical resource distributes at least one Resource Block when creating logical resource, and the Resource Block that will distribute to this logical resource in the piece table of the Raid array that logical resource takies is labeled as seizure condition;
C sets up the logical resource concordance list with the corresponding relation of the Resource Block that records logical resource and himself be assigned to and each resource block size that logical resource is assigned to for above-mentioned logical resource in described storage control;
D manages operation take Resource Block as unit to above-mentioned logical resource, and upgrades described table and logical resource concordance list after bookkeeping is completed.
Preferably, describedly take Resource Block as unit, logical resource is managed operation and be specially: be that take Resource Block as unit logical resource to be expanded distributes more Resource Block, and upgrade the piece table of the Raid array that is used for dilatation and the logical resource concordance list of described logical resource; On perhaps take Resource Block as unit, the data in logical resource being moved to a plurality of Resource Block on another Raid array from a Raid array, and upgrade piece table and the described logical resource concordance list of two Raid arrays.
Preferably, also comprise after described step D: E, carry out corresponding logical address to the mapping alter operation of physical address to bookkeeping.
Preferably, wherein a Raid array resource block size be the 2nd Raid array resource block size N doubly, wherein N is the natural number more than or equal to 2.
The present invention also provides a kind of network store system management devices, be used for carrying out the resource management action in network store system, wherein network store system comprises storage control and polylith disk, and use disk to create at least one raid-array (Raid array), the front end port of described storage control connects main frame by network, and the rear end disk port of described storage control is connected with described disk; This management devices comprises:
The Resource Block administrative unit, according to default resource block size respectively to described first and the free memory of the 2nd Raid array carry out piecemeal, set up corresponding piece table for the first and the 2nd Raid array in described storage control, whether described table be occupied in order to each Resource Block that records above-mentioned Raid array, and wherein the resource block size of a Raid array is different from the Resource Block of the 2nd Raid array;
The management initialization unit, be that logical resource distributes at least one Resource Block when creating logical resource, and the Resource Block that will distribute to this logical resource in the piece table of the Raid array that logical resource takies is labeled as seizure condition, and sets up the logical resource concordance list with the corresponding relation of the Resource Block that records logical resource and himself be assigned to and each resource block size that logical resource is assigned to for above-mentioned logical resource in described storage control;
The bookkeeping processing unit manages operation take Resource Block as unit to above-mentioned logical resource, and upgrades described table and logical resource concordance list after bookkeeping is completed.
Preferably, described bookkeeping processing unit manages operation take Resource Block as unit to logical resource and is specially: take Resource Block as the more Resource Block of logical resource distribution to be expanded as unit, and upgrade the piece table of the Raid array that is used for dilatation and the logical resource concordance list of described logical resource; On perhaps take Resource Block as unit, the data in logical resource being moved to a plurality of Resource Block on the 2nd Raid array from a Raid array, and upgrade piece table and the described logical resource concordance list of two Raid arrays.
Preferably, also comprise: the logical mappings unit is used for bookkeeping is carried out corresponding logical address to the mapping alter operation of physical address.
Preferably, the N of a wherein said Raid array resource block size and the 2nd Raid array resource block size times, wherein N is the natural number more than or equal to 2.
Description of drawings
Fig. 1 is existing segment management layer of structure figure.
Fig. 2 is the layer of structure figure of existing logical resource and Raid array unification way to manage.
Fig. 3 is network store system management devices building-block of logic of the present invention.
Fig. 4 is resource block assignments schematic diagram in network store system of the present invention.
Fig. 5 is another schematic diagram of resource block assignments in network store system of the present invention.
Fig. 6 is that logical resource of the present invention creates and the dilation process schematic diagram.
Fig. 7 is logical resource data migration schematic diagram of the present invention.
Embodiment
The present invention focuses on the administrative skill of storage resources, and it can solve the practical problem on SRM in prior art, can catch up with the application of layer and the seamless fusion of technology of bottom simultaneously.The better execution mode of the present invention is to adopt software engineering to realize, the mode of certainly not getting rid of some software and hardware combining or firmware realizes, introduces the typical handling process of the present invention below in conjunction with some examples.In the present invention if no special instructions, and storage system is network store system, and if not otherwise specified, memory space refers to memory space on logic level.
