HP Serviceguard Storage Management Suite Version A.02.01 for HP-UX 11iv3 Release Notes, Edition 2 (May 2010)

4. Delete node2 from /mpt configuration – that is, modify the CFS mount point packages and
remove node2 from their configuration:
cfsmntadm modify /mpt delete node2
5. Delete node2 from dg configuration:
cfsdgadm modify dg delete node2
6. Delete node2 from the cluster. Edit the cluster ASCII file to remove node2 from the cluster
configuration:
cmapplyconf –f cluster1-ascii-file
Step 1 is a standard step that prevents CMCLD from starting upon reboot.
Step 4 must be repeated for all CFS mount-point MNP packages.
Step 5 must be repeated for all Disk Group MNP packages.
Step 6 results in a cluster consisting only of node 1 and all MNPs redefined on node 1.
SCSI-3 Persistent Reservations Support Not Required on Storage Devices
The Veritas Cluster Server (VCS) relies on support of SCSI-3 Persistent Reservations on storage
devices - this is part of the Veritas split brain prevention mechanism. HP Serviceguard uses a
different and more robust method to prevent split brain - storage devices do not need to support
SCSI-3 Persistent Reservations in an HP Serviceguard environment.
Oracle Disk Manager (ODM) with VxFS and LVM
Oracle Disk Manager (ODM) for VxFS file systems on LVM volumes is not supported. Oracle
Files that need ODM capability must reside on a VxFS file system created on a VxVM or CVM
volume.
Oracle Disk Manager (ODM) Limitation for CFS Oracle Bundles
Single instance Oracle databases are not permitted outside of Serviceguard packages in
environments using HP Serviceguard Storage Management Suite T2776CB, T2777CB, T8686CB,
T8687CB, T8696CB and T8697CB bundles. If there are any Oracle instances not controlled by
Serviceguard packages, a halt of the system multi-node package SG-CFS-pkg could bring down
the node or cluster. Place all Oracle single instances in Serviceguard packages when deploying
these bundles. In addition, single instance Oracle packages using VxFS and VxVM must have a
direct dependency on the system multi-node package SG-CFS-pkg.
ODM Must be Used for Oracle RAC Data on CFS File Systems
ODM - Oracle Disk Manager is included in all SG SMS Oracle bundles (T2773, T2774, T2776 and
T2777). ODM must be used for Oracle RAC data on CFS file systems. ODM can also be used for
Oracle standalone databases with data on VxVM volumes with VxFS file systems. ODM is not
supported for use on file systems on LVM logical volumes. ODM improves the I/O performance
for Oracle databases with data on VxFS and CFS file systems. The performance approaches that
of Oracle data on raw disks.
Dirty Region Logging (DRL) for Mirrored Volumes
If a system failure occurs while mirrored volumes are in use, the mirrors will recover and clean
up any writes that were in progress when the system failed. The Dirty Region Logging (DRL)
feature tracks writes that are in progress to reduce the recovery effort after a system failure.
Without DRL, the entire volume must be recovered, because there is no way to determine which
blocks had writes in progress at the time of the system failure.
40 HP Serviceguard Storage Management Suite Version A.02.01 for HP-UX 11i v3 Release Notes