IBMV系统存储hyperswap实施手册(英文).doc

1、IBM V 系统存储hyperswap 实施手册专业资料文档信息 (文档编号 IBM SVC-70)文挡名称作者QQIBM V 系统存储hyperswap实施手册朱亚铭13951968365150111099文档修订记录编号修订容简述修订日期修订前版本号V1.0整体文档的编写2016.12.23注：技术交流ymzhu2005163.专业资料一 、 ConfiguringanIBMHyperSwaptopology systemA HyperSwap ? topology system assists with high availability and site disasterrecover

2、y. A HyperSwap topology system can be configured through siteallocation and topology change command-line (CLI) commands. Themanagement GUI configures a HyperSwap topology with the Modify SystemTopology wizard, which guides you through all the steps easily.1.1 About this taskTo access the Modify Syst

3、em Topology wizard, select Monitoring System. Inthe Actions menu, select Modify System Topology.? Configuring site information for the systemTo configure a HyperSwap system topology, you must assign enclosures, external storage systems, and hosts to a specific site.? Creating HyperSwap volumesYou ca

4、n use the management GUI or the command-line interface (CLI) to create HyperSwap volumes. A HyperSwap volume has one copy on each site.? Converting an existing volume to a HyperSwap volumeYou can use the management GUI or the command-line interface to专业资料convert a basic volume to a HyperSwap volume.

5、 You convert the basicvolume by adding another copy of the volume in a second site.二、 Configuringsite informationforthesystemTo configure a HyperSwap ? system topology, you must assign enclosures,external storage systems, and hosts to a specific site.2.1 Using the management GUIYou can use the Modif

6、y System Topology wizard in the management GUI toeasily configure the site names and assign objects on your system to a site. TheModify Topology wizard automatically detects any Fibre Channel-attachedstorage, but iSCSI storage must be added manually before the site assignmentscan be configured. You

7、can use either the management GUI or thecommand-line interface to add Storwize systems. Dell EqualLogfic systems canbe configured with the command-line interface only. Complete the followingsteps to configure the topology for the system and to optionally addiSCSI-attached storage:1. In the managemen

8、t GUI, select Monitoring System. In the Actions menu, select Modify System Topology.专业资料2. Follow the wizard to complete the configuration of the HyperSwap topology.3. If you are using iSCSI-attached external storage, you must add the storage to the system and specify the site using the Add iSCSI Ex

9、ternal Storage wizard. To access the wizard, select Pools External Storage Add iSCSI External Storage.4. Select IBM Storwize as the external storage system that you are adding. The system supports iSCSI connections to Storwize family products and to Dell Equallogic systems, but you must configure De

10、ll EqualLogic systems with the command-line interface.5. Enter the information for the source and target ports for the iSCSI connection and specify the site for the iSCSI-attached storage.2.2 Using the CLIYou can also use the command-line interface to configure site information andconfigure the syst

11、em as a HyperSwap topology. Separate commands are usedfor each configuring site definitions for the necessary objects on the system.Although you do not need to name sites, creating names that are based on thelocation or use of the site simplifies management of the HyperSwap topology.Complete the fol

12、lowing steps to configure site information and set the system asa HyperSwap topology:专业资料1. For easier management of the HyperSwap topology, create specific names for each site on the system. If names are not specified, sites can be referred to by their default name or numeric ID. Enter the followin

13、g command to create specific names for each site.chsite -name losangeles 1In this example, site 1 is now named losangeles. To rename the other sites in the HyperSwap topology, issue the same command with names for the other sites:chsite -name sandiego 2 chsite -name quorum 3In this example, site 2 i

14、s now named sandiego and site 3 is named quorum .Note: IP quorum applications can be used at a third site to provide atie-break if there is a loss of connectivity between site1 and site 2. Formore information, see the IP quorum configuration information.2. Enter the following commands to assign exis

15、ting node canisters in each control enclosure (I/O group) to sites:chnodecanister -site losangeles canister1 chnodecanister -site losangeles canister2专业资料Both node canisters in a control enclosure must be assigned to the samesite. In this example, the I/O group that containscanister1 and canister2ar

16、e assigned to the site losangeles. To assign the node canisters in anotherI/O group to the other site, enter the following commands:chnodecanister -site sandiego canister3chnodecanister -site sandiego canister4In this example, the I/O group that containscanister3 and canister4 areassigned to the sit

17、e sandiego. You must assign a site for all node canistersin the system.3. Enter the following command to assign existing external storage systems to sites:chcontroller site losangeles storagesystem1In this example, storagesystem1 is assigned to site losangeles. To assign a storage system to the othe

