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Basic Storage Service Guide for File 16

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R003

"This document describes the basic storage services and explains how to configure and managebasic storage services."
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Setting the Advanced Properties of a File System

Setting the Advanced Properties of a File System

This operation enables you to configure the advanced properties of a file system.

Prerequisites

When you are creating a file system, you can configure its advanced properties.

Procedure

  1. Log in to DeviceManager.
  2. Choose Provisioning > File System.
  3. Click Create.

    The Create File System page is displayed.

  4. Set advanced properties for the file system.
    1. Click Advanced.

      The Advanced page is displayed.

    2. Click Properties tab to set advanced properties of the file system.

      Table 5-2 describes related parameters.
      Table 5-2  Advanced properties of a file system

      Parameter

      Description

      Value

      Owning Controller

      Controller to which the file system belongs.
      NOTE:

      To allocate file systems to controllers for load balancing, you are advised to select Auto select.

      [Value range]

      Based on actual conditions of available controllers of the storage device.

      [Example]

      Auto select

      [Default]

      Auto select

      File System Block Size

      Size of the block data which make up the file system.

      [Value range]

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

      [Default]

      64 KB

      Capacity Alarm Threshold (%)

      Alarm threshold of the file system capacity.

      [Value range]

      The value is an integer ranging from 50 to 95.

      [Example]

      90

      [Default]

      90

      Initial Capacity Allocation Policy

      Policy for the storage tier to allocate capacity to a file system.
      • Automatic allocation: The storage system automatically allocates capacity to a file system based on the ratio of the available capacity of the performance tier to that of the capacity tier. Capacity is allocated from the high performance tier only when the capacity of the performance tier and capacity tier is insufficient.
      • Allocate from the high-performance tier first: The storage system allocates capacity to a file system from the high performance tier first. If the capacity of the high performance tier is insufficient, the storage system allocates capacity from the other storage tiers, first from the performance tier and then from the capacity tier.
      • Allocate from the performance tier first: The storage system allocates capacity to a file system from the performance tier first. If the capacity of the performance tier is insufficient, the storage system allocates capacity from the other storage tiers, first from the capacity tier and then from the high performance tier.
      • Allocate from the capacity tier first: The storage system allocates capacity to a file system from the capacity tier first. If the capacity of the capacity tier is insufficient, the storage system allocates capacity from the other storage tiers, first from the performance tier and then from the high performance tier.

      [Value range]

      The value can be Automatic allocation, Allocate from the high-performance tier first, Allocate from the performance tier first, or Allocate from the capacity tier first.

      [Example]

      Automatic allocation

      [Default]

      Automatic allocation

      Snapshot Directory Visibility

      Specifies whether snapshot directories are visible.

      [Value range]

      The value can be Visible or Invisible.

      [Example]

      Visible

      [Default]

      Visible

      Snapshot Space Ratio (%)

      Space ratio of the file system snapshot.

      [Value range]

      The value is an integer ranging from 0 to 50.

      [Example]

      20

      [Default]

      20

      Max. Number of Timing Snapshots

      Upper limit of the file system timing snapshots. When the number of created snapshots reaches the upper limit, the system automatically deletes the earliest timing snapshots.

      [Value range]

      The value is an integer ranging from 1 to 2048.

      [Example]

      16

      [Default]

      16

      Delete Obsolete Read-Only Snapshots

      Specifies whether Delete Obsolete Read-Only Snapshots is enabled. When used space of a file system reaches the Capacity alarm threshold and used space of snapshots is larger than reserved space for snapshots, the system automatically deletes the earliest read-only snapshots.

      [Example]

      Enable

      [Default]

      Disable

      Checksum

      Specifies whether Checksum is enabled. This function is used to check data integrity. When it is enabled, checksum will be automatically calculated when data is being written, ensuring integrity of the data to be accessed.

      [Example]

      Enable

      [Default]

      Enable

      Automatic Update of Atime

      Specifies whether Automatic Update of Atime is enabled. Atime is a time when file systems are accessed. After this function is enabled, Atime will be updated every time data on file systems is accessed.

      [Example]

      Enable

      [Default]

      Disable

  5. Click OK.

    The Create File System page is displayed.

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Updated: 2019-08-14

Document ID: EDOC1000084198

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