CN107704206B - Method, device, equipment and storage medium for online migration of heterogeneous system data - Google Patents
Method, device, equipment and storage medium for online migration of heterogeneous system data Download PDFInfo
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- 238000013508 migration Methods 0.000 title claims abstract description 31
- 230000005012 migration Effects 0.000 title claims abstract description 31
- 238000013507 mapping Methods 0.000 claims abstract description 22
- 238000004590 computer program Methods 0.000 claims description 10
- 239000003999 initiator Substances 0.000 claims description 6
- 238000012986 modification Methods 0.000 claims description 4
- 230000004048 modification Effects 0.000 claims description 4
- 239000000725 suspension Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0646—Horizontal data movement in storage systems, i.e. moving data in between storage devices or systems
- G06F3/0647—Migration mechanisms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0614—Improving the reliability of storage systems
Abstract
The application discloses a method, a device, equipment and a storage medium for online migration of heterogeneous system data, wherein the method comprises the steps of connecting a new storage system to an original storage system and acquiring equipment information of the original storage system; mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system; setting a link between the new storage system and the host computer as an active link, and realizing online link takeover and switching between the original storage system and the host computer by using the new storage system; and migrating the data in the original storage system to the new storage system on line. The method, the device, the equipment and the storage medium for online migrating the data of the heterogeneous system support online takeover of the access of the host and the heterogeneous storage system, realize online takeover and migration, avoid storage service suspension and improve service continuity.
Description
Technical Field
The invention belongs to the technical field of storage equipment, and particularly relates to a method, a device, equipment and a storage medium for online migration of heterogeneous system data.
Background
The SAN storage system is commonly adopted in the current computer storage system, and supports the block devices and the storage service provided by connecting a host server through networks such as FC, IP and the like, and the characteristic supports the expansion of more block devices and capacities by increasing network connection and storage systems. A computing and storage business system will generate the need to expand storage capacity, performance and functionality as traffic increases, as well as eliminate or replace older storage systems. Migration and replacement of uninterrupted data services is generally not supported for old and new storage systems that are heterogeneous systems, i.e., systems of different vendors or different architectures of the same vendor, for the following reasons: in terms of protocols, SAN storage realizes protocol clusters such as an FCP/IP communication layer, an SPC (SCSI Primary Command), an SBC (SCSI Block Command) and the like, and at a host server end, a method for identifying a SCSI Block device is to inquire the ID of the Block device by sending an INQUIRY command, the same SCSI Block device can be accessed through different FC and IP links, and whether the SCSI Block device is a plurality of paths of the same device or not is identified through the ID of the Block device. In order to avoid host-side misidentification and use caused by the fact that SCSI device IDs provided by different manufacturers and the same manufacturer are the same, the SCSI protocol requires that the system is implemented to ensure that the ID of each SCSI block device provided by each storage system is globally unique, which causes the SCSI block device IDs provided by two different storage systems to be different, and the host-side can identify different block devices and cannot switch read-write access online and transparently.
The existing common method for migrating data of a heterogeneous storage system is as follows: the service is stopped, then the new storage system is connected, the replaced and stored data is copied from the host end to the new storage system, and finally the service is switched and recovered. For a new storage system supporting the 3 rd party virtualization function, the method is as follows: the service is stopped firstly, then the connection between the host and the old storage system is disconnected, the new storage system is connected with the old storage system, the volume of the old storage system is managed and mapped to the host, and the host is connected with the new storage system to recover the service. It can be seen that the above approaches all involve suspension and interruption of host traffic.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method, an apparatus, a device, and a storage medium for online migrating heterogeneous system data, which support online takeover of access between a host and a heterogeneous storage system, implement online takeover and migration, avoid storage service suspension, and improve service continuity.
The method for migrating the data of the heterogeneous system on line provided by the invention comprises the following steps:
connecting a new storage system to an original storage system, and acquiring equipment information of the original storage system;
mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system;
setting a link between the new storage system and the host computer as an active link, and realizing online link takeover and switching between the original storage system and the host computer by using the new storage system;
and migrating the data in the original storage system to the new storage system on line.
