View the percentage of migrated data in external pools that does not fit into the
available capacity on an IBM Storage Scale file
system.
About this task
This percentage, called shortfall, represents the relative risk of not having enough
internal file system space if you recall all data from the associated external pools. The higher the
percentage, the higher the amount of migrated data that does not fit.
Procedure
To view the potential shortfall for a file system, complete the following
steps:
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From the menu, click .
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Right-click a IBM Storage Scale storage
system and click View Details.
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Under Internal Resources, click File
Systems.
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Locate the file system that you want to check and view the value in the Shortfall column.
To calculate shortfall, the following formula is used:
[(External Pool Migrated Data − Available Capacity) ÷ External Pool Migrated Data] × 100
For example, if the available capacity on a file system is 200 GiB, but the used capacity of
migrated data on external pools is 500 GiB, the shortfall percentage is 60% (300 GiB). In this case,
consider adding capacity to the file system before recalling data.
[(500 − 200)÷ 500] × 100 = 60%
If the file system has sufficient available capacity to contain all the migrated data in external
pools, no shortfall exists. For example, if the available capacity on a file system is 500 GiB, and
the used capacity in external pools is only 200 GiB, the shortfall is 0%.
Tip: Only the space that is used by migrated data in external pools is included in the
calculation for shortfall. Pre-migrated data is not included because it exists in both the internal
and external pools.