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Chapter 4 Features
27
Hardware Architecture Features
Specification Feature
Processor Intel i960RN
SCSI Controller One Q-Logic 12160 Dual SCSI controllers
memory type One 64-bit 168-pin SDRAM DIMM socket provides
write-through or write-back caching on a logical
drive basis. It also provides adaptive readahead.
Size of Flash ROM 1 MB
Amount of NVRAM 32 KB
Hardware XOR assistance Yes
Direct I/O Yes
Removable battery-backed
cache memory module
Yes
SCSI bus termination Active, LVD and SE
Double-sided DIMMs Yes
Direct I/O bandwidth 266 MB/s
Array Performance Features
The MegaRAID array performance features include:
Specification Feature
Host data transfer rate 266 MB/s
Drive data transfer rate 160 MB/s
Maximum Scatter/Gathers 26 elements
Maximum size of I/O requests 6.4 MB in 64 KB stripes
Maximum Queue Tags per drive 211
Stripe Sizes 2 KB, 4 KB, 8 KB, 16 KB, 32 KB, 64
KB, or 128 KB
Maximum number of concurrent
commands
255
Support for multiple initiators Yes