Specifications

Chapter 11. Attaching to a Windows NT 4.0 host
This chapter tells you how to attach the ESS to a Windows NT host system with
SCSI or fibre-channel adapters.
Attaching with SCSI adapters
This section describes how to attach a Windows NT host system to an ESS with
the following SCSI adapters.
v Adaptec AHA-2944UW
v Symbios 8751D
v QLogic QLA1041
For procedures about how to attach an ESS to a Windows NT host system with
fibre-channel adapters, see “Attaching with fibre-channel adapters” on page 126.
Attachment requirements
This section lists the requirements for attaching the ESS to your host system:
v Check the LUN limitations for your host system; see Table 6 on page 11.
v Ensure that you have the documentation for your host system and the IBM
Enterprise Storage Server User’s Guide. The User’s Guide is on the compact
disc that you receive with the ESS.
For details about the release level for your operating system, see the following
Web site:
www.storage.ibm.com/hardsoft/products/ess/supserver.htm
Either you or an IBM service support representative (SSR) must perform the
following tasks to install and configure an ESS.
1. The IBM SSR installs the ESS by using the procedures in the IBM Enterprise
Storage Server Service Guide.
2. You assign the SCSI hosts to the SCSI ports on the ESS.
Note: Use the information on the logical configuration work sheet in the IBM
Enterprise Storage Server Configuration Planner that you should have
previously filled out.
3. You configure the host system for the ESS by using the instructions in your host
system publications.
Notes:
1. Version 1.2.1 or later of the IBM Subsystem Device Driver supports the
Windows NT 4.0 host system in a clustering environment. To have failover
protection on an open system, the IBM Subsystem Device Driver requires a
minimum of two adapters. You can run the Subsystem Device Driver with one
SCSI adapter, but you have no failover protection. The maximum number of
adapters supported is 16 for a total of 32 SCSI ports.
2. To improve performance, IBM recommends that you map to the LUNs for the
target volumes of the Windows NT host until you need access to the data on
the target volume. Perform the LUN mapping after the Peer-to-Peer Remote
Copy operation and immediately before you need access to the data. You must
restart the host system before you can access the data on the target volume.
You can greatly reduce the time it takes for the host system to restart if you
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