Dell DC, 3, User Manual

Page: 69 / 254

PERC 3/DC and PERC 3/DCL Features 67
Array Performance Features
Table 5-4 displays the PERC 3/DC and PERC 3/DCL array performance
features.
Fault Tolerance Features
Table 5-5 lists the fault tolerance features.
Ta b l e 5 - 4 . A r r a y P e r f o r m a n c e Fe a t u r e s
Specification Feature
Host data transfer rate 533 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 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
Ta b l e 5 - 5 . Fa u l t To l e r a n c e Fe a t 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 hard drives without system
shutdown
Yes
Parity generation and checking Yes