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44 Preparing Your Systems for Clustering
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This warning message alerts you to the possibility of data loss if certain precautions are not
taken to protect the integrity of the data on your cluster.
NOTICE: To prevent data loss, your cluster must meet the conditions in the following bulleted list before
you attempt any data-destructive operation on your shared hard drives.
• Ensure that the peer system is turned on during the operation so that the PERC RAID
adapter’s NVRAM can be updated with the new configuration information. Alternately, if the
peer system is down, you must save the disk configuration to the shared storage system.
When you restart the system later, update the peer system’s NVRAM from the disk
configuration saved to the shared storage system.
• Ensure that the peer cluster node is not currently configuring the shared storage system.
• Ensure that I/O activity does not occur on the shared storage system during the operation.
• Ensure that your PERC RAID adapter firmware is the latest version. See your PERC RAID
adapter documentation for information on downloading the latest firmware.
Enabling the Cluster Mode Using the PERC RAID Adapter
Each PERC RAID adapter that is used to connect to a shared storage enclosure must have
cluster mode enabled using the PERC RAID adapter’s BIOS configuration utility. Enabling
cluster mode implements the additional functionality required for the controller to operate in a
cluster environment.
NOTICE: If you replace your PERC RAID adapter, ensure that you enable the cluster mode on the
replacement PERC RAID adapter and set the SCSI ID to the appropriate value (6 or 7) before you connect
the SCSI cables to the shared storage. See "Maintaining Your Cluster" for more information.
For more information about enabling cluster mode, see the PERC RAID adapter
documentation, which includes information on the SCSI host adapter.
Setting the SCSI Host Adapter IDs
After cluster mode on the PERC RAID adapter is enabled, the option to change the SCSI ID for
both of the adapter’s channels will appear. For each shared SCSI bus (a connection from a
channel on one system's PERC RAID adapter to the shared storage enclosure to a channel on
the second system's PERC RAID adapter), the SCSI IDs for each controller must be different.
The default SCSI ID for the PERC RAID adapter is ID 7; thus, the SCSI ID for one of the
system's PERC RAID adapters must be changed to ID 6.
For cluster configurations with two PERC RAID adapters in each node connected to shared
storage enclosures, set both controllers in one system to SCSI ID 6; that is, one node's pair of
PERC RAID adapters utilizes SCSI ID 7 (default) and the other node's pair of PERC RAID
adapters is changed to utilize SCSI ID 6.
se500wbk1.book Page 44 Thursday, June 16, 2005 4:19 PM