Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

GAB INFO V-15-1-20026 Port a registration waiting for seed port
membership
Verifying normal functioning of VCS I/O fencing
It is mandatory to have VCS I/O fencing enabled in SF Oracle RAC cluster to protect
against split-brain scenarios. VCS I/O fencing can be assumed to be running
normally in the following cases:
■ Fencing port 'b' enabled on the nodes
# gabconfig -a
To verify that fencing is enabled on the nodes:
# vxfenadm -d
■ Registered keys present on the coordinator disks
# vxfenadm -g all -f /etc/vxfentab
Managing SCSI-3 PR keys in SF Oracle RAC cluster
I/O Fencing places the SCSI-3 PR keys on coordinator LUNs. The format of the
key follows the naming convention wherein ASCII “A” is prefixed to the LLT ID
of the system that is followed by 7 dash characters.
For example:
node 0 uses A-------
node 1 uses B-------
In an SF Oracle RAC/SF CFS/SF HA environment, VxVM/CVM registers the keys
on data disks, the format of which is ASCII “A” prefixed to the LLT ID of the system
followed by the characters “PGRxxxx” where ‘xxxx’ = i such that the disk group
is the ith shared group to be imported.
For example: node 0 uses APGR0001 (for the first imported shared group).
In addition to the registration keys, VCS/CVM also installs a reservation key on
the data LUN. There is one reservation key per cluster as only one node can reserve
the LUN.
See “About SCSI-3 Persistent Reservations” on page 44.
The following command lists the keys on a data disk group:
239Prevention and recovery strategies
Verifying normal functioning of VCS I/O fencing