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Huawei V2 and V3 Server RAID Controller Card User Guide 36

This document describes the appearances and features of the redundant array of independent disks (RAID) controller cards, how to configure properties for the RAID controller cards, and how to install drivers. The RAID controller cards include the LSI SAS2208, LSI SAS2308, LSI SAS3008, LSI SAS3108, LSI SoftRAID, PM8060, and PM8068.
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Storage Capacity

Storage Capacity

Storage capacity is an important factor for RAID level selection.

RAID 0: With the same circumstances for a specified group of drives, RAID 0 provides the maximum storage capacity. Available storage capacity = Minimum capacity of a member drive x Number of member drives

RAID 1: When data is written into a drive, the data must also be written into the other drive in the same pair, which consumes storage space. Available storage capacity = Minimum capacity of a member drive

RAID 5: One check data block is isolated from common data blocks. Therefore, check data occupies the capacity of one member drive. Available storage capacity = Minimum capacity of a member drive x (Number of member drives – 1)

RAID 6: Two check data blocks are isolated from common data blocks. Therefore, check data occupies the capacity of two member drives. Available storage capacity = Minimum capacity of a member drive x (Number of member drives – 2)

RAID 10: Available storage capacity = Minimum capacity of a member drive x Number of member drives/2

RAID 50: Available storage capacity = Storage capacity of spans x Number of spans

RAID 60: Available storage capacity = Storage capacity of spans x Number of spans

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Updated: 2019-11-01

Document ID: EDOC1000004186

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