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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.

Types of Shared disk resource

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2. Both the shared disk agent and the SCSI reservation agent can read and write data.
However, a SCSI reservation agent intends to protect the shared storage resource, so you are not recommended to use it alone to read and write data.
Thus, a SCSI reservation agent can be used together with a shared storage agent or can use a separate LUN from the shared storage (PrType option). 

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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)

PrType (Persist Type) 3 : Typ3 controls "Access" of LUN. When use this option, exclusive LUN is needed for lock disk

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Configuration

There are two different ways to configure the SCSI reservation agent resource and the shared disk agents resource. It depends on the attribute of the SCSI reservation agent resource.

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1. When shared disk and SCSI Lock resource is configured with the same LUN (PrType=1)In the SCSI reservation agent resource, use the option of PrType = 1. In this case, LUN will be used to configure the shared disk resource and the SCSI reservation resource.

A shared disk agent uses the MVL driver to manage DATA-DISK and a SCSI reservation agent uses the SCSI3-PR function to manage LOCK-DISK.
By setting the dependency between the SCSI reservation resource and the shared disk resource, you can prevent damages to DATA-DISK caused by Split-Brains and so on.

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[Figure] Shared disk and SCSI Lock resource configured in same LUN (PrType=1)2. Shared disk and SCSI lock resource is configured with different LUN (PrType=3)A shared disk agent manages DATA-DISK on the single drive character basis, and a SCSI reservation agent manages the standalone LUN exclusively for LOCK-DISK.
For this configuration, there must be at least two LUN segments existing on the shared disk.
As shown below, create the LOCK-DISK volume that will depend on a shared disk agent in a 1:1 relationship.
By using multiple shared disk agents, and one SCSI reservation agent, you can configure the dependency for use.
This disk with small capacity is allowed because it is used to check the node that can access the storage.
By setting the dependency between the SCSI reservation resource and the shared disk resource, you can prevent damages to DATA-DISK caused by Split-Brains and so on.

Image Removed   [Figure] Shared disk and SCSI Lock resource is configured with different LUN( PrType=3)

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1. Shared disk and SCSI Lock resource is configured in same LUN (PrType=1).

[Figure] Shared disk and SCSI Lock resource configured in same LUN

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1. Install MCCS on both nodes
2. Set group
3. Add shared disk resource
4. Enable shared disk resource and check offline on both nodes
5. Add SCSI Lock resource (Select drive letter that created shared disk resource)
6. Enable SCSI Lock resource and check key in resource attribute of MCCS console.
7. Configure dependency of resources (SCSI Lock resource must go online first)
8. Test failover from node 2 to 1 
9. Test failover from node 1 to 2
10. Set application that customer uses

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Image Removed

[Figure] Shared disk and SCSI Lock resource configured with different LUN 

First, register shared disk agent according to the procedure and after check if it works normally, check disk of SCSI Lock agent.  

1. Install MCCS on both nodes
2. Set group
3. Add shared disk resource 
4. Enable shared disk resource and check offline on both nodes
5. Add SCSI Lock resource (Select new drive letter, not from the one in shared disk resource)
6. Enable SCSI Lock resource and check Key in resource attribute in MCCS Console
7. Change PrType 1 to 3 for attribute of SCSI Lock resource. (When SCSI Lock resource is added, make sure that SCSI Lock Disk Letter are disappeared from Windows Explorer of both servers.)
8. Configure dependency of resources (SCSI Lock resource must go online first)
9. Test failover from node2 to 1
10. Test failover from node1 to 2
11. Customer applications that use the volume setting

Adding

Add the SCSI reservation application resource to a group.
Before configuring the SCSI reservation resource, you must configure the volume in advance by using the SCSI3 supporting storage. 

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scsicmd.cmd Command

Syntax

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