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Dell PowerEdge RAID Controller (PERC)

Dell PowerEdge RAID Controller (PERC)
Simplify Your Servers
The DellTM  PERC (PowerEdgeTM  RAID Controller) family of enterprise-class controllers is designed for enhanced performance, increased reliability and fault tolerance, and simplified management—providing a powerful, easy-to-manage way to create a robust infrastructure and help maximize server uptime.
Level/DescriptionFault ToleranceAdvantageDisadvantage
RAID 0
Maps data across the drives to create large virtual disks. Provides improved performance because each physical disk handles only part of the request. However, one drive failure makes the VD inaccessible and the data is lost permanently.
RAID 0EnlargeNoneImproved performance
Additional storage
Should not be used for critical data
RAID 1
Mirrors data, where data is stored redundantly across two drives. If one disk fails, the other takes over and functions as the primary drive.
RAID 1EnlargeDisk errors
Single disk failures
High read performance
Fast recovery after drive failure
Data redundancy
High disk overhead
Limited capacity
RAID 5
Maps data across drives and stores parity bits for each data stripe on different drives in the VD. Parity bits contain information that enable a disk’s data to be re-created from the remaining disks in the event of single disk failure.
RAID 5EnlargeDisk errors
Single disk failures
Efficient use of drive capacity
High read performance
Med-to-High write performance
Disk failure medium impact
Longer re-build due to parity re-calculation
RAID 6
Maps data across drives and stores parity bits for each data stripe on different drives in the VD. Unlike RAID 5, RAID 6 makes two parity calculations – P & Q – enabling it to withstand dual disk failures.
RAID 6EnlargeDisk errors
Dual disk failures
Data redundancy
High read performance
Write performance decrease due to dual parity calculations
Extra cost due to 2 disk equivalent devoted to parity
RAID 10
Stripes over mirrored sets. High disk overhead, but excellent solution for those requiring high performance & redundancy plus the fastest recovery in the event of drive failure.
RAID 10EnlargeDisk errors
One disk failure per mirrored set
High read performance
Supports largest RAID group of 192 drives
Most expensive
RAID 50
Stripes over RAID 5 sets. A performance increase over RAID 5 may be realized, depending on the configuration, due to fewer disk reads per parity calculation.
RAID 50EnlargeDisk errors
Single disk failure per span
High read performance
Med-to-High write performance
Supports largest RAID group of 192 drives
Disk failure medium impact
Longer re-build due to parity re-calculation
RAID 60
Stripes over RAID 5 sets. A performance increase over RAID 6 may be realized, depending on the configuration, due to fewer disk reads per parity calculation.
RAID 60EnlargeDisk errors
Dual disk failure per span
High read performance
Supports largest RAID group of 192 drives
Write performance decrease due to dual parity calculations
Extra cost due to 2 disk equivalent devoted to parity

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