Compaq ProLiant Cluster HA/F500 Administrator Guide

Setting Up the ProLiant Cluster HA/F500 with Hubs
ProLiant Cluster HA/F500 for MA8000 Administrator Guide 2-15
COMPAQ CONFIDENTIAL
Writer: Woody Jernigan File Name: c-ch2
Codename: Chargers Part Number: 355220-006 Last Saved On: 7/26/02 2:48 PM
Configuring Large LUNs
The maximum logical units a host can access per controller port or controller port
pair, if using redundant controllers, is 64. This access is accomplished automatically
with ACS 8.6 and ACS 8.7. Older versions of ACS software required the
StorageWorks Large LUN Utility to be run for a host to access more than eight LUNs
per controller port or controller port pair if using redundant controllers. The Large
LUN Utility is located in the Platform Kit that ships with the MA8000 product.
LUN 0 needs to be available and not reserved for Large LUN to function properly.
Therefore it is best not to use LUN 0 for a cluster disk. SCSI-3 mode is preferred
since LUN 0 is the Command Console LUN (CCL) and is not available.
Note that since mount points are not supported, cluster disks must have drive letters
associated with them. Therefore a cluster is able to support a maximum of 22 cluster
disks assuming drive letters A, B, C, and D are not used for cluster disks.
For maximum availability of LUNs, use the following configurations:
• Microsoft Windows NT Server 4.0, Enterprise Edition
— SCSI-3 mode with CCL always enabled
— LUNs beginning with D1 through D64
• Windows 2000 Advanced Server
— SCSI-3 mode with CCL always enabled
— LUNs beginning with D1 through D64