[gpfsug-discuss] ILM: migrating between internal pools while premigrated to external
Marc A Kaplan
makaplan at us.ibm.com
Tue Apr 24 17:00:39 BST 2018
I added support to mmapplypolicy & co for HPSS (and TSM/HSM) years ago.
AFAIK, it works pretty well, and pretty much works in a not-too-surprising
way.
I believe that besides the Spectrum Scale Admin and Command docs there are
some "red book"s to help,
and some IBM support people know how to use these features.
When using mmapplypolicy:
a) Migration and pre-migration to an external pool requires at least two
rules:
An EXTERNAL POOL rule to define the external pool, say 'xpool' and a
MIGRATE ... TO POOL 'xpool' rule.
b) Migration between GPFS native pools requires at least one MIGRATE ...
FROM POOL 'apool' TO POOL 'bpool' rule.
c) During any one execution of mmapplypolicy any one particular file will
be subject of at most one MIGRATE rule. In other words
file x will be either (pre)MIGRATEd to an external pool. OR MIGRATED
between gpfs pools. BUT not both.
(Hmm... well you could write a custom migration script and name that
script in your EXTERNAL POOL rule and do anything you like
to each file x that is chosen for "external" MIGRATion... But still just
one MIGRATE rule governs file x.)
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