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OceanStor 18500 V3 and 18800 V3 Mission Critical Storage System V300R003 Basic Storage Service Guide for File 16

"This document describes the basic storage services and explains how to configure and managebasic storage services."
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Planning a File System

Planning a File System

Before using a storage system, properly plan the application scenario, checksum, Atime, quota, capacity, snapshot space ratio, and WORM ensure optimal storage system performance.

File System Parameter Planning

Table 2-10 lists each parameter of a file system.
Table 2-10  File system parameter planning

Parameter

Function

Value

Application Scenario

Data in the file system consists of fixed-length disk blocks. The size of the blocks (also known as file system block size) affects disk space usage and performance. You can advised to use the block size following the principles below.
  • Based on the file size:
    • Select 4 KB when the size of most files in the file system is smaller than 100 KB.
    • Select 8 KB when the size of most files in the file system is between 100 KB and 1 MB.
    • Select 16 KB when the size of most files in the file system is between 1 MB and 100 MB.
    • Select 32 KB when the size of most files in the file system is between 100 MB and 1 GB.
    • Select 64 KB when the size of most files in the file system is larger than 1 GB.
  • Based on the I/O models of your business scenarios:
    • If your business scenario is with big I/O, such as media, big file archive/backup or backup virtual machine by backup software, you are advised to select 64 KB of block size.
    • If your business scenario is with small I/O, such as small file archive/backup, virtual machine file system or database, you are advised to select 4 KB of block size.

The value can be 4 KB, 8 KB, 16 KB, 32 KB, and 64 KB.

The default value is 64 KB.

Checksum

The Checksum function is used to check data when the data is being read or written to ensure its integrity. This function is disabled when the data integrity requirement is moderate.

By default, Checksum is enabled.

Atime

The Atime function is used to update file system access time. Atime updates file system time upon each data read and write, and records file system access time. This function affects system performance because data can be read or written in a serial manner.

By default, Atime is disabled.

Quota

The file system allows quotas to be configured in a shared quota tree. A quota restricts the file quantity and storage space size in a quota tree. A quota can be soft and hard.
  • For file quantity, a hard quota refers to the maximum number of files created in a quota tree, while, a soft quota refers to an alarm threshold of file quantity.
  • For storage space, a hard quota refers to the maximum capacity of storage space in a quota tree, while, a soft quota refers to an alarm threshold in quota tree space.
If the capacity value or number of files that a user created exceeds the soft quota, the creation will succeed but an alarm is returned. If the capacity value or number exceeds the hard quota, the creation will fail and a failure event is returned. The type of the file system can be Directory Quota, User Quota or User Group Quota.
  • If you want to restrict the space used by files or the number of files in the root directory, select Directory quota.
  • If you want to restrict the space used by files or the number of user, select User Quota.
  • If you want to restrict the space used by files or the number of user group, select User Group Quota.
Root Quota Tree is the quota tree created for the file system by default. This quota tree cannot be deleted and you cannot modify its name. Root Quota Tree is only available when creating user quota or user group quota for file system. It is not available for directory quota.

The quota value is blank.

Capacity

Capacity size of a file system to be created.

This parameter is:
  • Optional when the default Thin file system is selected during the creation.
  • Mandatory when the default Thin file system is not selected during the creation.

Snapshot Space Ratio

By default, 20% of storage system capacity is reserved for snapshots. You can change the value in the Advanced property of the file system.

The default value is 20%.

WORM

WORM parameters, the WORM file system ensures the file after being written into the file system, cannot be modified, deleted, or migrated within the specific WORM protection period but can be read multiple times.

By default, WORM is disabled.

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Updated: 2019-08-14

Document ID: EDOC1000084081

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