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PERC 3/QC Features 77
Fault Tolerance Features
The fault tolerance features are listed in Table 6-5.
Software Utilities
The software utilities are listed in Table 6-6.
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
commands
255
Support for multiple initiations Yes
Table 6-5. Fault Tolerance Features
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
shutdown
Yes
Parity generation and checking Yes
Table 6-4. Array Performance Features
(continued)
Specification Feature