[gpfsug-discuss] Recharging where HSM is used

[valdis.kletnieks at vt.edu]

On Thu, 03 May 2018 16:52:44 +0100, Jonathan Buzzard said:

> The test that I have used in the past for if a file is migrated with a
> high degree of accuracy is 
>
>     if the space allocated on the file system is less than the
>     file size, and equal to the stub size then presume the file
>     is migrated.

At least for LTFS/EE, we use something like this:

define(is_premigrated,(MISC_ATTRIBUTES LIKE '%M%' AND MISC_ATTRIBUTES NOT LIKE '%V%'))
define(is_migrated,(MISC_ATTRIBUTES LIKE '%V%'))
define(is_resident,(NOT MISC_ATTRIBUTES LIKE '%M%'))

RULE 'MIGRATED' LIST 'ltfsee_files'
FROM POOL 'system'
SHOW('migrated ' || xattr('dmapi.IBMTPS') || ' ' || all_attrs)
WHERE is_migrated AND (xattr('dmapi.IBMTPS') LIKE '%:%' )

Not sure if the V and M misc_attributes are the same for other tape backends...
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