I/O Adapter 267
I/O Adapter
#2748 PCI RAID Disk Unit Compression Controller
The #2748 is an Ultra2 SCSI disk and tape controller with a 26 MB write cache that provides
RAID-5 protection for internal disk units. In addition to RAID, the #2748 also offers DASD
compression capabilities. The #2748 IOA is shipped with compression disabled. Compression is
enabled by moving a jumper on the IOA. The #2748 supports Extended Adaptive Cache with
restriction that compression must not be active on the same #2748 subsystem.
The #2748 is designed to control Ultra2, Ultra, and Fast Wide SCSI disk units. It supports up
to 15 disk units, one CD-ROM, and one internal tape unit. In addition to RAID-5 and
compression, the #2748 is also designed to work as a high performance controller for disks
protected by system mirroring or disks with no protection. In the RAID-5 configuration, disk
unit protection is provided at a lower cost than mirroring. This feature supports Concurrent
DASD Add/Maintenance. Note the following additional points:
• The #2748 is a replacement for #2741.
• High Speed PCI Card slots required: One.
• This feature is CE
installation only
.
#9728 Base PCI Disk Unit Controller Ultra SCSI
The #9728 Base PCI Disk Unit Controller is the base controller. It is an Ultra SCSI controller,
which provides mirroring or unprotected support for up to five disks. The #9728 does not
include any write cache, and it does not support RAID. As well as five disks, it also supports
the internal CD-ROM drive and one internal tape unit.
The #9728 controls Ultra, Fast Wide, and Fast Narrow SCSI disk units. The Ultra SCSI disks
provide the best performance when attached to the #9728. These Ultra SCSI disks are
17.54G Disk Unit #6824, 8.58G Disk Unit #6813, 4.19G Disk Unit #6807, 1.96G Disk Unit
#6806, and their base disk equivalents and the #1334 (17.54G), #1333 (8.58G), #1337
(4.19G) and #1336 (1.96G) Disk Unit Migration Kits. The #9728 also controls migrated disks
that are not Ultra SCSI. In that case, the disks do not perform at Ultra SCSI speeds.
The Base PCI Disk Unit Controller supports a maximum of five one- or two-byte disk units. It
is represented in the rack configuration list as CCIN 2728. The #9728 is supported for
migration only.
Migration Tower Hardware SPD
#2620 Cryptographic Processor
The Cryptographic Processor #2620 performs cryptographic functions based on a hardware
implementation of the ANSI Data Encryption Standard (DES), and the Rivest, Shamir, and
Adleman (RSA) Public Key Algorithm. Functions provided include encryption and decryption
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