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technische Beschreibung:
The #4748/#9748 is an Ultra2 SCSI disk unit controller with a 26 MB write-cache that
provides RAID-5 protection for internal disk units and also supports internal tape and
CD-ROM units. The #4748/#9748 supports both compression and non-compression modes.
The mode of operation is determined by a hardware jumper, which is in the non-compression
mode position when shipped. By moving the hardware jumper, the controller will function in
compression mode.
In addition to providing RAID-5 protection for disks, the #4748/#9748 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 less cost than mirroring and with greater performance than system checksums.
The #4748/#9748 controller supports a maximum of 18 drives. A minimum of four drives of the same capacity are needed for a valid RAID-5 configuration. A maximum of four arrays are allowed, with a maximum of ten drives allowed per array. All drives in an array must be of the same capacity.
The #4748/#9748 also supports two removable media devices. This feature supports the
#4331 1.6 Gb Read Cache Drive for increased performance. The Read Cache Drive #4331 is
only supported in non-compression mode.