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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 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

There are two way to add a resource which one is select this from a group name and another is select this from a resource type.

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스카시 예약 응용 리소스를 그룹에 추가합니다.
스카시 예약 리소스 구성전에, SCSI3지원 스토리지를 통해 볼륨을 사전에 구성 해야 합니다. 

  1. Select a group → right click → 'Add Resource'. 
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    [Figure] Adding Resource in a group

  2. Select 'ServiceSCSILock' from Resource Type lists and click 'Next' button
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    [Figure] Select Resource Wizard View

  3. Next steps are same as adding in resource type.

Adding in Resource Type

  1. ResourceType → Right Click → Click Add Resource
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    [Figure] Adding Resource in a resource type

    Getting disk information.
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    [Figure] Screen of Getting disk information.
    DriveLetter to be used for SCSILock can be selected.
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    [Figure] Selecting driver letter View
    When there is no disk for SCSI Lock resource, "Disk Not Found" message appears
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    [Figure] Disk Not Found

  2. Enter resource name. If you skip enter resource name, this will be given 'SLock_value' which value is selected driver letter.
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    [Figure] Selecting driver letter View

    Click 'Finish' and SCSI Lock resource is added.
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    [Figure] Adding SCSI Lock resource is completed그림] 스카시예약 리소스 추가 화면

  3. 완료 버튼을 클릭하면 스카시 예약 리소스가 추가 되며, 
     관리 웹 콘솔 상에서 바로 확인이 가능합니다.

Deleting

Select resource type → right click → delete resource.

              Select "Delete Resource". 
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              [Figure] Delete SCSI Lock resource view

삭제된 리소스는  관리 웹콘솔 상에서 바로 사라집니다.  

Status

The following table explains the status switching of the MCCS resource caused by a user's command and the status.
The command assumes that it is generated by a user.

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StatusAgent commandDescriptionNote

Online

Disk key is exclusively reserved at an online node.
You cannot register a key at another node. 

Offline

It switches to offline while maintaining the reservation.

 
Monitoring

Check if there is a reservation made on the disk.

 

Offline

1. Disk is reserved but the resource is still offline.
2. The actual offline state where the other node acquired a reservation. 

OnlineRegister a key for a disk reservation and wait for a response from the other node.  
Monitoring

Check if there is a reservation made on the disk.

 

Trouble

It occurs when a reservation is stolen while going online.

OnlineRegister a key for a disk reservation and wait for a response from the other node.  
OfflineIt switches to offline while maintaining the reservation. 

 

 

Attribute

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[Figure] SCSI Lock Resource Attribute view

SCSI Lock resource provides the following detailed attributes as well.
Setting are available in "Resource Unique Attribute" in resource's attribute tab.
Each attribute value has the following meanings:

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스카시 예약 리소스의 고유 속성을 표시 합니다.

Attribute

Description

Type

DefaultEditNote
DiskDUID

DUID(Device Unique ID, 16 byte as Hex value) of disk is used as identifier. Specify DUID of reserve disk.
This value is secure when DriveLetter atribute us specified. Try not to insert this value yourself.
DUID information can be checked through scsicmd.cmd command and both nodes need to have the same value.

STRING X 
DriveLetter

Disk to be used for reservation is specified by drive letter.
When register drive letter, DUID of connected disk will automatically obtain in drive letter.

STRING X 
KeyMAC address is used as Reserved-Key. This key is automatically set by agent.STRING   
PreemptWaitCount

Time waiting for permission of other node before reservation
Waiting time is (PreemptWaitCount * MonitorInterval) seconds.

INTEGER2 timesO 
PrType

This attribute decides on how to give the permission of reserve disk access as Persist Type specified in SCSI3-PR spec.
There are 6 types bur MCCS uses 1 (Write Exclusive) or 3 (Exclusive Access).
1 (Write Exclusive) is used when same LUN is used with shared disk, and Disk Letter can be checked in explorer.
3 (Exclusive Access) is used when only Lock_Disk is used.
In this case, SCSI Lock agent LUN is required. 'Mount' state of disk changes to 'un-mount' state.Therefore, Disk Letter will disappear from explorer.

INTEGER

Prtype=1O 

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