Instruction Manual

Storage Controller Features 33
NOTE: The total number of physical disks in a disk group cannot exceed 32. You
cannot perform RAID level migration and/or expansion on RAID levels 10, 50, and
60.
Fault Tolerance Features
The list of features of the controller cards that provide fault tolerance to
prevent data loss is as follows:
• Support for SMART
• Support for Patrol Read
• Redundant path support (for PERC H800 only)
• Physical disk failure detection
• Physical disk rebuild using hot spares
• Parity generation and checking (for RAID 5, 50, 6, and 60 only)
RAID 5 RAID 6 3 or more 4 or more Yes At least one disk needs
to be added for dual
distributed parity data.
RAID 6 RAID 0 4 or more 4 or more Yes Converts to a
non-redundant
virtual disk and
reclaims disk space
used for distributed
parity data.
RAID 6 RAID 5 4 or more 4 or more Yes Removes one set of
parity data and
reclaims disk space
used for it.
RAID 6 RAID 6 4 5 or more Yes Increases capacity by
adding disks
Table 3-2. RAID Level Migration
(continued)
Source
RAID
Level
Target
RAID
Level
Required
Number of
Physical Disks
(Beginning)
Number of
Physical
Disks (End)
Capacity
Expansion
Possible
Description
PERC7.2_UG.book Page 33 Thursday, March 3, 2011 2:14 PM