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

About the vxfenswap utility
The vxfenswap utility allows you to replace coordinator disks in a cluster that is
online. The utility verifies that the serial number of the new disks are identical
on all the nodes and the new disks can support I/O fencing.
This utility also supports server-based fencing.
Refer to the vxfenswap(1M) manual page.
See the Veritas Storage Foundation for Oracle RAC Installation and Configuration
Guide for details on the I/O fencing requirements.
You can replace the coordinator disks without stopping I/O fencing in the following
cases:
■ The disk becomes defective or inoperable and you want to switch to a new
diskgroup.
See “Replacing I/O fencing coordinator disks when the cluster is online”
on page 123.
See “Replacing the coordinator diskgroup in a cluster that is online” on page 125.
If you want to replace the coordinator disks when the cluster is offline, you
cannot use the vxfenswap utility. You must manually perform the steps that
the utility does to replace the coordinator disks.
See “Replacing defective disks when the cluster is offline” on page 206.
■ You want to switch the disk interface between raw devices and DMP devices.
■ The keys that are registered on the coordinator disks are lost.
In such a case, the cluster might panic when a network partition occurs. You
can replace the coordinator disks with the same disks using the vxfenswap
command. During the disk replacement, the missing keys register again without
any risk of data corruption.
See “Refreshing lost keys on coordinator disks” on page 130.
In server-based fencing configuration, you can use the vxfenswap utility to perform
the following tasks:
■ Perform a planned replacement of customized coordination points (CP servers
or SCSI-3 disks).
See “Replacing coordination points for server-based fencing in an online
cluster” on page 143.
■ Refresh the I/O fencing keys that are registered on the coordination points.
See “Refreshing registration keys on the coordination points for server-based
fencing” on page 141.
Administering SF Oracle RAC and its components
Administering I/O fencing
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