Verifying GAB


Verifying GAB
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Verify the GAB operation using the gabconfig -a command. This command returns the GAB port membership information.

The ports indicate the following:

a	GAB
b	I/O fencing
d	Oracle Disk Manager (ODM)
f	Cluster File System (CFS)
h	Veritas Cluster Server (VCS: High Availability Daemon)
u	Cluster Volume Manager (CVM) (to ship commands from slave node to master node) Port u in the gabconfig output is visible with CVM protocol version >= 100.
v	Cluster Volume Manager (CVM)
w	vxconfigd (module for CVM)
y	Cluster Volume Manager (CVM) I/O shipping

For more information on GAB, refer to the Veritas Cluster Server Administrator's Guide.

To verify GAB

To verify that GAB operates, type the following command on each node:
```
/sbin/gabconfig -a
```
Review the output of the command:
- If GAB operates, the following GAB port membership information is returned:
```
GAB Port Memberships
===================================
Port a gen  ada401 membership 01
Port b gen  ada40d membership 01
Port d gen  ada409 membership 01
Port f gen  ada41c membership 01
Port h gen  ada40f membership 01
Port u gen  ada41a membership 01
Port v gen  ada416 membership 01
Port w gen  ada418 membership 01
Port y gen  ada42a membership 01
```
  Note that port b in the gabconfig command output may not indicate that I/O fencing feature is configured. After you configure SFCFSHA using the installer, the installer starts I/O fencing in disabled mode. You can use the vxfenadm -d command to verify the I/O fencing configuration.
- If GAB does not operate, the command does not return any GAB port membership information:
```
    GAB Port Memberships
    ===================================
```