User`s guide

PERC 5 Features 21

RAID Configuration Information

Table 2-2 lists the configuration features for the PERC 5 controllers.

Fault Tolerance Features

Table 2-3 lists the features that provide fault tolerance to prevent data loss in case of a failed physical disk.

Table 2-2. Features for RAID Configuration

Specification PERC 5/E Adapter PERC 5/i Adapter and 5/i Integrated

Number of virtual disks

supported

Up to 64 virtual disks per controller Up to 64 virtual disks per controller

NOTE: The number of physical disks on a

controller is limited by the backplane on which

the card is attached.

Online RAID level migration Yes Yes

Disk roaming Yes Yes

No reboot necessary after

capacity expansion

Yes Yes

User-specified rebuild rate Yes Yes

Table 2-3. Fault Tolerance Features

Specification Feature

Support for SMART Yes

Support for Patrol Read Yes

Physical disk failure detection Automatic

Physical disk rebuild using hot spares Automatic

Parity generation and checking (RAID 5 only) Yes

Battery backup for controller cache to protect configuration data Yes

Hot-swap manual replacement of a physical disk unit without bringing the system down Yes

The PERC 5/i Adapter supports a battery backup unit (BBU) on selected systems only. For additional information,

see documentation that was shipped with the system.

Dell_PERC5_UG.book Page 21 Tuesday, February 13, 2007 6:02 PM