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Basic Storage Service Configuration Guide for Block

OceanStor Dorado V3 Series V300R002

This document is applicable to OceanStor Dorado3000 V3, Dorado5000 V3, Dorado6000 V3, and Dorado18000 V3. It describes the basic storage services and explains how to configure and manage them.
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Planning Storage Pools

Planning Storage Pools

Before using a storage system, create storage pools to provide storage space. The RAID policies of the storage pools must be properly planned for better storage utilization.

Dorado V3 storage systems use dynamic RAID for redundancy and provide different levels of protection based on the number of parity bits in the RAID group. Table 3-3 describes RAID 5, RAID 6, and RAID-TP provided by storage systems when hot spare space is not considered.

Table 3-3 RAID levels

RAID Level

Number of Parity Bits

Redundancy and Data Recovery Capability

Maximum Number of Allowed Faulty Disks

RAID 5

1

Relatively high. Parity data is distributed on different chunks. In each chunk group, the parity data occupies the space of one chunk. RAID 5 is able to tolerate the failure on only one chunk. If two or more chunks fail, RAID 5 protection can no longer be provided.

1

RAID 6

2

High. Parity data is distributed on different chunks. In each chunk group, the parity data occupies the space of two chunks. RAID 6 is able to tolerate simultaneous failures on two chunks. If three or more chunks fail, RAID 6 protection can no longer be provided.

2

RAID-TP

3

High. Parity data is distributed on different chunks. In each chunk group, the parity data occupies the space of three chunks. RAID-TP is able to tolerate simultaneous failures on three chunks. If four or more chunks fail, RAID-TP fails.

3

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Updated: 2019-07-17

Document ID: EDOC1100049139

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