(#0648) PCI-X Disk Ctlr-90MB No IOP<p>Provides a PCI-X SCSI disk controller that has a 90MB write cache and can provide RAID-5 or RAID-6 protection of disk units. <p><p>The #0648 has two U320 SCSI buses each with a bus data rate of up to 320MBs. A maximum of 12 internal disk drives and up to two internal removable media devices (tape, optical libraries, CD-ROM, DVD-ROM, or DVD-RAM) are supported on the #0648. <p><p>A minimum of three disk drives are required for RAID-5, providing protection against a single drive failure in an array. A minimum of four disk drives are required for RAID-6, providing protection against up to two drives failing in an array. <p><p>#0648, #5737, and #5776 are physically the same adapter card but have different feature numbers to indicate to IBM configurator tools how the card is being used. #0648 indicates that the card is dedicated to an AIX 5L or Linux partition and an IOP is not being used. <p><p>Note the #2780/#5580 and #2757/#5581 disk controllers with an effective 757MB write cache provide greater disk performance and can have an auxiliary write cache IOA to protect the write cache contents. <p>Supported on the following systems: 520, 550, 570, 595
