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OceanStor 2600 V3 Video Surveillance Edition V300R006 Basic Storage Service Configuration Guide for File

This document is applicable to OceanStor OceanStor 2600 V3 Video Surveillance Edition. This document describes the basic storage services and explains how to configure and manage basic storage services for storage system.
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Planning Storage Pools

Planning Storage Pools

This section describes how to plan storage pools, including RAID levels based on site requirements.

Consider the following when selecting RAID levels:

  • Reliability
  • Read/Write performance
  • Disk utilization

Different RAID levels provide different reliability, read/write performance, and disk utilization, as described in Table 2-6.

Table 2-6 RAID levels

RAID Level

Redundancy and Data Recovery Capability

Read Performance

Write Performance

Disk Utilization

Maximum Number of Allowed Faulty Disks

RAID 0

No data redundancy is provided and corrupted data cannot be recovered.

High

High

100%

0

RAID 1

High. RAID 1 provides complete redundancy. When a CK fails, the mirror CK can be used for data recovery.

Relatively high

Relatively low

  • 2Da: about 50%
  • 4D: about 25%

N-1 (in a RAID 1 disk array with N disks).

RAID 3

Relatively high. Each CKG has one CK as the parity CK. Data on any data CK can be recovered using the parity CK. If two or more CKs fail, RAID 3 protection can no longer be provided.

High

Low

RAID 3 supports flexible configurations. Specifically, a RAID 3 policy allows data block and parity block policies ranging from 2D+1P to 13D+1P. The following examples show disk utilization of several configurations commonly used by RAID 3:

  • 4D+1Pb: about 80%
  • 2D+1P: about 66.67%
  • 8D+1P: about 88.89%
NOTE:

For a flexibly configured RAID policy xD+yP, the disk utilization is [x/(x + y)] x 100%.

1

RAID 5

Relatively high. The parity data is distributed on different CKs. In each CKG, the parity data occupies space of a CK. RAID 5 allows the failure of only one CK. If two or more CKs fail, RAID 5 protection can no longer be provided.

Relatively high

Relatively high

RAID 5 supports flexible configurations. Specifically, a RAID 5 policy allows data block and parity block policies ranging from 2D+1P to 13D+1P. The following examples show disk utilization of several configurations commonly used by RAID 5:

  • 2D+1P: about 66.67%
  • 4D+1P: about 80%
  • 8D+1P: about 88.89%
NOTE:

For a flexibly configured RAID policy xD+yP, the disk utilization is [x/(x + y)] x 100%.

1

RAID 6

Relatively high. Two groups of parity data are distributed on different CKs. In each CKG, the parity data occupies space of two CKs. RAID 6 allows two CKs to fail simultaneously. If three or more CKs fail, RAID 6 protection can no longer be provided.

Medium

Medium

RAID 6 supports flexible configurations. Specifically, a RAID 6 policy allows data block and parity block policies ranging from 2D+2P to 26D+2P. The following examples show disk utilization of several configurations commonly used by RAID 6:

  • 2D+2P: about 50%
  • 4D+2P: about 66.67%
  • 8D+2P: about 80%
  • 16D+2P: about 88.89%
NOTE:

For a flexibly configured RAID policy xD+yP, the disk utilization is [x/(x + y)] x 100%.

2

RAID 10

High. RAID 10 allows multiple CKs to fail simultaneously. When a CK fails, the mirror CK can be used for data recovery. If a CK and its mirror CK fail simultaneously, RAID 10 protection can no longer be provided.

Relatively high

Relatively high

50%

N (in a RAID 10 disk array with 2N disks).

RAID 50

Relatively high. The parity data is distributed on different CKs of each RAID 5 sub-group. In each RAID 5 sub-group, only one CK is allowed to fail. If two or more CKs of a RAID 5 sub-group fail simultaneously, RAID 50 protection can no longer be provided.

Relatively high

Relatively high

  • (2D+1P) x 2: about 66.67%
  • (4D+1P) x 2: about 80%
  • (8D+1P) x 2: about 88.89%

1

a: D indicates a data block.

b: P indicates a parity block.

You are advised to use NL-SAS or SATA disks to create RAID 6, and ensure that NL-SAS and SATA disks are in different storage pools.

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Updated: 2019-07-12

Document ID: EDOC1100021203

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