Install /S100 Series Compaq Switched SCSI Cluster

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Before installing the S/100 cluster, please check the following items to ensure correctness:

• Make sure the Recovery Server Option (RSO) firmware is suitable for clustering.
• Check the computer's BIOS and ensure proper revision level for the server.
• Make sure installed adapters are balanced between PCI buses according to the Compaq whitepaper on bus balancing. (This is not mandatory but may help performance under load.)
• Check IRQ assignments. If you have the opportunity to assign separate interrupts to each installed adapter, do so. If the COM ports are not in use and the additional interrupts would help accomplish this configuration, then do so. Otherwise, if you must share interrupts, only share them with similar devices. Based on experience with this configuration, we suggest having disk controllers share interrupts and each network port have a separate interrupt.
• Obtain current drivers for your network adapters. If using any Netflex-3 or "Compaq Netelligent TX 10/100" adapters that use the TLAN chipset, obtain the driver update noted in SP11377. You can also use a Compaq SSD version that contains this driver update or later revision. This update is not just for adapter teaming but helps avoid some possible issues with these adapters in some configurations.
• Obtain the latest installation software for the S/100 from Compaq. The initial release was 1.0. There have been a few updates since then. You should use 1.01a or later update if available.
• Read the release notes for the Compaq software version you are using. In the notes ther is a suggestion about putting each TCP/IP address resource in a separate resource monitor. While in some configurations this may increase performance, in others it may create excessive overhead by having many resource monitor processes. Previous issues have shown that placing the Compaq S/100 disk resources in their own resource monitor achieves similar goals and can prevent failover problems in some configurations. Make this change after installation of the complete cluster; or after installation of the first node.
• Ensure array cables are attached according to the Compaq manual, and to array controllers located in the same slot number on each server. Beware of possible issues with dual ported controllers, as cabinets attached to dual ported controllers will both failover together, not independently.
• Ensure matching firmware on controllers attached to the same array cabinet. Check firmware revisions on the controllers in the event that they are out of date.

The installation procedure for the S/100 consists of the following basic steps that must be performed using the installation software provided by Compaq which also prompts for the Windows NT Server 4.0 Enterprise Edition CD. For best results, consult the Compaq S/100 Cluster manual as well. The basic steps to install the S/100 cluster are:

1. Install Windows NT Server 4.0, Enterprise Edition.
2. Install Windows NT Server 4.0 Service Pack 6a.
3. Install the latest Software Support Diskette (SSD) from Compaq for the S/100 hardware.
4. Choose drive letters for any attached arrays for cluster use. Make sure the same drive letters are available on the second node for these same devices. Do not allocate these drive letters to mapped network drives, CD-ROM drives, or other devices.
5. Install Compaq S/100 proprietary software.
6. Insert the correct disk when the S/100 installation prompts you for Windows NT 4.0, Enterprise Edition disk 2.
7. Choose disk resources to be managed by the cluster through the S/100 drivers.
8. When you restart the computer, the S/100 installation scans the resources.
9. Follow steps 1 through 5 on the second node to join the existing cluster.

NOTE: If you do not have the Compaq S/100 proprietary software, the shared arrays may not be visible as choices and the cluster installation may not work properly. Also, if you notice that the disk resources created are of type "Physical Disk" then this may be an indication that the Compaq software has not been used. Also, if using Windows NT 4.0 Service Pack 4 (or a later version), be sure to reapply the service pack after installing the cluster software.

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