Review the procedures to add, remove, or replace one or more coordinator disks in a cluster that is operational.
Warning: |
The cluster might panic if any node leaves the cluster membership before the vxfenswap script replaces the set of coordinator disks. |
To replace a disk in a coordinator disk group when the cluster is online
# hares -display coordpoint -attribute FaultTolerance -localclus
#hares -display coordpoint -attribute LevelTwoMonitorFreq -localclus
# hares -modify coordpoint LevelTwoMonitorFreq 0
# vxfenadm -d
I/O Fencing Cluster Information: ================================ Fencing Protocol Version: 201 Fencing Mode: SCSI3 Fencing SCSI3 Disk Policy: dmp Cluster Members: * 0 (sys1) 1 (sys2) RFSM State Information: node 0 in state 8 (running) node 1 in state 8 (running)
The file /etc/vxfendg
includes the name of the disk group (typically, vxfencoorddg) that contains the coordinator disks, so use the command:
# vxdg -tfC import 'cat /etc/vxfendg'
where:
-t specifies that the disk group is imported only until the node restarts.
-f specifies that the import is to be done forcibly, which is necessary if one or more disks is not accessible.
-C specifies that any import locks are removed.
VRTSvxvm
version, then skip to step 10. You need not set coordinator=off to add or remove disks. For other VxVM versions, perform this step:Where version
is the specific release version.
Turn off the coordinator attribute value for the coordinator disk group.
# vxdg -g vxfencoorddg set coordinator=off
Perform the following steps to add new disks to the coordinator disk group:
Add new disks to the node.
Initialize the new disks as VxVM disks.
Check the disks for I/O fencing compliance.
Add the new disks to the coordinator disk group and set the coordinator attribute value as "on" for the coordinator disk group.
Note that though the disk group content changes, the I/O fencing remains in the same state.
The utility performs the following tasks:
Backs up the existing /etc/vxfentab
file.
Creates a test file /etc/vxfentab.test
for the disk group that is modified on each node.
Reads the disk group you specified in the vxfenswap command and adds the disk group to the /etc/vxfentab.test
file on each node.
Verifies that the serial number of the new disks are identical on all the nodes. The script terminates if the check fails.
Verifies that the new disks can support I/O fencing on each node.
Confirm whether you want to clear the keys on the coordination points and proceed with the vxfenswap operation.
Do you want to clear the keys on the coordination points and proceed with the vxfenswap operation? [y/n] (default: n) y
Do you wish to commit this change? [y/n] (default: n) y
If the utility successfully commits, the utility moves the /etc/vxfentab.test
file to the /etc/vxfentab
file.
The vxfenswap utility rolls back the disk replacement operation.
# vxdg -g vxfencoorddg set coordinator=on
# vxdg deport vxfencoorddg
# hares -modify coordpoint LevelTwoMonitorFreq Frequencyvalue
where Frequencyvalue is the value of the attribute.
For example, if there are four (4) coordination points in your configuration, then the attribute value must be lower than two (2).If you set it to a higher value than two (2) the CoordPoint agent faults.