SFHA Solutions 6.0.1: Managing SCSI-3 disk registrations and reservations using the vxfenadm utility and the vxfenclearpre utility

[Liz_Semmelmeyer]

You can use the vxfenadm utility to troubleshoot and test SCSI-3 disk registrations and I/O fencing reservations. The vxfenadm utility also displays information about I/O fencing operations.

For information on the vxfenadm utility for managing SCSI-3 disk registrations and I/O fencing reservations, see:

• About the vxfenadm utility
• About the I/O fencing registration key format
• Displaying the I/O fencing registration keys
• Verifying that the nodes see the same disk
• Manually removing existing keys from SCSI-3 disks
• Cluster ID on the I/O fencing key of coordinator disk does not match the local cluster's ID

Typically, you use the vxfenadm –d command to verify that the cluster is running with disk-based or server-based I/O fencing set up when you perform the following tasks:

• Enabling or disabling the preferred fencing policy
• Replacing defective disks when the cluster is offline
• Refreshing registration keys on the coordination points for server-based fencing
• Replacing coordination points for server-based fencing in an online cluster
• Migrating between fencing configurations using response files

You can use the vxfenclearpre utility to unregister SCSI-3 registrations and release disk reservations.

You need to clear registrations on coordinator disks using the vxfenclearpre utility in the following cases:

• A potential split-brain condition (with disk-based fencing configured).
• A cluster does not use a unique set of coordinator disks.

For information on using the vxfenclearpre utility to unregister SCSI-3 registrations and release disk reservations, see:

• About the vxfenclearpre utility
• Removing preexisting keys

The following Symantec Connect article provides a use case for troubleshooting SCSI-3 registrations:

Checking SCSI3 compatibility for fencing coordinator disks

vxfenadm (1M) 6.0.1 manual pages:

• AIX
• HP-UX
• Linux
• Solaris

vxfenclearpre (1M) 6.0.1 manual pages:

• AIX
• HP-UX
• Linux
• Solaris

Veritas Cluster Server documentation for other releases and platforms can be found on the SORT website.