Ta b l e 6 - 4 . A r r a y Pe r f o r m a nc e Fe at u r e s (continued)

Specification

Feature

 

 

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

As many as the drive can accept.

 

 

Stripe sizes

2 KB, 4 KB, 8 KB, 16 KB, 32 KB,

 

64 KB, or 128 KB

 

 

Maximum number of concurrent

255

commands

 

 

 

Support for multiple initiations

Yes

 

 

Fault Tolerance Features

The fault tolerance features are listed in Table 6-5.

Ta b l e 6 - 5 . Fa u l t To l e r a n ce Fe at u r e s

Specification

Feature

 

 

Support for SMART

Yes

 

 

Optional battery backup for cache memory

Yes. Up to 72 hours data

 

retention.

 

 

Drive failure detection

Automatic

 

 

Drive rebuild using hot spares

Automatic

 

 

Manual replacement of drives without system

Yes

shutdown

 

 

 

Parity generation and checking

Yes

 

 

Software Utilities

The software utilities are listed in Table 6-6.

PERC 3/QC Features

77

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Dell 3 manual Fault tolerance features are listed in Table, Software utilities are listed in Table