2
RAID levels
The supported RAID levels vary by storage controller model. For more information about the
supported RAID levels of each storage controller, see H3C Servers Storage Controllers Technical
Specifications.
Table 1 shows the minimum number of drives required by each RAID level and the maximum
number of failed drives supported by each RAID level. For more information about RAID levels, see
"Appendix B RAID arrays and fault tolerance."
Table 1 RAID levels and the numbers of drives for each RAID level
RAID 0 1 0
RAID 1 2 1
RAID 1
ADM
3 2
RAID 5 3 1
RAID 6 4 2
RAID 10 4 n, where n is the number of RAID 1 arrays in the RAID 10 array.
RAID 10
ADM
6
2n, where n is the number of RAID 1 ADMs in the RAID 10
ADMs.
RAID 50 6 n, where n is the number of RAID 5 arrays in the RAID 50 array.
RAID 60 8 2n, where n is the number of RAID 6 arrays in the RAID 60 array.
Hot spare drives
You can configure hot spare drives to improve data security. A hot spare drive is a standby drive that
does not store any data. When a drive in a redundant RAID fails, a spare drive automatically
replaces the failed drive and rebuilds the data of the failed drive.
The storage controller supports the following types of hot spare drives. For more information about
hot spare drive types, see "Storage controller features."
Dedicated spare drive.
Auto replace spare drive.
Restrictions and guidelines for RAID
configuration
As a best practice, install drives that do not contain RAID information.
To avoid degraded RAID performance or RAID creation failures, make sure all drives in the RAID
are the same type (HDDs or SSDs) and have the same connector type (SAS or SATA).
For efficient use of storage, use drives that have the same capacity to build a RAID. If the drives
have different capacities, the lowest capacity is used across all drives in the RAID.
If one drive is used by several logical drives, RAID performance might be affected and maintenance
complexities will increase.
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