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Administrator Guide

OceanStor 2800 V5 V500R007

This document is applicable to OceanStor 2800 V5. 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 is intended for 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.


  • 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.


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

    The Modify Capacity dialog box is displayed.

  3. 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. You can create a new storage tier or expand the existing storage tier to expand storage pools.
        • To create a storage tier, configure the RAID policy and in Capacity, enter the capacity of the storage tier.
          Table 5-47 Storage tier parameters




          RAID Policy

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


          RAID 0 can only be configured using the CLI. For details, see the command reference specific to your product model and version.


          Use NL-SAS or SATA disks to create RAID 6 (26D+2P)


          Capacity that the storage tier provides for the storage pool.

          Two capacity levels are provided: TB and GB.

          The capacity must be no larger than the available capacity of the storage tier.

        • To expand a storage tier, in Added Capacity, enter the added capacity of the storage tier.
        • You can configure RAID policy only for new created storage tier. For the storage tier already 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.
    • 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.

  4. Optional: If there are multiple storage tiers, click Advanced to set the stripe depth.

    Click Advanced. The Advanced Settings dialog box is displayed.

    Table 5-48 Advanced settings parameters




    Strip Depth

    Strip refers to continuous data that is divided into data blocks of the same size and data blocks are distributed on different disks of storage devices. In this way, I/O loads are balanced among disks, improving read/write performance.

    Strip depth refers to strip size, indicating the size of data blocks on each disk. Smaller strip size indicates smaller data blocks. These data blocks are distributed on more disks, improving transmission performance. However, more time is required to find different data blocks, decreasing disk locating performance. On the contrary, fewer data blocks indicate lower transmission performance but higher disk locating performance.

    The value of this parameter can be:

    • System auto select

      The system selects the optimal strip depth based on the RAID policy of the storage tier and data migration granularity.

    • 32 KB
    • 64 KB
    • 128 KB

      128 KB is recommended for random read/write services (such as in database scenarios).

    • 256 KB
    • 512 KB

      512 KB is recommended for sequential read/write services (such as media asset scenarios)


    The parameter value cannot be changed after being determined.

    [Default value]

    System auto select

  5. Confirm the capacity modification of the storage pool.

    1. Click OK.

      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.

Updated: 2019-07-11

Document ID: EDOC1000181576

Views: 18684

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