H3C UniServer E3200 G3, Руководство пользователя

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Configuring an HBA-LSI-9311-8i storage
controller
About the HBA-LSI-9311-8i storage controller
The HBA-LSI-9311-8i storage controller supports 12-Gbps data channels. For storage controller
details, contact Technical Support.
Features
RAID levels
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 level Min. drives required Max. failed drives
RAID 0 2 0
RAID 1 2 1
RAID 1E 3
Integer part of n /2, where n is the number of drives in the RAID
1E array.
RAID 10 4 n , where n is the number of RAID 1 arrays in the RAID 10 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.
For information about types of hot spare drives, see hot spare drives in "Storage controller
features."
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.