
28 Netfinity and Windows 2000 Integration Guide
2.2 ServeRAID SCSI adapters
IBM mainstream SCSI RAID adapters are the ServeRAID family. This section
describes the adapters that are currently available.
Figure 12. ServeRAID-3HB adapter
There are currently three versions of the ServeRAID adapters available from IBM:
• The Netfinity ServeRAID-3HB Ultra2 SCSI Adapter (part 37L6086)
• The Netfinity ServeRAID-3H Ultra2 SCSI Adapter (part 01K7207)
• The Netfinity ServeRAID-3L Ultra2 SCSI Adapter (part 01K7364)
These replace previously available ServeRAID adapters:
• IBM ServeRAID II Ultra SCSI Adapter (part 76H3584)
• IBM PC ServeRAID SCSI Adapter (part 70G8489)
For more information beyond that covered in this section, see the redbook
Implementing Netfinity Disk Subsystems: ServeRAID SCSI, Fibre Channel and
SSA, SG24-2098.
Also, refer to 6.1, “ServeRAID update and management tool” on page 85.
2.2.1 Arrays and logical drives
To configure usable disk space on ServeRAID-attached disks, you must first
configure RAID arrays and logical drives. Redundant array of independent disks
(RAID) is the technology of grouping several disk drives in a server into a RAID
array that you can define as one or more logical drives. Each logical drive then
appears to the operating system as a single physical drive (for example, Disk 0,
Disk 1, and so on, for Windows NT).
When you group multiple disk drives into a single logical drive, the ServeRAID
controller is able to transfer data from these multiple disk drives in parallel,
thereby yielding much higher data transfer rates than that of a single disk. For
more information about RAID and the options available with the ServeRAID
adapter, see Appendix A of Implementing Netfinity Disk Subsystems: ServeRAID
SCSI, Fibre Channel and SSA, SG24-2098.
As explained, the ServeRAID-3H and ServeRAID-3HB adapters have three SCSI
channels (the ServeRAID-3L has one). The ServeRAID allows the configuring of
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