Preferably, in the method for migrating data of a heterogeneous system online, the connecting the new storage system to the original storage system, and acquiring the device information of the original storage system includes:
the new storage system connects and logs in the original storage system in a SCSI Initiator mode, and queries LUN list, manufacturer, product ID, logic unit ID and CAPACITY information of the original storage system through REPORT LUN, INQUIRY and READ _ CAPACITY commands.
Preferably, in the method for migrating data of a heterogeneous system online, mapping the new storage system to the host in the SCSITarget mode according to the same device information as the original storage system is:
and creating a virtual SCSI block device in the new storage system, and mapping the virtual SCSI block device to the host in an SCSI Target mode according to the same logical unit ID, manufacturer, product ID and capacity information as the original storage system.
Preferably, in the method for migrating data of a heterogeneous system online, after the data in the original storage system is migrated to the new storage system online, the method includes:
and when the service is suspended, modifying the manufacturer, the product ID, the logic unit ID and the capacity information of the new storage system to default values, and recovering the service of the host.
The device for migrating the data of the heterogeneous system on line provided by the invention comprises the following components:
the device information acquisition unit is used for connecting the new storage system to the original storage system and acquiring the device information of the original storage system;
the mapping unit is used for mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system;
a setting unit, configured to set a link between the new storage system and the host as an active link, and implement online link takeover and switching between the original storage system and the host by using the new storage system;
and the migration unit is used for migrating the data in the original storage system to the new storage system on line.
Preferably, in the above apparatus for migrating heterogeneous system data online, the device information obtaining unit is specifically configured to connect and log the new storage system to the original storage system in a SCSI Initiator mode, and query a LUN list, a manufacturer, a product ID, a logical unit ID, and CAPACITY information of the original storage system through report, INQUIRY, and READ _ capability commands.
Preferably, in the apparatus for migrating heterogeneous system data online, the mapping unit is specifically configured to create a virtual SCSI block device in the new storage system, and map the virtual SCSI block device to the host in an SCSI Target mode according to the same logical unit ID, vendor, product ID, and capacity information as the original storage system.
Preferably, the apparatus for migrating data of a heterogeneous system online further includes:
and the modification unit is used for modifying the manufacturer, the product ID, the logic unit ID and the capacity information of the new storage system to default values when the service is suspended, and recovering the service of the host.
The invention provides a device for migrating heterogeneous system data on line, which comprises:
a memory for storing a computer program;
a processor configured to implement the steps of the method for online migration of heterogeneous system data according to any one of the above when the computer program is executed.
The invention provides a storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for online migrating heterogeneous system data according to any one of the above.
As can be seen from the above description, according to the method, the apparatus, the device and the storage medium for online migrating heterogeneous system data provided by the present invention, the method includes connecting a new storage system to an original storage system, and acquiring device information of the original storage system; mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system; setting a link between the new storage system and the host computer as an active link, and realizing online link takeover and switching between the original storage system and the host computer by using the new storage system; the data in the original storage system is migrated to the new storage system on line, so that the method, the device, the equipment and the storage medium for migrating the data of the heterogeneous system on line support the access of a host and the heterogeneous storage system to be taken over on line, the on-line taking over and migration are realized, the storage service is prevented from being suspended, and the continuity of the service is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a first method for online migrating data of a heterogeneous system according to an embodiment of the present application;
fig. 2 is a schematic diagram of a first apparatus for online migrating data of a heterogeneous system according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of an apparatus for migrating heterogeneous system data online according to an embodiment of the present disclosure.
Detailed Description
The core idea of the invention is to provide a method, a device, equipment and a storage medium for online migration of heterogeneous system data, which support online takeover of access between a host and a heterogeneous storage system, realize online takeover and migration, avoid storage service suspension and improve service continuity.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows a first method for online migrating heterogeneous system data provided in an embodiment of the present application, where fig. 1 is a schematic diagram of the first method for online migrating heterogeneous system data provided in the embodiment of the present application, and the method includes the following steps:
s1: connecting a new storage system to an original storage system, and acquiring equipment information of the original storage system;
it should be noted that, at this time, the original storage system is not disconnected from the host, and the data transfer between the original storage system and the host is still maintained, but the steps include, but are not limited to, querying LUN information through a REPORT LUN command, querying vendor and product ID information through an INQUIRY command, and querying CAPACITY information through a READ _ capability command.
S2: mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system;
just because the IDs of the new storage system and the original storage system are the same, the host does not identify the new storage system and the original storage system as different storage systems, and therefore the online data migration is possible.
