HP Serviceguard Storage Management Suite Version A.02.01 for HP-UX 11i v2 Release Notes, Edition 2 (May 2010)

Product Issues and Limitations
This section provides information on known issues and limitations for the HP Serviceguard
Storage Management Suite Version A.02.01 HP-UX 11i v2 bundles at the time of this release. For
the most recent information contact your HP support representative or the Hewlett-Packard IT
Resource Center.
Guidelines for CFS Nested Mounts
A maximum of four levels of nesting is supported with CFS nested mounts. VxFS, Check Point
(ckpt), and snapshot cluster file systems are supported with CFS nested mounts. However, ckpt
and snapshot cluster file systems can only be mounted at the end of the nesting sequence, not
at the beginning or middle of the nesting sequence. CFS admin scripts changes: With the nested
mount point feature enabled, the only change in the cfsmntadm add command interface is to
specify a nested mount point in place of a normal mount point. For example:
cfsmntadm add <shared_disk_group> <shared_volume> <mount_point>
[<package_name>] <node_name>= [<mount_options>]... is now changed to:
cfsmntadm add <shared_disk_group> <shared_volume>
<mount_point/nested_mount_point> [<package_name>] <node_name>=
[<mount_options>]...
Use Case Examples
• Creating a mount point that is not nested:
cfsmntadm add cvm_dg1 lvol1 /cfs1 all=rw
• Creating a nested mount point:
cfsmntadm add cvm_dg1 lvol2 /cfs1/cfs2 all=rw (assuming cvm_dg1/lvol1
is already mounted on /cfs1, /cfs1/cfs2 becomes a nested mount point)
• Creating a ckpt nested mount point:
cfsmntadm add ckpt ckpt1 /cfs1 /cfs1/ckpt1 all=ro (if /cfs1 is a CFS mount
point, /cfs1/ckpt1 becomes a nested mount check point)
• Creating a snapshot nested mount point:
cfsmntadm add snapshot cvm_dg1 lvol3 /cfs1 /cfs1/snapshot1 snapshot1
all=ro (if /cfs1 is a CFS mount point, /cfs1/snapshot1 becomes a nested snapshot
mount point)
The mknod Command Is Not Supported with CFS
You cannot use the mknod command to create devices on a cluster mounted file system - attempts
to use the mknod command will return Invalid argument.
SCSI-3 Persistent Reservation Support
Veritas Cluster Server (VCS) relies on SCSI-3 Persistent Reservation being supported on the
storage. This is part of the Veritas split brain prevention. HP Serviceguard uses a different and
more robust method to prevent split brain, there is no need for SCSI-3 Persistent Reservation on
the storage.
Use of HP-UX mount Commands for CFS Environments
Once the disk group and mount point multi-node packages are created in Serviceguard, it is
critical to use the CFS commands, including cfsdgadm, cfsmntadm, cfsmount, and
cfsumount. If the HP-UX commands such as mount and umount are used, it could cause serious
problems such as writing to the local file system instead of the cluster file system.
36 HP Serviceguard Storage Management Suite Version A.02.01 for HP-UX 11i v2 Release Notes