The shared-disk cluster examples that appear in this reference are designed for use with the
high-availability features of the IBM ServeRAID II Ultra SCSI Adapter, the IBM Netfinity ServeRAID-3H
Ultra2 SCSI Adapter, or the IBM Netfinity Fibre Channel RAID Controller using the clustering programs
provided in the Netfinity Cluster Pack by Vinca, IBM Part Number 01K8018.
This section also provides the instructions needed to modify the cluster examples for use with Microsoft
The Microsoft Cluster Server software requires the use of a quorum drive, which is a shared logical
drive that both servers can use to store and retrieve data.
Important Quorum Information
- The servers must share the quorum logical drive. Therefore, the physical drives used when
defining the quorum logical drive must reside in one of the storage expansion enclosures with the
other shared drives.
- The cluster software stores several MB of data on the quorum drive. You can use the remaining
space in the quorum logical drive to store other application programs and data.
- The quorum drive presents a single point of failure. If this logical drive becomes defunct, the
failover and failback functions will not occur. To help maintain high availability, define a RAID
level-1 logical drive for use as the quorum drive.
- When using the Microsoft Cluster Server program with the IBM ServeRAID II or ServeRAID-3H
adapters, you also must connect Channel 3 of a ServeRAID adapter in Server A to Channel 3 of a
ServeRAID adapter in Server B, then, define the quorum drive as a RAID level-1 logical drive on
Channel 1 or Channel 2 of the same pair of ServeRAID adapters. When one server fails, this
dedicated quorum-arbitration link is used to locate and then transfer control of the shared disks to
the nonfailing server.
Note: You must use Channel 3 of the ServeRAID adapters that connect to the quorum logical
drive as a dedicated quorum-arbitration link. Do not connect any other devices to this channel.
Please see the LEGAL - Trademark notice.
Feel free - send a for any BUG on this page found - Thank you.