Fault Tolerance Features

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

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

Yes

N/A

60 only)

 

 

 

 

 

Battery backup of controller cache to protect data

Yesa

N/A

 

 

 

Manual learn cycle mode for battery backup

Yes

N/A

 

 

 

Detection of batteries with low charge after

Yes

N/A

bootup

 

 

 

 

 

Hot-swap manual replacement of a physical disk

Yes

Yes

without reboot

 

 

aThe PERC 6/i adapter supports a BBU on selected systems only. For additional information, see the documentation that was shipped with the system.

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.

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About PERC 6 and CERC 6i Controllers

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Dell UCP-61, UCC-60, UCP-60 manual Physical Disk Hot Swapping, Fault Tolerance Features Specification
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UCP-61, UCP-60, UCC-60 specifications

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