(#2741) PCI RAID Disk Unit Controller

(#2741) PCI RAID Disk Unit Controller (170, 720, 5065, 6XX, Sxx) An Ultra SCSI disk and tape controller with a 4MB write-cache that provides RAID-5 protection for internal disk units. Disk compression for the 17.54GB drives requires the support of OS/400 V4R4. #2741 controls Ultra, Fast Wide and Fast Narrow SCSI disk and tape units that are installed in the base system unit and the System Unit Expansion #5064/#9364 with Expansion Unit for PCI cards #9329. In addition to providing RAID-5 protection for disks, #2741 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 #2741 controller supports a maximum of 15 drives. A minimum of four drives of the same capacity are needed for a valid RAID-5 configuration. A maximum of three arrays are allowed per controller, with a maximum of 10 drives allowed per array. All drives in an array must be of the same capacity. Parity is spread across four drives for arrays of four to seven drives. Parity can be spread across either four or eight drives for arrays of eight to 10 drives. For systems started with eight to 10 drives in an array, the parity for that array will be spread across eight drives. For systems started with less than eight drives in an array and later upgraded to eight, nine, or 10 drives the raid function must be stopped and then started before the parity will be spread across eight drives. The #2741 also supports one CD-ROM and one internal tape unit when placed in the system unit. When placed in the #5064/#9364 System Unit Expansion, the #2741 can support up to three internal tape/CD-ROM units. Refer to Disk Unit Table for a list of disks that can be placed into RAID-5 arrays. Refer to Tape Unit Table for a list of tapes that can be supported by the #2741. Prerequisite: System unit or #5064/#9364 with #9329. High-Speed PCI card slots: One. Maximum: One #9728/#2726/#2740/#2741 in the system unit. One #2726/#2741 in the #9329.

(#2741) PCI RAID Disk Unit Controller

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