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36 About PERC 6 and CERC 6i 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 substitution of a replacement unit in a disk
subsystem for a defective one. The manual substitution can be performed while
the subsystem is performing its normal functions.
NOTE: The system backplane or enclosure must support hot swapping in order for
the PERC 6 and CERC 6/i controllers to support hot swapping.
NOTE: Ensure that SAS drives are replaced with SAS drives, and SATA drives are
replaced with SATA drives.
NOTE: While swapping a disk, ensure that the new disk is of equal or greater
capacity than the disk that is being replaced.
Table 3-3. Fault Tolerance Features
Specification PERC CERC
Support for SMART Yes Yes
Support for Patrol Read Yes Yes
Redundant path support Yes 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 N/A
Battery backup of controller cache to protect data Yes
a
N/A
Manual learn cycle mode for battery backup Yes N/A
Detection of batteries with low charge after
bootup
Yes N/A
Hot-swap manual replacement of a physical disk
without reboot
Yes Yes
a
The PERC 6/i adapter supports a BBU on selected systems only. For additional information, see
the documentation that was shipped with the system.
Dell_PERC6.1_UG.book Page 36 Wednesday, April 15, 2009 4:18 PM