S3: setting a link between the new storage system and the host computer as an active link, and realizing online link takeover and switching between the original storage system and the host computer by using the new storage system;
in this case, the new storage system supports the same target port group attribute of the original storage system, which is queried through the TPGS field (target port group support) returned by the INQUIRY command result, which includes: 0 indicates that ALUA access property 00b is not supported, 1 indicates that implicit ALUA property (implicit asynchronous local access) is supported, 2 indicates that explicit ALUA property (explicit asynchronous local access) is supported, and 3 indicates that both implicit and explicit ALUA properties are supported. The new storage system issues the read-write command from the host to the original storage system, namely, the actual data is read from the original storage system, and then the data and the result are responded to the host. For the case where the TARGET PORT group policy is implicit ALUA, the new storage system sets the PORTs to be preferred and active and optimized when responding to the host's REPORT TARGET PORT group command, i.e., the value of the preferred TARGET PORT (PREF) field is 1 and the value of the ASYMMETRIC ACCESS STATE field is 0, which ensures that the host reads and writes through the path of the new storage system. After the host establishes a link for reading and writing through the new storage system, the link between the original storage system and the host is disconnected, so that online switching is realized, and specifically, the mapping mode of SCSI block equipment with the host is deleted from the original storage system, or a special FC link with the host is disconnected.
S4: and migrating the data in the original storage system to the new storage system on line.
It should be noted that, exactly in the above steps, online takeover of the new storage system and transfer of IO of the original storage system are realized, so online data migration can be realized, and the online migration process is the same as that in the prior art and is not described herein again.
As can be seen from the above description, the first method for migrating data of a heterogeneous system online according to the embodiment of the present application includes connecting a new storage system to an original storage system, and acquiring device information of the original storage system; mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system; setting a link between the new storage system and the host computer as an active link, and realizing online link takeover and switching between the original storage system and the host computer by using the new storage system; the data in the original storage system is migrated to the new storage system on line, so that the method, the device, the equipment and the storage medium for migrating the data of the heterogeneous system on line support the access of a host and the heterogeneous storage system to be taken over on line, the on-line taking over and migration are realized, the storage service is prevented from being suspended, and the continuity of the service is improved.
The second method for migrating heterogeneous system data online provided in the embodiment of the present application is based on the first method for migrating heterogeneous system data online, and further includes the following technical features:
connecting the new storage system to the original storage system, and acquiring the device information of the original storage system:
the new storage system connects and logs in the original storage system in a SCSI Initiator mode, and queries LUN list, manufacturer, product ID, logic unit ID and CAPACITY information of the original storage system through REPORT LUN, INQUIRY and READ _ CAPACITY commands.
The third method for online migrating heterogeneous system data provided in the embodiment of the present application is based on the second method for online migrating heterogeneous system data, and further includes the following technical features:
the mapping of the new storage system to the host in the SCSI Target mode according to the same device information as the original storage system is as follows:
and creating a virtual SCSI block device in the new storage system, and mapping the virtual SCSI block device to the host in an SCSI Target mode according to the same logical unit ID, manufacturer, product ID and capacity information as the original storage system.
In this case, the multipath software of the host queries the LUN provided by the new storage system, and obtains information of manufacturer, product model, logical unit ID, CAPACITY, etc. through REPORT _ LUN, INQUIRY, and READ _ capability, and these factors make the multipath software of the host think it is a new path of a block device with the same logical unit ID as that in the original storage system, thereby implementing online data migration.
The fourth method for online migrating heterogeneous system data provided in the embodiment of the present application is based on any one of the first to third methods for online migrating heterogeneous system data, and further includes the following technical features:
after the online migration of the data in the original storage system to the new storage system, the method includes:
and when the service is suspended, modifying the manufacturer, the product ID, the logic unit ID and the capacity information of the new storage system to default values, and recovering the service of the host.
Specifically, after the data migration from the original storage system to the new storage system is completed, under the condition that the service is allowed to be suspended, the new storage system can modify the manufacturer, the product model and the logical unit ID of the block device, recover to the default values, and then recover the host service, and the new storage system can be disconnected from the original storage system after the data migration is completed.
