Creating a Cached Volume or Cached LD Volume

When you create a Cached Volume, you choose two pools with different tier levels. The upper-level (fast) pool is used for caching. When you create a Cached LD Volume, you choose an existing logical drive as the primary storage device, then you select the cache pool. Optionally, you can specify the size of the cache pool. You can also "tune" the volume by specifying its fetch and flush rate.

To create a Cached Volume or Cached LD Volume:

  1. In the Enterprise View, open the maxCache Plus tree, then select the Virtual Volumes tree node.
  2. On the ribbon, in the Virtual Volume group, click Create Virtual Volume.

  3. When the wizard opens, click Cached or Cached LD, then click Next.

  4. (Cached LD Volume only) For a Cached LD Volume, select the logical drive you want to use as the primary storage device, then click Next. You can select only one logical drive.

  5. In the Caching Attributes panel, select the lower-level pool from the Volume Device drop-down list, then select the cache (upper-level) pool.
    Note: For a Cached LD Volume, the Volume Device/Size field is read-only. The volume device is fixed, based on your selection in Step 4.


  6. Customize the volume settings. You can:
    • Enter a name for the volume (up to 31 characters). Names can include any combination of letters and numbers, but cannot include spaces. The default is VDn (VD0, VD1, and so on).
    • (Cached Volume only) Adjust the volume size. By default, the volume size equals the size of the lower-level pool.
      Note: For a Cached LD Volume, the volume size is fixed, based on your selection in Step 4.
    • Adjust the size of the cache pool by clicking on either the size or percent spinners. By default, the capacity of the cache pool is set to 20% of the capacity of the lower-level pool.
    • Select the cache mode:
      • Write-Back (Cached Volume only): uses the cache for fast retrieval and updates lower-level storage at the same time.
      • Write-Through: uses cache for the "freshest" data and updates lower-level storage at a later time.
    • Adjust the volume's fetch and flush rate. Valid values are: Aggressive, Normal, Passive
  7. Click Next, review the volume settings, then click Finish.

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