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- Install MCCS on both nodes
- Set group
- Add shared disk resource
- Enable shared disk resource and check offline on both nodes
- Add SCSI Lock resource (Select new device path which is not assigned for shared disk resource.)
- Enable SCSI Lock resource and check Key in resource attribute in MCCS Console
- Change PrType 1 to 3 for attribute of SCSI Lock resource
- Configure dependency of resources (SCSI Lock resource must go online first)
- Test failover from node2 to 1
- Test failover from node1 to 2
- Customer applications that use the volume setting
Adding
스카시 예약 응용 리소스를 그룹에 추가합니다.
스카시 예약 리소스 구성전에, SCSI3지원 스토리지를 통해 볼륨을 사전에 구성 해야 합니다Add 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.
- When add a resource from a group name, select a group → right click → 'Add Resource'.
- Select 'SCSILOCK' from Resource Type lists and click 'Next' button.
- If you select a device path used for the SCSI reservation resource, a name will be automatically recommended.
[그림] 스카시예약 리소스 추가 화면
완료 버튼을 클릭하면 스카시 예약 리소스가 추가 되며,
관리 웹 콘솔 상에서 바로 확인이 가능합니다Figure] SCSI Reservation Resource Added - Click the 'Finish' button to add the SCSI reservation resource.
You can immediately check the result in the management web console.
Deleting
Select resource type → right click → delete resource.
삭제된 리소스는 관리 웹콘솔 상에서 바로 사라집니다. The deleted resource will immediately disappear from the management web console.
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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| Status | Agent command | Description | Note |
|---|---|---|---|
Online Disk key is exclusively reserved at an online node. | Offline | It ignores the reservation key stored. It first creates a new reservation key and switches to offline while maintaining the reservation. | |
| Monitoring | Compares the key reserved in the disk and check if there is a reservation made on the disk. | ||
Offline 1. Disk is reserved but the resource is still offline. | Online | Register a key for a disk reservation and wait for a response from the other node. After going online once, the other node reservation is stolen. This is called preempt. | |
| Monitoring | Compares the key reserved in the disk and check if there is a reservation made on the disk. | ||
Trouble It occurs when a reservation is stolen while going online. | Online | Register a key for a disk reservation and wait for a response from the other node. After going online once, the other node reservation is stolen. This is called preempt. | |
| Offline | It ignores the reservation key stored. It first creates a new reservation key and switches to offline while maintaining the reservation. |
Attribute
스카시 예약 리소스의 고유 속성을 표시 합니다.Display the unique attribute of SCSI reservation resource.
Attribute | Description | Data Type | Default | Edit | Note |
| DevicePath | Define the device path of disk to be used for reservation. When register device path, DUID of connected disk will automatically obtain. | STRING | X | ||
| 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 | ||
| Key | MAC address is used as Reserved-Key. This key is automatically set by agent. | STRING | X | ||
| PreemptWaitCount | Time waiting for permission of other node before reservation Waiting time is (PreemptWaitCount * MonitorInterval) seconds. | STRING | 2 times | O | |
| 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. 3 (Exclusive Access) is used when only Lock_Disk is used. In this case, SCSI Lock agent LUN is required. | STRING | Prytpe = 1 | O |
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