Defining a Sequential Access Storage Pool

To define a sequential access primary storage pool, first complete the following fields and then click Finish, or click Cancel to end the task.

Storage Pool Name

Enter the name of the storage pool to be defined. The maximum length of the name is 30 characters.

Device Class

Select the name of the device class.

Description

Enter the description of the storage pool to be defined.

Media Access Status

Select how users and system processes (like migration and reclamation) can access files in the storage pool.

Readwrite Specifies that users and system processes can read and write to files stored on volumes in the storage pool. The default is Readwrite.
Readonly Specifies that users can only read files from the volumes in the storage pool.
Unavail able Specifies that users cannot access files stored on volumes in the storage pool.

Maximum Size Threshold

Enter the maximum physical size of a file to be stored in the storage pool. Specify a number from 1 to 999999 followed by a scale factor, or Nolimit. The default is Nolimit.

Scale factors and their meanings are:

K Kilobyte
M Megabyte
G Gigabyte
T Terabyte

Next Storage Pool

Select the name of the storage pool to which files can be migrated.

High Migration Threshold

Enter the percentage of storage pool occupancy that specifies when ADSM can start migration for this storage pool.

Low Migration Threshold

Enter the percentage of storage pool occupancy to determine when ADSM can stop migration for this storage pool.

Collocate

Select whether ADSM attempts to keep data belonging to a single client node or to a single client node's filespace on as few volumes as possible.

Yes Specifies that collocation is enabled. The server tries to put data for one node on as few volumes as possible. If the node has multiple filespaces, no attempt is made to collocate those filespaces.
No Specifies that collocation is disabled. The default is No.
Filespace Specifies that collocation is enabled at the filespace level for client nodes. The server tries to put data for one node and filespace on as few volumes as possible. If a node has multiple filespaces, the server attempts to put data for different filespaces on different volumes.

Reclamation Threshold

Enter the percentage of reclaimable space on a volume that specifies when to initiate reclamation of fragmented space on volumes in the storage pool.

Maximum Scratch Volumes Allowed

Enter the maximum number of scratch volumes that can be requested by ADSM.

Delay Period for Volume Reuse

Enter the number of days (0 to 9999) that must elapse after all files have been deleted from a volume, before the volume can be rewritten or returned to the scratch pool. The default is 0.

Reclaim to Storage Pool

Select another storage pool as a target for reclaimed data.

Overflow Location

Enter the overflow location for the storage pool being defined. This applies to storage pools associated with automated libraries only. The maximum length is 255 characters. This option is not for AS400.

Migration Delay

Enter the number of days a file must remain in a storage pool before the file is eligible for migration from the storage pool. The number of days is counted from the day the file was last stored in the storage pool or retrieved by a client, or whichever is more recent.

Migration Continue

Select an option to determine whether ADSM is allowed to migrate files that do not satisfy the migration delay time. This parameter is optional. The default is yes.

Because you can require that files remain in the storage pool for a minimum number of days, ADSM may migrate all eligible files to the next storage pool yet not meet the low migration threshold. Selecting yes or no determines if ADSM is allowed to continue migrating files that do not satisfy the migration delay time.

Yes Specifies that when necessary to meet the low migration threshold, ADSM continues to migrate files that do not satisfy the migration delay time.
No Specifies that ADSM stops migration when no eligible files remain to be migrated, even before reaching the low migration threshold. ADSM does not migrate files unless the files satisfy the migration delay time.