Please refer to Fig. 3, network store system management devices of the present invention moves in network store system and mainly comprises the following steps:
Step 101 utilizes a plurality of disks to create a Raid array and the 2nd Raid array in network store system; Please contrast Fig. 3, this step is carried out by array initialization unit 10 (also can be described as array management unit); Network store system comprises storage control and first and second raid-array (Raid array) at least in the present embodiment, the front end port of described storage control connects main frame by network, and the rear end port of described storage control is connected with each physical disk in described Raid array; The process that creates the Raid array can be with reference to existing Raid technology, and wherein the present invention does not have special requirement to the Raid rank, can be different, as long as the Raid module support in storage control.For dilatation, relate to a plurality of arrays; And for Data Migration, in general relate at least two arrays, and two exist one or more differences at least on reliability, cost or three kinds of parameters of access speed; Certainly may exist equally above-mentioned three parameters of a plurality of other arrays identical in storage system.Need explanation in the present invention, the same with prior art, during identical memory space that the Raid array of different stage provides to user or management level, the difference that needs on the verification expense of shielding different stage Raid array, that is to say that the disk space size that in fact takies is not identical, but this species diversity is invisible for logical resource bookkeeping or user's operation.
Step 102 is carried out piecemeal according to default resource block size to the available memory space of the above-mentioned first and the 2nd Raid array, sets up corresponding piece table 20 in described storage control, and whether described table be occupied in order to record each Resource Block; Wherein the Resource Block of the first and second Raid arrays varies in size.As preferred mode, the resource block size of two arrays presents the integral multiple relation, namely the resource block size of a Raid array be the 2nd Raid array resource block size N doubly, wherein N is the natural number more than or equal to 2.This step is carried out by Resource Block administrative unit 30.Here default resource block size, can be that the user passes through the configuration of Resource Block administrative unit, can be also the good default parameters of software configured in advance.Please refer to Fig. 4 and in conjunction with Fig. 5, system need to safeguard corresponding piece table for each Raid array that the array initialization unit provides, because piece is regular length, and distributing relevant characteristic due to each piece and resource is to have taken and vacant (namely idle), therefore can use the bitmap table on realizing, namely piece of a bit mark, can improve recall precision on the one hand, can save the space that the piece table takies on the other hand.Please refer to Fig. 5, such as the Raid array (array1) of a 64GB is divided into 64 according to the block size of 1GB, the piece table of array1 only needs the space of 8 bytes.Each bit position is that this Resource Block of expression of 1 is occupied, 0 expression do not have occupied.For another example the 2nd Raid array (array2) of a 32GB is divided into 64 according to the block size of 512M, equally perhaps the piece table of the 2nd Raid array needs the space of 8 bytes.Each bit position is that this Resource Block of expression of 1 is occupied, 0 expression do not have occupied.Yet the Resource Block of array1 and the resource block size of array2 can not present the relation of integral multiple, such as one be 1GB, and another is 500M, equally also can realize basic purpose of the present invention, only can introduce a small amount of fragment.
Step 103 is that LUN distributes at least one Resource Block when creating logical resource (LUN), and the Resource Block that will distribute to this logical resource in the piece table of the Raid array that logical resource takies is labeled as seizure condition;
Step 104 is after LUN creates, for each LUN sets up logical resource concordance list 40 with the corresponding relation of the Resource Block that records logical resource and himself be assigned to; Step 103 and step 104 are carried out by management initialization unit 50.
Please refer to Fig. 6, which Resource Block that front four lines in the logical resource concordance list has recorded a Raid array has been assigned to LUN1, take index marker A0B10 as example, the tenth Resource Block of its expression array1, be the third line the 3rd represented Resource Block in position from left to right in the piece table, go back mark in concordance list simultaneously this resource block size be 1GB.Although before Fig. 6, the situation shown in four lines is that all Resource Block corresponding to LUN1 are all in a Raid array.What be readily appreciated that is that the Resource Block that LUN1 is corresponding can be distributed in different Raid arrays.If distributed the Resource Block of the 2nd Raid array, need to carry out same record in the logical resource concordance list.
Step 105 manages operation take Resource Block as unit to logical resource, and upgrades described table and logical resource concordance list after bookkeeping is completed.
Step 105 is carried out by bookkeeping processing unit 60.Specifically, after Raid array block table and logic index table creation, can begin take Resource Block as unit, logical resource have been managed.The present invention describes as an example of the migration of most typical logical resource dilatation and logical resource data example.The more Resource Block of logical resource distribution to be expanded be need to be take Resource Block as unit for the logical resource dilatation, and the piece table of the Raid array that is used for dilatation and the logical resource concordance list of described logical resource upgraded; For Data Migration, take Resource Block as unit, the data in logical resource are moved on another Raid array from a Raid array equally, and upgrade piece table and the described logical resource concordance list of two Raid arrays.
No matter be logical resource dilatation or the migration of data, it follows the basic management process of the present invention, the management mode of operation take above-mentioned Resource Block as unit.
