Cluster Server Installation Guide for Solaris x64 5.0 - Storage ...

126 Setting up I/O fencingTroubleshooting I/O fencing■Destroy a coordinator disk groupNote: Adding or removing coordinator disks requires all services be shut down.Note the following about the procedure:■■■A coordinator disk group requires three disks/LUNs.When adding a disk, add the disk to the disk group vxfencoorddg and retestthe group for support of SCSI-3 persistent reservations.You can destroy the coordinator disk group such that no registration keysremain on the disks. The disks can then be used elsewhere.To remove and replace a disk in the coordinator disk group1 Log in as superuser on one of the cluster nodes.2 If VCS is running, shut it down:# hastop -all3 Stop I/O fencing on all nodes:# /etc/init.d/vxfen stopThis removes any registration keys on the disks.4 Import the coordinator disk group. The file /etc/vxfendg includes the nameof the disk group (typically, vxfencoorddg) that contains the coordinatordisks, 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 blocks are removed.5 To remove disks from the disk group, use the VxVM disk administratorutility, vxdiskadm.You may also destroy the existing coordinator disk group. For example:# vxdg destroy vxfencoorddg6 Add the new disk to the node, initialize it as a VxVM disk, and add it to thevxfencoorddg disk group.See “Creating the coordinator disk group and setting the coordinatorattribute” on page 105.7 Test the recreated disk group for SCSI-3 persistent reservations compliance.See “Testing the coordinator disk group using vxfentsthdw -c” on page 111.8 After replacing disks in a coordinator disk group, deport the disk group: