PCI-X Dual Channel Ultra320 SCSI RAID Adapter

Model: 1975

IBM PCI-X Dual Channel Ultra320 SCSI RAID Adapter - Storage controller (RAID) - 2 Channel - Ultra320 SCSI - 320 MBps - RAID 0, 5, 10 - PCI-X

The PCI-X Dual Channel Ultra320 SCSI RAID Adapter is a 64-bit 3.3 volt, bootable high performance Ultra320 SCSI RAID Adapter providing RAID 0, 5, or 10 capability and can address up to thirty 16-bit SCSI physical disk drives on two independent SCSI buses. To increase the data writing performance, a 40 MByte non-volatile fast-write cache is provided as a resident part of this adapter. The 40 MByte fast-write cache can provide a significant improvement in data throughput and response time during certain sequence write operations compared to SCSI RAID adapters without the fast-write cache. The response time and data transfer improvement will vary depending upon the data block sizes, the percentage of sequential writes, machine type/model, and application parameters. The Dual Channel Ultra320 SCSI RAID Adapter has two independent ultra320 SCSI buses. There are two internal ports and two external ports. The two internal ports are shared with the two external ports. The SCSI busses can drive either an internal port or an external port. The internal ports can be used to provide an internal RAID solution on certain supporting pSeries systems with internal multiple disk drives or packs of drives. Internally attached Ultra320 devices are designed to run at a data rate of up to 320 MB per second on systems that have internal backplanes that are capable of supporting Ultra320 speeds. In order to achieve an Ultra320 SCSI bus data rate of up to 320 MB per second and also maintain a reasonable drive distance, the adapter utilizes Low Voltage Differential (LVD) drivers and receivers. To fully utilize this 320 MB per second performance, all attaching devices should also be Ultra320 LVD devices. But, if Ultra2, Ultra3, or Ultra320 devices coexist on the same bus, each device will operate at its rated speed. For lower speed single-ended (SE) devices, the SCSI bus will switch to single-ended (SE) performance and interface to all devices on that SCSI bus at the lower SE bus data rate of the device.

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