Please refer to equally Fig. 6, take the dilatation of logical resource as example:
Under preferred embodiment, when the dilatation demand is arranged, at first the bookkeeping processing unit will will judge whether the remaining free space of network store system satisfies the demand of dilatation in this step; If satisfy, continue to process; If do not satisfy, the prompting mistake; It is evident that, said free space refers to the free space of all Raid arrays here.
step I, capacity according to this dilatation needs increase, which Raid array of choice for use carries out dilatation, retrieve the bitmap table of selected Raid array, find free block (being unappropriated Resource Block), revise simultaneously the index area of logical resource, upgrade described table and logical resource concordance list, should again be labeled as for the Resource Block that is used and take, the mapping relations that need to increase logical resource and the Resource Block of selecting for the renewal of logical resource concordance list, because the resource block size of the first and second Raid arrays is not identical, foregoing such resource block size of selecting that also needs simultaneously to record.
Step II, repeating step I are until complete the demand of this dilatation.
What need supplementary notes is, the bookkeeping processing unit can be done some optimization processes in the process of carrying out dilatation, if such as find that there is continuous free block in certain Raid array, can be in a step a plurality of of dilatations simultaneously, optimization efficiency.Fig. 6 dotted portion is clear and expressed visually to the LUN1 dilatation 8GB, and the LU capacity is handed over from 16GB and is 24GB.
Please refer to Fig. 7, then take the Data Migration of logical resource as example:
As mentioned in background technology, in general the basis of AUTOMATIC ZONING is the IO statistics, the focus (i.e. the data of frequent access) and the cold spot (i.e. long-time data of not accessing) that find access according to default strategy or algorithm, then the strategy execution Data Migration preset of basis.Need to prove, statistics based on IO is the popular data hierarchy theory of industry, yet the user may not be the cold and hot of based on data for the layering of data, therefore performance statistics is only a kind of common Data Migration foundation, yet the user also can not carry out Data Migration based on this, because the user has control completely to data.Equally take piece as but this bookkeeping of the migration of following executing data, present embodiment bookkeeping performance element in step 105 need to be that unit carries out performance statistics according to piece, distinguish cold spot data and hot spot data, then be unit executing data migration according to Resource Block, the granularity of migration is less like this.Specifically in the trigger data migration: at first according to default strategy, find the target Raid array of migration; Such as can select readwrite performance and/or lower-cost Raid array as target Raid array for the cold spot data, and can select the higher Raid array of readwrite performance as target Raid array for hot spot data.
Then the bitmap of searched targets Raid array table, find free block, and this piece of mark is available, and is then fast to target from source piece synchrodata; The same with the dilatation example is, if there is continuous free block in target Raid array, can move simultaneously a plurality of, optimization efficiency.
After data are synchronously completed, upgrade described table and logical resource concordance list, be specially the piece table of modification source Raid array and target Raid array, the bitmap table of piece place, modification source Raid array, mark source piece is free block, just the space of this piece is discharged, and continues to use.Modify for the logical resource concordance list, use the target resource piece to replace the mapping relations of source Resource Block.Please refer to shown in Figure 7, according to statistics, the hot spot data of judgement LUN1 is A1B11 and A1B15, therefore these data of two is moved on the 2nd Raid array (Array2) first to the 4th Resource Block of corresponding A rray2 from a Raid array (Array1).Because the resource block size of the 2nd Raid array is 512M, only have half of a Raid array resource block size, therefore just need to use 4 Resource Block.Correspondingly, the logical resource concordance list need to correspond to these four Resource Block and carries out more new record corresponding relation and block size.The dotted portion of Fig. 7 has shown the process of Data Migration very visually, what need here to remark additionally is, in Fig. 7, the piece table of the 2nd Raid array is the expression mode of a breviary, only shows wherein four lines, and this is that appearance is intelligible to those skilled in the art.The processing of Data Migration is except synchrodata, only need to revise mark in the bitmap table and the index area of logical resource, do not introduce fragment, do not introduce new management entity yet, can realize according to the performance statistic of network store system and default strategy the relative succinct and relatively uniform management of memory space in whole network store system.
The same with existing administrative skill, bookkeeping can trigger the logical mappings operation of bottom more, and corresponding logical address all can be carried out to the mapping alter operation of physical address for bookkeeping in the logical mappings unit 70 of general network store system.Such as when migration occured data, logical address need to change to the mapping of physical address so that the process of Data Migration be sightless for main frame on network, do not affect user's normal read-write operation.
The above only is the better implementation of the present invention, and any modification that is equal to of making based on spirit of the present invention all should be covered by in claim scope of the present invention.
