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Administrator Guide 15

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

Routine maintenance activities are the most common activities for the storage device, including powering on or off the storage device, managing users, modifying basic parameters of the storage device, and managing hardware components. This document applies to the system administrators who are responsible for carrying out routine maintenance activities, monitoring the storage device, and rectifying common device faults.
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Modifying Capacity of a Storage Pool

Modifying Capacity of a Storage Pool

When the storage pool capacity is insufficient, you can expand it to meet actual needs. When the storage pool is with surplus capacity, you can reduce it to release storage space.

Prerequisites

  • The Health Status of the storage pool is Normal.
  • The disk domain has available storage space for capacity expansion of the storage pool
  • The reduced capacity must be smaller than maximum capacity for reduction.

Procedure

  1. Log in to DeviceManager.
  2. Choose Provisioning > Storage Pool.
  3. Select the storage pool you want to expand and click Modify Capacity.

    The Modify Capacity dialog box is displayed.

  4. In Operation, select the mode of modifying capacity. The modes are Expand capacity and Reduce capacity.

    • Expand the capacity of a storage pool.
      1. Select the storage tier you want to expand or create.
      2. To create a storage tier, configure the RAID policy and in Capacity, enter the capacity of the storage tier.

        Table 5-1  Storage tier parameters

        Parameter

        Description

        Setting

        RAID Policy

        RAID level. The system supports RAID 0, RAID 1, RAID 10, RAID 3, RAID 5, RAID 50, and RAID 6.

        NOTE:

        RAID 0 only supports configuration in CLI mode. For details, see the OceanStor 5300 V3&5500 V3&5600 V3&5800 V3&6800 V3 Storage System V300R003 Command Reference .

        Select a RAID policy based on the planned solution.

        • Default RAID policy of the high performance tier: RAID 10
        • Default RAID policy of the performance tier: RAID 5 (4D+1P)
        • Default RAID policy of the capacity tier: RAID 6 (4D+2P)
        NOTE:
        If the number of SSDs in a disk domain is two or three, you are advised to configure the corresponding high-performance tier to RAID 1 (2D).

        Capacity

        The capacity that the storage tier provides for the storage pool.

        Two capacity levels are provided: TB, GB.

        The capacity must be not larger than the available capacity of the storage tier.

      3. To expand a storage tier, in Added Capacity, enter the added capacity of the storage tier.

    • Reduce the capacity of a storage pool.
      1. Select the storage tier you want to reduce.
      2. In Reduction Capacity, enter the capacity of the storage tier to be reduced.

    NOTE:
    • You can create a storage tier or expand the existing storage tier to expand storage pools.
    • You can configure RAID policy only for new created storage tier. For the storage tier exists in the storage pool, you cannot modify its RAID policy.
    • The number of RAID data disks of different storage pool tiers must be a multiple of 1, 2, 4, or 8.

  5. Optional: If there are multiple storage tiers, you are advised to set a SmartTier policy. The policy enables data to migrate among different types of disks, optimizing storage performance distribution. Table 5-2 lists SmartTier policies of a storage pool.

    Table 5-2  SmartTier policy of the storage pool

    Parameter

    Description

    Setting

    Service Monitoring Period

    Period of time during which the service is monitored and hotspot statistics is collected after you select Enable I/O monitoring. The statistics serves as guidance for data to migrate among different storage tiers.

    You can specify the period by setting days, Start Time, and Duration.

    [Default value]

    I/O monitoring disabled

    Data Migration Plan

    The trigger policy of data relocation between the storage layers in a storage pool. The policies include:
    • Manual: You must manually trigger the data relocation among storage tiers. The data relocation process is transparent to application servers. Manual data relocation can be performed anytime.
    • Periodical: You must specify the start time and duration of data relocation for the storage system to perform data relocation automatically at the specified time. This reduces the management cost and complexity. The data relocation process is transparent to application servers. Automatic data relocation is performed only at the specified time.

    [Default value]

    Manual

    NOTE:
    • If Data Migration Plan is set to Periodical, I/Os are monitored on a 7x24 basis by default.
    • SmartTier policy is only applicable when Usage of a storage pool is configured as Block Storage Service.

    • If the remaining capacity in a storage pool is equal to or smaller than 10% of the total capacity, data does not migrate in the storage pool.

  6. Confirm the capacity modification of the storage pool.
    1. Click OK.

      NOTE:

      If a security alert dialog box is displayed, confirm the information in the dialog box and select I have read and understand the consequences associated with performing this operation. Click OK.

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

    2. Click Close.
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Updated: 2019-08-14

Document ID: EDOC1000084191

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