4.0.0 HP Polyserve Matrix Server Administration Guide (T5392-96052, March 2010)

18 SAN maintenance
The following information and procedures apply to SANs used with Matrix Server.
Server access to the SAN
When a server is either added to the cluster or rebooted, Matrix Server needs to
take some administrative actions to make the server a full member of the cluster with
access to the shared filesystems on the SAN. During this time, the PolyServe
Management Console reports the message “Joining cluster” for the server. The
message is removed when the administrative actions are complete and the server is
participating in the cluster.
A server can lose access to all or part of the SAN for several reasons:
• Network problems. Cluster partitioning can occur when cluster network commu-
nications are lost but the affected server can still access the SAN. Matrix Server
then removes the server’s access to the SAN to protect the integrity of the shared
filesystems. You will need to reboot the server to restore its SAN access.
• SAN hardware problems or misconfiguration of a Fibre Channel switch. The
server’s access to the SAN will be restored automatically when the hardware is
repaired or reconfigured correctly.
• Repeated I/O errors when the server tries to write to a PSFS journal. The server
then loses access to the affected filesystem. When the disk experiencing the I/O
errors is fixed, the server will automatically regain access to the filesystem.
The PolyServe Management Console typically displays an alert message when a
server loses access to the SAN.
PSFS filesystem panic messages
If you receive a panic message from the PSFS filesystem, report it to HP Support at
your earliest convenience. Then reboot the affected server to recover from the error
condition.
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