Claims (8)
1. the management method of a storage resources, it is applied in network store system, wherein said network store system comprises storage control and polylith disk, and use described polylith disk to create at least the first and second raid-array Raid arrays, the front end port of described storage control connects main frame by network, and the rear end disk port of described storage control is connected with described disk; It is characterized in that, the method comprises:
A, respectively the free memory of above-mentioned the first and second Raid arrays is carried out piecemeal according to default resource block size, set up corresponding piece table for above-mentioned the first and second Raid arrays in described storage control, whether described table be occupied in order to each Resource Block that records above-mentioned Raid array, and the resource block size of wherein said the first and second Raid arrays is different;
B is that logical resource distributes at least one Resource Block when creating logical resource, and the Resource Block that will distribute to this logical resource in the piece table of the Raid array that logical resource takies is labeled as seizure condition;
C sets up the logical resource concordance list with the corresponding relation of the Resource Block that records logical resource and himself be assigned to and each resource block size that logical resource is assigned to for above-mentioned logical resource in described storage control;
D manages operation take Resource Block as unit to above-mentioned logical resource, and upgrades described table and logical resource concordance list after bookkeeping is completed.
2. method described according to claim l, it is characterized in that, describedly take Resource Block as unit, logical resource is managed operation and be specially: be that take Resource Block as unit logical resource to be expanded distributes more Resource Block, and upgrade the piece table of the Raid array that is used for dilatation and the logical resource concordance list of described logical resource; On perhaps take Resource Block as unit, the data in logical resource being moved to a plurality of Resource Block on another Raid array from a Raid array, and upgrade piece table and the described logical resource concordance list of two Raid arrays.
3. method according to claim 1, is characterized in that, also comprises after described step D: E, carry out corresponding logical address to the mapping alter operation of physical address to bookkeeping.
4. according to claim 1-3 described methods of any one, is characterized in that, wherein a Raid array resource block size be the 2nd Raid array resource block size N doubly, wherein N is the natural number more than or equal to 2.
5. network store system management devices, be used for carrying out the resource management action in network store system, wherein network store system comprises storage control and polylith disk, and use described polylith disk to create first and second raid-array Raid array at least, the front end port of described storage control connects main frame by network, and the rear end disk port of described storage control is connected with described disk; It is characterized in that, this management devices comprises:
The Resource Block administrative unit, according to default resource block size respectively to described first and the free memory of the 2nd Raid array carry out piecemeal, set up corresponding piece table for the first and the 2nd Raid array in described storage control, whether described table be occupied in order to each Resource Block that records above-mentioned Raid array, and wherein the resource block size of a Raid array is different from the Resource Block of the 2nd Raid array;
The management initialization unit, be that logical resource distributes at least one Resource Block when creating logical resource, and the Resource Block that will distribute to this logical resource in the piece table of the Raid array that logical resource takies is labeled as seizure condition, and sets up the logical resource concordance list with the corresponding relation of the Resource Block that records logical resource and himself be assigned to and each resource block size that logical resource is assigned to for above-mentioned logical resource in described storage control;
The bookkeeping processing unit manages operation take Resource Block as unit to above-mentioned logical resource, and upgrades described table and logical resource concordance list after bookkeeping is completed.
6. management devices according to claim 5, it is characterized in that, described bookkeeping processing unit manages operation take Resource Block as unit to logical resource and is specially: take Resource Block as the more Resource Block of logical resource distribution to be expanded as unit, and upgrade the piece table of the Raid array that is used for dilatation and the logical resource concordance list of described logical resource; On perhaps take Resource Block as unit, the data in logical resource being moved to a plurality of Resource Block on the 2nd Raid array from a Raid array, and upgrade piece table and the described logical resource concordance list of two Raid arrays.
7. management devices according to claim 5, is characterized in that, also comprises: the logical mappings unit is used for bookkeeping is carried out corresponding logical address to the mapping alter operation of physical address.
8. according to claim 5-7 described management devices of any one, is characterized in that, the N of a wherein said Raid array resource block size and the 2nd Raid array resource block size times, wherein N is the natural number more than or equal to 2.
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| CN103823641B (en) * | 2014-03-13 | 2017-01-04 | 深圳市迪菲特科技股份有限公司 | The virtual volume system of a kind of on-line rapid estimation and its implementation |
| CN107203329B (en) | 2016-03-17 | 2020-12-01 | 伊姆西Ip控股有限责任公司 | Storage management method and equipment |
| CN107122136B (en) * | 2017-04-25 | 2021-02-02 | 浙江宇视科技有限公司 | Capacity obtaining method and device |
| CN112286446B (en) * | 2020-09-17 | 2022-12-20 | 杭州华澜微电子股份有限公司 | Storage device and control method thereof |
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| CN101604226A (en) * | 2009-07-14 | 2009-12-16 | 浪潮电子信息产业股份有限公司 | A kind of method that makes up raising performance of storage system in dynamic buffering pond based on virtual RAID |
| CN101840308A (en) * | 2009-10-28 | 2010-09-22 | 创新科存储技术有限公司 | Hierarchical memory system and logical volume management method thereof |
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