36 About PERC 6 and CERC 6/i Controllers
Fault Tolerance Features
Table 3-3 lists the features that provide fault tolerance to prevent data loss in
case of a failed physical disk.
Physical Disk Hot Swapping
Hot swapping is the manual replacement of a defective unit in a disk
subsystem while the subsystem is performing its normal functions.
NOTE: The system backplane or enclosure must support hot swapping for the
PERC 6 and CERC 6/i controllers to support hot swapping.
NOTE: Replace a physical disk with a new one of the same protocol and
drive technology. For example, only a SAS HDD can replace a SAS HDD;
only a SATA SSD can replace a SATA SSD.
NOTE: The replacement drive must be of equal or greater capacity than the one it
is replacing.
Table 3-3. Fault Tolerance Features
Specification PERC CERC
Support for SMART Yes Yes
Support for Patrol Read Yes Yes
Redundant path support Yes
a
a. Supported only on PERC 6/E adapters.
N/A
Physical disk failure detection Automatic Automatic
Physical disk rebuild using hot spares Automatic Automatic
Parity generation and checking (RAID 5, 50, 6, and 60 only) Yes Yes
Battery backup of controller cache to protect data Yes
b
b. The PERC 6/i adapter supports a BBU on selected systems only. For additional information, see
the documentation that was shipped with the system
N/A
Manual learn cycle mode for battery backup Yes N/A
Detection of batteries with low charge after boot up Yes N/A
Dell_PERC6.2_UG.book Page 36 Wednesday, June 24, 2009 6:08 PM
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