Veritas Storage Foundation 5.1 SP1 for Oracle RAC Release Notes (5900-1513, April 2011)

Software limitations
This section describes the software limitations in this release.
Stopping systems in clusters with I/O fencing configured
The I/O fencing feature protects against data corruption resulting from a failed
cluster interconnect, or “split brain.” See the Veritas Cluster Server Administrator's
Guide for a description of the problems a failed interconnect can create and the
protection I/O fencing provides.
I/O fencing uses SCSI-3 PR keys to implement data protection. Keys are placed
on I/O fencing coordinator points and on data disks. The VCS administrator must
be aware of several operational changes needed when working with clusters
protected by I/O fencing. Specific shutdown procedures ensure keys are removed
from coordinator points and data disks to prevent possible difficulties with
subsequent cluster startup.
Using the reboot command rather than the shutdown command bypasses shutdown
scripts and can leave keys on the coordinator points and data disks. Depending
on the order of reboot and subsequent startup events, the cluster may warn of a
possible split brain condition and fail to start up.
Workaround: Use the shutdown -r command on one node at a time and wait for
each node to complete shutdown.
Limited global clustering capabilities in Veritas Cluster Server
Management Console
The Veritas Cluster Server Management Console (VCS MC) management server
currently includes limited capabilities for global clustering. Use the VCS graphical
user interface (hagui) to take advantage of global clustering capabilities such as
Fire Drill - Readiness and Remote Group Agent for remote groups.
vxassist and vxresize operations do not work with layered volumes
that are associated to an RVG (2162579)
This issue occurs when you try a resize operation on a volume that is associated
to an RVG and has a striped-mirror layout.
Workaround:
Storage Foundation for Oracle RAC Release Notes
Software limitations
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