Viewing the capacity information for a pool

Use this procedure to view the capacity information for a specific pool.

Before you begin

The Storage Administrator (Provisioning) role is required to perform this task.

Procedure

  1. Click Storage Systems, and then expand the Storage Systems tree.

  2. Click Pools.

    The Pools tab displays the following capacity information for each pool.

    Item

    Description

    Capacity

    Displays information about the pool capacity.

    • Total: Total capacity of the pool. For a pool that contains pool-volumes assigned to accelerated compression-enabled parity groups, the writeable capacity might be smaller than the displayed capacity.

      Click Option to select the desired capacity unit.

      • One block = 512 bytes
      • One page = 42 MB
    • Reserved: Displays the reserved page capacity of the pool.

      The displayed value of Reserved might be larger than the displayed value of Total due to the following reasons:

      • Reserved displays reserved page capacity that is rounded up on each page.
      • The mapped capacity of DP-VOL includes the capacity of the control information (requires a maximum of 168 MB per 3,145,548 MB).

    • Used: Sum of the mapped capacity and reserved capacity.

      The displayed value of Used might be larger than the displayed value of Total due to following reasons:

      • Used displays the sum of the mapped capacity and reserved capacity, which are rounded up on each page.
      • The mapped capacity of a DP-VOL includes the capacity of the control information (uses a maximum of 168 MB per 3,145,548 MB).
      • A DP-VOL with data direct mapping attribute includes the control information (168 MB is used per 3,145,548 MB) and capacity for one page.

    • Used (%): On a pool capacity basis, percentages of the sum of the mapped capacity and the reserved page capacity (rounded down to the nearest integer).

    For Dynamic Provisioning, Dynamic Tiering, and Thin Image pools, a hyphen (-) is displayed if the capacity unit is changed to Cylinder.

    Saving Effect1

    The capacity saving rates and capacity that is reduced by accelerated compression and the capacity saving function (compression and deduplication). A hyphen appears if the pool does not support accelerated compression or the capacity saving function.

    • Saving (%)1: Displays the ratio of the Saving capacity with respect to the user data capacity. The total value of Deduplication (%) and Compression (%).
    • Saving1: Displays the saved capacity for a pool. The total value of the capacity expansion function and the capacity saving function.
    • Deduplication (%)1: Displays the data capacity ratio reduced by the deduplication function in the user data capacity.
    • Compression (%)1: Displays the data capacity ratio reduced by accelerated compression and the compression function in the user data capacity.

    Physical Capacity1

    For a pool containing pool volumes that support accelerated compression, this item displays the capacity assured for writing. If accelerated compression is not supported, a hyphen (-) is displayed.

    • Total: Displays the total pool capacity assured for writing.
    • Used: Displays the used capacity of the pool. The used capacity is the capacity deducted from the free capacity assured for writing from the total pool capacity assured for writing. For a pool comprised of pool volumes assigned to accelerated compression-enabled parity groups, the compressed data capacity is included in the used capacity.
    • Used (%): Displays the percentage of the used pool capacity against the total capacity assured for writing

    Capacity Expansion Rate (%)1

    For a pool containing pool volumes that support accelerated compression, this item displays the percentage of the total capacity with respect to the capacity assured for writing. If accelerated compression is not supported, a hyphen (-) is displayed.

    Physical FMC Pool Volumes Capacity 1

    For FMC pool volumes used in the pool, this item displays the capacity guaranteed for writing. If the pool does not include FMC pool volumes, a hyphen (-) is displayed.

    • Total: Displays the total capacity of FMC pool volumes for which writing is assured.
    • Used: Displays the used capacity of FMC pool volumes after they are compressed.

    FMC Pool Volumes Capacity

    Displays the capacity of FMC pool volumes used in the pool. If the pool does not include FMC pool volumes, a hyphen (-) is displayed.

    • Total1: Displays the total capacity of FMC pool volumes.
    • Used1: Displays the used capacity of FMC pool volumes.
    • Saving1: Displays the capacity reduced by the FMC data compression function.
    • Saving (%)1: Displays the ratio of the Saving (capacity) with respect to the Used (capacity) for Pool Volumes Capacity.
    • Expansion Rate (%): Displays the percentage of the total capacity of FMC pool volumes with respect to the total capacity of FMC pool volumes assured for writing. If either the used pool capacity or the used physical pool capacity exceeds 50% of the depletion threshold (the warning threshold for the Thin Image pool), an icon of one of following statuses appears:

      : In all accelerated compression-enabled parity groups, this status shows that the expansion rate and the saving ratio are balanced.

      : In one or more accelerated compression-enabled parity groups, this status show that an excess of the unanticipated usage might occur. In this case, consider revising the total capacity of LDEVs (pool volumes) carved from these parity groups. For details, see Guidelines for pools when accelerated compression is enabled.

      :

      In one or more accelerated compression-enabled parity groups, this status shows that the accelerated compression function is not performed in the effective utilization. However, if there is a parity group with a status (see above) in the pool, then this icon does not appear. In this case, consider revising the total capacity of LDEVs (pool volumes) carved from these parity groups. For details, see Guidelines for pools when accelerated compression is enabled.

    Pool Saving (Post Process Data)

    The data capacity reduction provided by the capacity saving function, which includes compression and deduplication. A hyphen (-) is displayed if the capacity saving function is not supported.

    • Saving (%): Displays the capacity reduction (%) provided by the capacity saving function, which is calculated as the ratio of Saving to Pre Saving Used.
    • Saving: Displays the capacity reduction (bytes) provided by the capacity saving function.
    • Used (Pre Processed Data): Displays the data capacity before the reduction provided by the capacity saving function.

    Snapshot Used Capacity

    The used capacity for snapshot data in a Dynamic Provisioning pool that contains Thin Image pairs and snapshot data.

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