Fig. 2 shows a first apparatus for online migrating heterogeneous system data provided in an embodiment of the present application, where fig. 2 is a schematic diagram of the first apparatus for online migrating heterogeneous system data provided in the embodiment of the present application, and the apparatus includes:
an equipment information obtaining unit 201, configured to connect a new storage system to an original storage system, and obtain equipment information of the original storage system, where it is to be noted that, at this time, connection between the original storage system and a host is not disconnected, data transmission between the original storage system and the host is still maintained, where the LUN information is queried through a REPORT LUN command, vendor and product ID information is queried through an INQUIRY command, and CAPACITY information is queried through a READ _ capability command;
the mapping unit 202 is configured to map the new storage system to the host in an SCSI Target mode according to the same device information as the original storage system, and since the IDs of the new storage system and the original storage system are the same, the host does not identify the new storage system and the original storage system as different storage systems, so that implementation of online data migration is possible;
a setting unit 203, configured to set the link between the new storage system and the host as an active link, and implement online link takeover and switching between the original storage system and the host by using the new storage system, in which case, the new storage system supports the same target port group attribute of the original storage system, which is queried through a TPGS field (target port group support) returned by an INQUIRY command result, which includes: 0 indicates that the ALUA access property 00b is not supported, 1 indicates that the implicit ALUA property (implicit asynchronous local unit access) is supported, 2 indicates that the explicit ALUA property (explicit asynchronous local unit access) is supported, and 3 indicates that both the implicit and explicit ALUA properties are supported. The new storage system issues the read-write command from the host to the original storage system, namely, the actual data is read from the original storage system, and then the data and the result are responded to the host. For the case where the TARGET PORT group policy is implicit ALUA, the new storage system sets the PORTs to be preferred and active and optimized when responding to the host's REPORT TARGET PORT group command, i.e., the value of the preferred TARGET PORT (PREF) field is 1 and the value of the ASYMMETRIC ACCESS STATE field is 0, which ensures that the host reads and writes through the path of the new storage system. After the host establishes a link for reading and writing through the new storage system, the link between the original storage system and the host is disconnected, so that online switching is realized, and specifically, the SCSI block device mapping mode with the host can be deleted from the original storage system, or a special FC link with the host is disconnected;
the migration unit 204 is configured to migrate the data in the original storage system to the new storage system on line, and it should be noted that, just as online takeover of the new storage system and transfer of IO of the original storage system are achieved, online migration of the data can be achieved.
The second device for online migrating heterogeneous system data provided in the embodiment of the present application is based on the first device for online migrating heterogeneous system data, and further includes the following technical features:
the device information obtaining unit is specifically configured to connect and log the new storage system to the original storage system in a SCSI Initiator mode, and query a LUN list, a manufacturer, a product ID, a logical unit ID, and CAPACITY information of the original storage system through REPORT LUN, INQUIRY, and READ _ capability commands.
The third apparatus for online migrating heterogeneous system data provided in the embodiment of the present application is based on the second apparatus for online migrating heterogeneous system data, and further includes the following technical features:
the mapping unit is specifically configured to create a virtual SCSI block device in the new storage system, and map the SCSI block device to the host in an SCSITarget mode according to the same logical unit ID, vendor, product ID, and capacity information as the original storage system.
In this case, the multipath software of the host queries the LUN provided by the new storage system, and obtains information of manufacturer, product model, logical unit ID, CAPACITY, etc. through REPORT _ LUN, INQUIRY, and READ _ capability, and these factors make the multipath software of the host think it is a new path of a block device with the same logical unit ID as that in the original storage system, thereby implementing online data migration.
The fourth device for online migrating heterogeneous system data provided in the embodiment of the present application is based on any one of the first to third devices for online migrating heterogeneous system data, and further includes the following technical features:
further comprising:
and the modification unit is used for modifying the manufacturer, the product ID, the logic unit ID and the capacity information of the new storage system to default values when the service is suspended, and recovering the service of the host.
Specifically, after the data migration from the original storage system to the new storage system is completed, under the condition that the service is allowed to be suspended, the new storage system can modify the manufacturer, the product model and the logical unit ID of the block device, recover to the default values, and then recover the host service, and the new storage system can be disconnected from the original storage system after the data migration is completed.
