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External storage must support SCSI-3 PR.
Volume should be configured by LUN(Logical Unit Number) unit. Partitioned volume in a LUN is not supported.
If use PrType 3, at least 1GByte LUN is needed for key reservation.
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To configure HA with shared storage environment, MCCS provides shared disk agent and SCSI Lock agent.
You can use only shared disk resource, or use with SCSI Lock resource. Shared disk resource depends on SCSI Lock resource and multiple shared disk resource can depends on a SCSI Lock resource.
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1. Shared disk agent manage disk access in local node, but SCSI Lock agent manage node access in storage.
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Disk management function in software perspective (shared disk agent)
Disk management function in hardware perspective (SCSI Lock agent)
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PrType (Persist Type) 1 : Type1 controls 'Write" of LUN. When use this option, shared disk resource can be used as lock disk. (Exclusive Write)
디스크는 작은 용량(약 1GB)으로도 가능하며 내용은 보호하지 않습니다. |
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SCSI-Lock resource can be configured in 2 ways with shared disk resource. Configuration process changes according to the attribute value of SCSI Lock resource.
1. When shared disk and SCSI Lock resource is configured with the same LUN (PrType=1)
When you define an attribute of SCSI Lock resource as PrType=1, you can configure shared disk and SCSI Lock resource with the same LUN.
SCSI Lock agent manages DATA-DISK(shared disk resource) using by MOUNT/UMOUNT command and manages LOCK-DISK(SCSI Lock resource) using by SCSI-3 PR as shown below.
By setting up the dependency between SCSI Lock resources and shared disk resources, any damage of data-disk can be prevented which may occur in such case like Split-Brain.
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- When add a resource from a group name, select a group -> right click -> 'Add Resource'.
[Figure] Adding Resource in a group - Select 'SCSILOCK' from Resource Type lists and click 'Next' button.
[Figure] Select Resource Wizard View - Next steps are same as adding in resource type.
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- ResourceType - Right Click - Click Add Resource
[Figure] Adding Resource in a resource type - 정보를 모두 가져오면 스카시예약 리소스로 사용할 장치경로를 선택할 수 있습니다.
[Figure] Selecting driver letter View - When there is no disk for SCSI Lock resource, "Disk Not Found" message appears.
[Figure] Disk Not Found - 스카시예약 리소스에 사용할 장치경로를 선택하면 자동으로 권장이름을 제공해줍니다.
[Figure] Select device path - Click 'Finish' and SCSI Lock resource is added.
[Figure] Adding SCSI Lock resource is completed
Deleting
Select resource type - right click - delete resource
- Select "Delete Resource".
[Figure] Delete SCSI Lock resource view
State
다음 테이블은 상태와 사용자 명령에 의해 발생되는 MCCS 리소스의 상태 이동에 대해 설명합니다.
명령은 사용자에 의해 발생되는 것을 전제로 합니다.
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