HP StorageWorks Clustered File System 3.6.0 Windows Storage Server Edition Administration Guide (403103-005, January 2008)

Chapter 19: SAN Maintenance 237
This can be done either by rebooting the servers after you make the
partition table changes, or by manually disabling access to the disks
before making the partition table changes and then reenabling access
afterwards.
If you should later need to repartition a disk containing a membership
partition, you will need to stop HP Clustered File System before you
change the layout. While the cluster is stopped, you will not be able to
access other disks in the cluster. You will also need to take one of the
above steps to force the servers in the cluster to recognize the changes.
Display the Status of SAN Ownership Locks
HP Clustered File System uses a set of disk-based data structures called
SANlocks to protect filesystem integrity. If a problem causes a cluster to
split into two or more network partitions, the SANlocks ensure that only
one of the resulting network partitions has access to the SAN.
Each SANlock is stored in a membership partition. Before a cluster can
begin accessing the SAN, it must first acquire a majority of the SANlocks.
The SANlocks are acquired in order.
mxsanlk displays the status of the SANlock stored in each membership
partition. It can be used to determine whether any of the membership
partitions need to be repaired. Also, if a network partition occurs,
mxsanlk can be used to determine which network partition has control of
the SAN.
When you invoke mxsanlk, it checks for the Storage Device Monitor
Pulse (SDMP) process. This process is responsible for grabbing and
maintaining the locks on the membership partitions. The SDMP
administrator is the administrator for the cluster to which the host
belongs.
Following is some sample output from mxsanlk. The command was
issued on host 10.10.30.3 and there are three membership partitions.