18、r site, enter the following command:chcontroller site sandiego storagesystem2In this example, storagesystem2 is assigned to site sandiego.If you plan to use an external storage system to provide quorum, then you must assign that to the third site. Alternatively, an IP quorum application can be used

19、to provide quorum. For more information, see专业资料the IP quorum configuration information. To assign an external storagesystem to the third site, enter the following command:chcontroller site quorum storagesystem3In this example, storagesystem3 is assigned to site quorum .You must assign a site for al

20、l storage systems that are present in theconfiguration.4. Enter the following command to assign existing hosts to sites: chhost -site losangeles host1In this example, host1 is assigned to site losangeles. If you have other hosts, you can assign them to other sites:chhost -site sandiego host2In this

21、example, host2 is assigned to site sandiego.5. After all the site assignments are complete for enclosures, storage systems, and hosts, set the system topology to HyperSwap by entering the following command:chsystem -topology hyperswap专业资料6. Optionally, configure bandwidth settings for the background

22、 copy operations between each site by entering the following command:chpartnership -linkbandwidthmbits 2048 -backgroundcopyrate 50 mysystemBackground copy is the term that is used for the initial synchronizationand any subsequent resynchronization traffic for HyperSwap volumes inthe system.After you

23、 complete these steps, you can configure HyperSwap volumes to createcopies at each site.2.3 Configuring an external iSCSI controller using the CLIAfter you change the system topology to hyperswap and nodes are assigned sites,you can configure an external iSCSI controller by completing the following

24、steps.1. From the nodes of site 1, discover the iSCSI target controller:2. detectiscsistorageportcandidate srcportid 1-targetip IP1 -site 13. Check the status of the discovered targets:4. lsiscsistorageportcandidate id src_port_id target_ipv4 | target_ipv65. target_iscsiname iogroup_list configured

25、statussite_id site_name 0 1 IP1 IQN1 1:1:1:1 no Full 1 site1专业资料6. From the nodes of site 1, add a session to the discovered targets: addiscsitorageport -site 1 07. From the nodes of site 1, view the established sessions with the target:8. id src_port_id target_ipv4 | target_ipv6 target_iscsiname9.

26、controller_id iogroup_list status site_id site_name0 3 IP1 IQN1 5 1:1:1:1 full 1 site110. The new controller can be shown as available by entering the lscontroller command. Assign a site:chcontroller -site 1 controllerID11. From the system nodes of site 2, repeat steps 1 through 5 for discovering an

27、d establishing sessions to the same iSCSI controller or a different iSCSI controller.三、 Creating HyperSwap volumesYou can use the management GUI or the command-line interface (CLI) to createHyperSwap ? volumes. A HyperSwap volume has one copy on each site.专业资料3.1 Before you beginBefore you create Hy

28、perSwap volumes, you must configure the HyperSwaptopology. See Configuring site information for the systemfor directions.3.2 About this taskAfter you configure the HyperSwap topology, complete one of the followingsteps.3.3 Procedure1. If you are using the management GUI, use the Create Volumes wizar

29、d to create HyperSwap volumes.2. If you are using the command-line interface, use the mkvolume command to create a volume. For example, a HyperSwap volume is created by specifying two storage pools in independent sites.mkvolume -size 100 -pool site1pool:site2pool四、 Convertingan existingvolumetoaHype

30、rSwap volumeYou can use the management GUI or the command-line interface to convert abasic volume to a HyperSwap ? volume. You convert the basic volume byadding another copy of the volume in a second site.专业资料4.1 Before you beginBefore you add a copy of the volume, the system must be configured with

31、 the HyperSwap system topology.4.2 About this taskUsing the management GUI:To change a basic volume to a HyperSwap volume in the management GUI,select Volumes, right-click the basic volume, and select Add Volume Copies. Adda copy in a different site to the existing copy.Using the command-line interf

32、ace (CLI):In the CLI, the addvolumecopycommandadds a copy to a HyperSwapvolume,whichchanges a basic volumeinto a HyperSwapvolume withcopies on twoseparate sites. Toadd a copy to a basic volume to convert it to aHyperSwap volume, enter the followingcommand:addvolumecopy -pool site2pool volume5In this

33、 example, site2pool is the storage pool on the other site.A quorum disk is an MDisk or a managed drive that contains a reserved area thatis used exclusively for system management.A system uses a quorum disk for two purposes:? To break a tie when a SAN fault occurs, when exactly half of the nodes tha

