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6533 - RAID Disk Unit Controller
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| $100.00 |
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The 6533 is an Ultra SCSI controller with a 4MB write-cache that provides RAID-5 protection for internal disk units. #6533 offers greater performance than #6502, #6512, and #6530. This controller is disk compression enabled. #6532 controls Ultra Fast Wide and Fast Narrow SCSI disk units installed in: #5058: Storage Expansion Unit, #5083: Storage Expansion Tower, #5064/#9364: System Unit Expansion w/ #9331: Exp Unit for SPD Cards. It will also control Ultra, F/W, and F/N SCSI disk units installed in the: #5052: Storage Expansion Unit, #5082: Storage Expansion Towers. However, to hardware limitations those disks will not be controlled at Ultra speeds. In addition to providing RAID-5 protection for disks, #6533 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 #6533 controller supports a maximum of 16 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 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 ten drives. For systems started with eight to ten drives in an array the parity, for that array, will be spread across eight drives. For systems that are started with less than eight drives in an array and later upgraded to eight, nine or ten drives the RAID function must be stopped and then started before the parity will be spread across eight drives. Disk Compression: #6533 supports hardware disk compression, enabled by the integration of data compression hardware directly into the data-flow of the controller. Data is compressed and decompressed without intervention from the AS/400 system processor. Disk compression on the 17.54GB disk units requires the support of OS/400 V4R4. Capacity gains may vary as a function of the compression algorithm and the characteristics of the data. Typically two times compression can be expected with up to four times possible. Disk compression can be used with or without BRMS Hierarchical Storage Management (HSM) as part of a total storage management strategy including high-performance disk, compressed disk, and tape automation. Compressed disks have the same disk subsystem availability options (i.e., RAID-5, mirroring) as uncompressed disks, with no additional restrictions. Disk compression is supported only in user auxiliary storage pools (user ASPs). The user selects which disk arms to compress via a new Disk Manager screen, and disk capacity screens reflect the projected disk capacity and the percent used. Due to the overhead of compression/decompression, and the variations in the length of data written to disk, the performance of compressed disk will in most cases be slower than uncompressed, high-performance disk drives. SPD card slots: One. Requires OS/400 V4R2. For models; 500, 50S, 510, 530, 53S, 620, 640, 650, 720, 730, 740, 820, 830, 840, S20, S30, S40. |
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