HP XP Racks - Manual (Page 25)

- Number of LDEVs: 1.
- Cache mode: This parameter is not used for quorum disks. Either Enable or Disable can
be specified.
- Inflow control: Select Disable. Data will be written in the cache memory.
- CLPR: If you partition cache memory, specify the CLPR that the quorum disk uses.
- LDKC:CU:LDEV number: The number is used to identify the quorum disk for the primary
and secondary storage systems.
5. In the External Path Groups tab in RWC, configure port parameters for the primary and
secondary storage systems by specifying the following values:
•
QDepth: This is the number of Read/Write commands that can be issued (queued) to the
quorum disk at a time.
The default is 8.
•
I/O TOV: This is the timeout value to the quorum disk from the primary and secondary
storage systems. The value must be less than the time-over value from the application.
Recommended: 15 seconds
Default: 15 seconds
•
Path Blockade Watch: This is the time that you want the system to wait after the quorum
disk paths are disconnected before the quorum disk is blocked.
Recommended: 10 seconds; Default: 10 seconds.
Adding the ID for the quorum disk to the storage systems
Adding the ID for the quorum disk is the fourth main task in the system configuration. Completion
of this task ensures that the primary and secondary storage systems to which the disk has been
mapped can recognize the disk.
Prerequisites
Before you begin, make sure you have:
•
Configured the quorum disk (see “Configuring the quorum disks” (page 24) ).
Procedure
To ensure that the quorum disk ID is added correctly, make sure that:
•
You complete the procedure on the primary and secondary storage systems.
•
You use the same ID for the disk on both systems.
1. Delete any data in the external volume that you assigned to be the quorum disk.
2. Access the MCU or RCU in RWC, then click Actions > Remote Copy > Continuous Access
Synchronous > Quorum Disk Operation.
3. Make sure that you are in the modify mode.
4. In the Quorum Disk Operation window, right-click the quorum disk ID that you want to add,
then click Add Quorum Disk ID.
5. In Add Quorum Disk ID dialog box, from the Quorum Disk drop-down menu, select the
LDKC:CU:LDEV number that you specified when mapping the external volume. This is the
volume that will be used for the quorum disk.
6. From the RCU drop-down menu, select the CU that is to be paired with the CU on the current
storage system. The list shows the RCU serial number, LDKC number, controller ID, and model
name registered in CU Free.
7. Click Set. The settings are shown in the Preview area.
Adding the ID for the quorum disk to the storage systems 25