34、t were previously a member of the system are present.专业资料? To hold a copy of important system configuration data. Just over 256 MB is reserved for this purpose on each quorum disk candidate.? Quorum disk configurationA clustered system automatically assigns quorum disk candidates. When you add new s

35、torage to a system or remove existing storage, however, it is a good practice to review the quorum disk assignments.? IP quorum configurationIn some HyperSwap ? configurations, IP quorum applications can be used at the third site as an alternative to third-site quorum disks.? Manual quorum disk over

36、ride in a HyperSwap systemA manual quorum disk override is required when you experience a rolling disaster. In rare situations, the system is subject to what is referred to as a rolling disaster . A rolling disaster occurs when an incident has wide scope, and its effects are felt in multiple steps o

37、ver an extended time period. The following example scenario describes a rolling disaster and shows how to recover from that rolling disaster.专业资料五、 Quorum disk configurationA clustered system automatically assigns quorum disk candidates. When you addnew storage to a system or remove existing storage

38、, however, it is a goodpractice to review the quorum disk assignments.It is possible for a system to split into two groups where each group contains halfthe original number of nodes in the system. A quorum disk determines whichgroup of nodes stops operating and processing I/O requests. In this tie-b

39、reaksituation, the first group of nodes that accesses the quorum disk is marked as theowner of the quorum disk and as a result continues to operate as the system,handling all I/O requests. If the other group of nodes cannot access the quorumdisk or finds the quorum disk is owned by another group of

40、nodes , it stopsoperating as the system and does not handle I/O requests.A system can have only one active quorum disk that is used for a tie-breaksituation. However, the system uses three quorum disks to record a backup ofsystem configuration data to be used in the event of a disaster. The systemau

41、tomatically selects one active quorum disk from these three disks. The activequorum disk can be specified by using the chquorum command-line interface(CLI) command with the active parameter. To view the current quorum diskstatus, use the lsquorum command.专业资料The other quorum disk candidates provide

42、redundancy if the active quorum diskfails before a system is partitioned. To avoid the possibility of losing all thequorum disk candidates with a single failure, assign quorum disk candidates onmultiple storage systems.Note: Mirrored volumes can be taken offline if no quorum disk is available. Thesy

43、nchronization status for mirrored volumes is recorded on the quorum disk.Important: Make sure that you move any quorum disks to a different controllerbefore you do maintenance on a service controller.In a Storwize ? V5000 system with a single control enclosure or without anyexternal managed disks, q

44、uorum is automatically assigned to drives. In thisscenario, manual configuration of the quorum disks is not required.In a system with two or more I/O groups, the drives are physically connected toonly some of the node canisters. In such a configuration, drives cannot act astie-break quorum disks; ho

45、wever, they can still be used to back up metadata.If suitable external MDisks are available, these MDisks are automatically used asquorum disks that do support tie-break situations.If no suitable external MDisks exist, the entire system might become unavailableif exactly half the node canisters in t

46、he system become inaccessible (such as dueto hardware failure or becoming disconnected from the fabric).专业资料In systems with exactly two control enclosures, an uncontrolled shutdown of acontrol enclosure might lead to the entire system becoming unavailable becausetwo node canisters become inaccessibl

47、e simultaneously. It is therefore vital thatnode canisters are shut down in a controlled way when maintenance is required.Quorum configuration is chosen by the following criteria:? The drive is redundant and stable.? The drives are in a control enclosure.? No unrecoverable errors are logged against

48、the drive? Quorum is distributed among the available control enclosures.? Flash drives are avoided.? Nearline hard disk drives are avoided.? Drive use in order of priority is spare, candidate, and then member.These criteria are not requirements. On configurations where meeting all thecriteria is not

49、 possible, quorum still is automatically configured.It is possible to assign quorum disks to alternative drives by using the chquorumcommand. However, you cannot move quorum to a drive that creates a lessoptimum configuration. You can override the dynamic quorum selection byusing the override yes op

50、tion of the chquorum command. This option is notadvised, however, unless you are working with your support center.专业资料When you change the managed disks that are assigned as quorum candidatedisks, follow these general guidelines:? When you use quorum drives, use drives from the control enclosure when

51、 possible for the best available performance and connectivity. If no external MDisks are available, at least one drive and ideally three drives in the control enclosure must be present and have a use that is not unused or failed.? When you use SAN-attached quorum MDisks, aim to distribute the quorum candidate disks so that each MDisk is provided by a different storage system. For information about which storage systems are supported for quorum disk