Overview of a pool

REST API Reference Guide for Virtual Storage Platform 5000, Virtual Storage Platform E Series, and Virtual Storage Platform G/F Series

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A pool is a virtual area created by integrating multiple LDEVs. You can create virtual volumes from a pool, and then allocate or pair the volumes.

You can create a virtual volume that has a capacity larger than that of the physical drive, and expand or reduce the size of a virtual volume as necessary. By doing so, you can effectively use the resources of a storage system and reduce the workload of adding and configuring drives. In addition, data is decentralized and stored on multiple drives by integrating multiple physical volumes, thereby improving drive operation efficiency.

HDP pools, HDT pools, and Thin Image pools are created by the REST API. In this manual, HDP pools and HDT pools are referred to as DP pools when differentiation is unnecessary.

The following is a list of operations that can be performed for pools by using the REST API.

  • Create pools

    Create DP pools or Thin Image pools by specifying LDEVs. You can also set a threshold value for the pool usage rate to be used for issuing a warning when that value is exceeded. Use DP pools to create virtual volumes, and use Thin Image pools to store snapshot data. You can also store snapshot data in HDP pools.

  • Change pool settings

    Change the pool type from the HDP pool to the HDT pool, change the threshold usage rate of the DP pool or the Thin Image pool, or change the subscription of a virtual volume to DP pool capacity.

  • Expand pools

    Expand capacity by adding LDEVs to DP pools or Thin Image pools.

  • Shrink pools

    Reduce capacity by deleting the LDEVs that compose the DP pools or Thin Image pools.

  • Perform performance monitoring of HDT pools

    Start or stop monitoring of HDT pools at a specific timing so that HDT pool data is appropriately located.

  • Perform tier relocation for HDT pools

    Based on the performance monitoring information, relocate HDT pool data to an appropriate tier.

  • Restore pools

    Unblock DP pools or Thin Image pools that have recovered from a failure or other problem.

  • Delete pools

    Delete DP pools or Thin Image pools that are no longer necessary.

  • Get information about pools

    Get information about DP pools or Thin Image pools.

You create pools during the procedure to allocate volumes or create Thin Image pairs. Perform other operations on pools according to the status of the pools.

For details on HDP (Dynamic Provisioning) and HDT (Dynamic Tiering), see the Provisioning Guide for Open Systems, or the Provisioning Guide.