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Basic Storage Service Configuration Guide for File

OceanStor V3 Series V300R006

This document is applicable to OceanStor 2200 V3, 2600 V3, 5300 V3, 5500 V3, 5600 V3, 5800 V3, 6800 V3, 18500 V3, and 18800 V3. It describes the basic storage services and explains how to configure and manage them.
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Modifying Advanced Properties of a File System

Modifying Advanced Properties of a File System

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

Prerequisites

At least one file system has been created.

Procedure

  1. Log in to DeviceManager.
  2. Choose Provisioning > File System.
  3. Select a file system whose advanced properties you want to modify and click Properties.

    The File System Properties page is displayed.

  4. Change advanced properties of the file system.

    1. Select Advanced in the More tab.
    2. Change advanced properties of the file system.
      Table 5-8 describes related parameters.
      Table 5-8 Advanced properties of a file system

      Parameter

      Description

      Value

      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

      SSD Capacity Upper Limit of User Data

      Set the SSD capacity upper limit of user data.

      NOTE:
      • The storage pool where the file system is created must contain SSDs and other storage media.
      • When the capacity of other storage media in the storage pool is used up, the SSD capacity used by user data may exceed the specified upper limit.
      • If the SSD capacity upper limit of user data is greater than the file system capacity after file system capacity reduction, the SSD capacity used by user data will not exceed the total file system capacity.
      • This parameter applies to V300R006C30 and later versions.
      [Value range]
      • The SSD capacity upper limit of user data cannot be smaller than 1 GB.
      • The SSD capacity upper limit of user data cannot exceed the capacity of the file system.

      Initial Capacity Allocation Policy

      Policy for a 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 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 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 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

      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.

      You can enable the Delete Obsolete Read-Only Snapshot function, so that when the file system's used space reaches the alarm threshold and the space used by snapshots is larger than the snapshot reservation space (source file system capacity x Snapshot Space Ratio (%)), the storage 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. After 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

      ADS

      Allows a file to have multiple flows to store a large amount of non-critical information. To ensure data integrity, this function is enabled by default and cannot be disabled after the file system has been created.

      [Example]

      Enable

      [Default]

      Enable

      Capacity Autonegotiation Policy

      A storage system supports the following capacity autonegotiation policies:

      • Not Use Capacity Autonegotiation: The storage capacity used by a file system is fixed and is not flexibly adjusted by the storage system.
      • Auto Expand Capacity: increases file system capacity and meets users' requirements in data write when the available space of a file system is about to run out and the storage pool has available space.
      • Auto Reduce or Expand Capacity: The storage system automatically adjusts the file system capacity based on file system space usage. When the available space of a file system is about to run out and the storage pool has available space, automatic capacity expansion will be used to increase file system capacity. When the file system's storage space is released, it can be reclaimed into a storage pool and used by other file systems in data write requests.
      NOTE:

      Parameters related to Capacity Autonegotiation are only supported in V300R006C10 and later versions.

      [Example]

      Auto Expand Capacity

      [Default]

      Not Use Autonegotiation

      Capacity Reclamation Mode

      A storage system supports the following capacity reclamation modes:

      • Preferentially Expand Capacity: Expands the capacity to increase the file system capacity.
      • Preferentially Delete Old Snapshot: Deletes old snapshots to reclaim space for increasing the file system capacity. If HyperReplication and HyperMetro are configured for storage systems, the capacity autonegotiation policy of the primary storage system will be synchronized to the secondary storage system. If Preferentially Delete Old Snapshot is adopted, ensure that Delete Obsolete Read-Only Snapshots is enabled for the secondary storage system.

      [Example]

      Preferentially Expand Capacity

      [Default]

      Preferentially Expand Capacity

      Auto Adjust Capacity

      After you select Auto Adjust Capacity, the automatic capacity expansion or reduction policy for a file system will take effect during the service running.

      [Example]

      Enable

      [Default]

      Enable

      Auto Expand Trigger Threshold (%)

      When the percentage of the used capacity to the total capacity of the file system is greater than the preset value, the storage system automatically triggers file system capacity expansion.

      [Value range]

      The value is an integer ranging from 2 to 99.

      [Example]

      85

      [Default]

      85

      Auto Reduce Trigger Threshold (%)

      When the percentage of the used capacity to the total capacity of the file system is smaller than the preset value, the storage system automatically triggers file system space reclamation and reduces file system capacity.

      [Value range]

      The value is an integer ranging from 1 to 99.

      [Example]

      50

      [Default]

      50

      Auto Expand Upper Limit

      Sets the auto expand upper limit.

      [Value range]

      File system capacity to 16 PB

      [Example]

      120 GB

      [Default]

      File system capacity * 120%

      Auto Reduce Lower Limit

      Sets the auto reduce lower limit.

      [Value range]

      1 GB to Auto Expand Upper Limit

      [Example]

      100 GB

      [Default]

      File system capacity

      Auto Expanded/Reduced Capacity Each Time

      Sets the auto expanded or reduced capacity for each time.

      [Value range]

      64 MB to 100 GB

      [Example]

      1 GB

      [Default]

      1 GB

    3. Click OK.

      The Execution Result dialog box is displayed, indicating that the operation succeeded.

  5. Click Close.
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Updated: 2019-07-12

Document ID: EDOC1000138856

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