Compaq ProLiant Cluster HA/F500 Enhanced DT Supplement

Disaster Recovery
ProLiant Cluster HA/F500 for MA8000 Enhanced DT Supplement Guide 3-5
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: d-ch3 Disaster Recovery
Codename: Chargers Part Number: 165103-004 Last Saved On: 7/30/02 9:28 AM
The failback sequence is a scheduled event based on the configuration at the failback
site. The storage controller requires that a viable dual redundant storage subsystem
be available before a failback can take place. Failback to a single controller
configuration is not supported. A small amount of downtime is required during the
failback process.
IMPORTANT: The cluster is not available during initiator site failback. Consider this downtime
when scheduling a failback procedure.
Simple Failback Procedure for a Planned Failover
Use the simple failback procedure described in the DRM guide if the site failover is
for a scheduled event.
The cluster nodes at both sites must be rebooted after you perform a simple failback
procedure. The cluster will start normally and applications and data accessed by
means of MSCS will be available.
Full Failback Procedure for an Unplanned Failover
One of two procedures must be used for the site failback if the site failover is for an
unplanned event. The procedure that you use is determined by the state of the
initiator site.
• If the initiator site is intact, meaning that the servers and storage are still usable,
perform the full failback procedure described in the DRM guide.
The cluster nodes at both sites must be rebooted after you perform a full failback
procedure. The cluster will start normally, and applications and data accessed by
means of MSCS will be available.
• Perform the new hardware failback procedure described in the DRM guide if the
initiator site is not intact, that is, the servers and storage must be replaced.
IMPORTANT: MSCS must be reinstalled on the initiator site after a new hardware
failback procedure is performed for an unplanned failover in an HA/F500 Enhanced DT
cluster. Do not reinstall MSCS on the target site.