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Dell PowerEdge RAID Controller 11 User’s Guide PERC H755, H750, H355, and H350 Controller Series

Summary of RAID levels

Following is a list of the RAID levels supported by the PERC 11 series of cards:

  • RAID 0 uses disk striping to provide high data throughput, especially for large files in an environment that requires no data redundancy.
  • RAID 1 uses disk mirroring so that data written to one physical disk is simultaneously written to another physical disk. RAID 1 is good for small databases or other applications that require small capacity and complete data redundancy.
  • RAID 5 uses disk striping and parity data across all physical disks (distributed parity) to provide high data throughput and data redundancy, especially for small random access.
  • RAID 6 is an extension of RAID 5 and uses an additional parity block. RAID 6 uses block-level striping with two parity blocks distributed across all member disks. RAID 6 provides protection against double disk failures, and failures while a single disk is rebuilding. If you are using only one array, deploying RAID 6 is more effective than deploying a hot spare disk.
  • RAID 10 is a combination of RAID 0 and RAID 1, uses disk striping across mirrored disks. It provides high data throughput and complete data redundancy.
  • RAID 50 is a combination of RAID 0 and RAID 5 where a RAID 0 array is striped across RAID 5 elements. RAID 50 requires at least six disks.
  • RAID 60 is a combination of RAID 0 and RAID 6 where a RAID 0 array is striped across RAID 6 elements. RAID 60 requires at least eight disks.

The following table lists the minimum and maximum disks supported on each RAID levels.

Table 1. Minimum and maximum disks supported on each RAID levelsThis table describes the minimum and maximum disks supported on each RAID levels.
RAID Level Minimum disk Maximum disk
0 1 32
1 2 2
5 3 32
6 4 32
10 4 240
50 6 240
60 8 240
NOTE:The maximum number of virtual disks is currently limited to 192, because of the supported enclosure configuration.

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