Logic MegaRAID SCSI 320-2 RAID Controller User's Guide

4-2 Features

• SCSI data transfers up to 320 Mbytes/s

• Synchronous operation on a wide LVD SCSI bus

• Up to 15 LVD SCSI devices on each of the Wide buses

• Up to 256 Mbytes of 3.3 V PC100 (or faster) SDRAM cache memory

in one single-sided or double-sided DIMM socket (Cache memory is

used for read and write-back caching and for RAID 5 parity

generation.)

• Non-volatile random access memory (NVRAM) storage for RAID

conﬁguration data

• Audible alarm

• Direct memory access (DMA) chaining support

• Separate DRAM bus

• Support for differential or single-ended SCSI with active termination

• Up to 12 MegaRAID 320-2 cards per system

• Support for up to 15 SCSI devices per channel

• Support for RAID levels 0, 1, 5, 10, and 50

• Support for scatter/gather and tagged command queuing

• Ability to multithread up to 256 commands simultaneously

• Support for multiple rebuilds and consistency checks with

transparent user-deﬁnable priority setting

• Support for variable stripe sizes for all logical drives

• Automatic detection of failed drives

• Automatic and transparent rebuild of hot spare drives

• Hot swap of new drives without taking the system down

• Optional battery backup for up to 72 hours of data retention

• Server clustering support

• Optional ﬁrmware provides multi-initiator support

• Server failover

• Software drivers for major operating systems