Setting up a storage pool hierarchy

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As part of the implementation process, you must set up a storage pool hierarchy. Set up at least one primary storage pool on disk and one primary storage pool on tape. Ensure that data is migrated from disk to tape daily.

Before you begin

  1. Ensure that you reviewed the information in Planning the storage pool hierarchy.
  2. Ensure that appropriate rules, also known as policies, are specified for backing up client data. Follow the instructions in Specifying rules for backing up and archiving client data.
  3. Ensure that a policy is assigned to each node. For instructions about assigning a policy when you register a node, see Registering clients.

Procedure

To set up a storage pool hierarchy, complete the following steps:

  1. Define a primary storage pool for the tape device by issuing the DEFINE STGPOOL command.

    For example, define a primary storage pool, TAPE1, with a device class of LTO, and enable group collocation. Set the maximum number of scratch volumes that the server can request for this storage pool to 999. Issue the following command:
    define stgpool tape1 lto pooltype=primary collocate=group
maxscratch=999
  2. Define the drives, paths, and libraries for the primary storage pool on tape. Follow the instructions in Defining tape devices.
  3. Define a primary storage pool for the disk device by issuing the DEFINE STGPOOL command.

    For example, define a storage pool, DISK1, with a device class of FILE. Ensure that data can be migrated to the tape storage pool, TAPE1, but prevent automatic migration by specifying 100 for the HIGHMIG parameter and 0 for the LOWMIG parameter. Prevent reclamation by specifying 100 for the RECLAIM parameter. Enable node collocation. Set the maximum number of scratch volumes that the server can request for this storage pool to 9999. Use the MIGPROCESS parameter to specify the number of migration processes. The value of the MIGPROCESS parameter should equal the number of drives in the library minus the number of drives that are reserved for restore operations. Issue the following command:
    define stgpool disk1 file pooltype=primary nextstgpool=tape1
highmig=100 lowmig=0 reclaim=100 collocate=node maxscratch=9999 migprocess=5
    For more information about how to set up migration from disk to tape, see Planning the storage pool hierarchy.

What to do next

A storage pool hierarchy includes only primary storage pools. After you set up the storage pool hierarchy, complete the following steps:
  1. Create a copy storage pool on a tape device. For instructions, see DEFINE STGPOOL (Define a copy storage pool assigned to sequential access devices).
  2. Back up the tape-based primary storage pool to the copy storage pool by using the BACKUP STGPOOL command. For instructions, see BACKUP STGPOOL (Back up primary storage pool data to a copy storage pool).
  3. To ensure that data can be recoved in a disaster, set up a procedure for moving tape volumes from the copy storage pool to an offsite location. For instructions, see Preparing for and recovering from a disaster by using DRM.