GPFS file system size requirements for Storage Archive metadata

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The size requirement of the GPFS file system that is used to store the IBM Storage Archive Enterprise Edition metadata directory depends on the block size and the number of files that are migrated to the IBM Storage Archive EE.

The following calculation produces an estimate of the minimum number of inodes that the GPFS file system must have available:

       500 + (15 x c)

where c is the number of cartridges.

For example, if there are 200 cartridges, c = 200, and the minimum number of inodes that the GPFS file system must have available is 3500.

         500 + (15 x 200) = 3500

Note: If you have more than one tape library, the number of cartridges in your calculation must be the total number of cartridges in all libraries.

The total required capacity for metadata is calculated by using the following formula:

10 + (3 x F x N) GB

Where F is the number of files, in millions, to migrate, and N is the number of replicas to create. For example, if you have 50 million files to migrate into two tape pools, then 310 GB of metadata is required.

10 + (3 x 50 x 2) = 310 GB