Fig. 3 shows an apparatus for migrating heterogeneous system data online according to an embodiment of the present application, where fig. 3 is a schematic diagram of the apparatus for migrating heterogeneous system data online according to the embodiment of the present application, and the apparatus includes:
a memory 301 for storing a computer program;
a processor 302 for implementing the steps of the method for online migrating heterogeneous system data according to any one of the above when executing the computer program.
In addition to the above memory and processor, a host adapter card, such as a network card, a Fibre Channel card, etc., is included for connecting to a third-party storage system and to a host server.
A storage medium is provided in an embodiment of the present application, and the storage medium stores a computer program, and the computer program, when executed by a processor, implements the steps of the method for migrating heterogeneous system data online according to any one of the above.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The method for migrating the data of the heterogeneous system on line is characterized by comprising the following steps:
connecting a new storage system to an original storage system, and acquiring equipment information of the original storage system;
mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system;
setting a link between the new storage system and the host computer as an active link, and realizing online link takeover and switching between the original storage system and the host computer by using the new storage system;
online migrating the data in the original storage system to the new storage system;
connecting the new storage system to the original storage system, and acquiring the device information of the original storage system:
the new storage system connects and logs in the original storage system in a SCSI Initiator mode, and queries LUN list, manufacturer, product ID, logic unit ID and CAPACITY information of the original storage system through REPORTLUN, INQUIRY and READ _ CAPACITY commands.
2. The method for migrating heterogeneous system data online according to claim 1, wherein the mapping the new storage system to the host in the SCSI Target mode according to the same device information as the original storage system is:
and creating a virtual SCSI block device in the new storage system, and mapping the virtual SCSI block device to the host in an SCSI Target mode according to the same logical unit ID, manufacturer, product ID and capacity information as the original storage system.
3. The method for online migrating heterogeneous system data according to any one of claims 1-2, wherein after the online migration of the data in the original storage system to the new storage system, the method includes:
and when the service is suspended, modifying the manufacturer, the product ID, the logic unit ID and the capacity information of the new storage system to default values, and recovering the service of the host.
4. An apparatus for online migration of data in a heterogeneous system, comprising:
the device information acquisition unit is used for connecting the new storage system to the original storage system and acquiring the device information of the original storage system;
the mapping unit is used for mapping the new storage system to a host in an SCSI Target mode according to the same equipment information as the original storage system;
a setting unit, configured to set a link between the new storage system and the host as an active link, and implement online link takeover and switching between the original storage system and the host by using the new storage system;
the migration unit is used for migrating the data in the original storage system to the new storage system on line;
the device information obtaining unit is specifically configured to connect and log the new storage system to the original storage system in a SCSI Initiator mode, and query a LUN list, a manufacturer, a product ID, a logical unit ID, and CAPACITY information of the original storage system through REPORT LUN, INQUIRY, and READ _ capability commands.
5. The apparatus for online migrating heterogeneous system data according to claim 4, wherein the mapping unit is specifically configured to create a virtual SCSI block device in the new storage system, and map the virtual SCSI block device to the host in an SCSI Target mode according to the same logical unit ID, vendor, product ID, and capacity information as the original storage system.
6. The apparatus for online migrating heterogeneous system data according to any one of claims 4-5, further comprising:
and the modification unit is used for modifying the manufacturer, the product ID, the logic unit ID and the capacity information of the new storage system to default values when the service is suspended, and recovering the service of the host.
7. An apparatus for online migration of data of a heterogeneous system, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the method for online migration of heterogeneous system data according to any one of claims 1 to 3 when executing the computer program.
8. A storage medium having stored thereon a computer program which, when executed by a processor, carries out the steps of the method of online migrating heterogeneous system data according to any of claims 1 to 3.
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| CN109189324B (en) | 2018-07-09 | 2021-01-08 | 华为技术有限公司 | Data migration method and device |
| CN112558881A (en) * | 2020-12-18 | 2021-03-26 | 上海七牛信息技术有限公司 | Method and system for migrating storage system |
| CN112732195B (en) * | 2021-01-13 | 2022-09-20 | 苏州浪潮智能科技有限公司 | Method, system, equipment and medium for online takeover of heterogeneous storage volume |
| CN117270792A (en) * | 2023-11-20 | 2023-12-22 | 苏州元脑智能科技有限公司 | Data migration method, device, equipment and storage medium |
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