Hello,
A few months back we took a look at Robinhood Policy Engine on a Lustre 2.5.x
testbed with eyes toward accomplishing two main goals: a) automatic migration
between OST pools based upon atime without changing the path, and b)
replication of particular data to an external file system. It seemed like
current Robinhood software releases could do this by running a tmpfs manager
with a custom purge command (lfs migrate) to handle the migration between
pools, and an lhsm manager for the replication.
With upgrade and expansion our production file system from 1.8.9 to 2.5 being
planned for the new year (new system), we are considering how to best bring the
above two goals into production. We want have the Robinhood components we need
in place when the new system goes into production, and we want to avoid ever
having to rescan the file system. So I have the following questions I hope I
can get some input on:
1) At the time I was looking, the lhsm manager could not have a custom
purge command (appended). If it could, then we would only need to run the lhsm
manager, which would be ideal - it could handle both of our use cases and we
could have a single changelog reader and a single database. Is this possible
with current software releases?
2) If we need to run both lhsm and tmpfs managers, can they be run
simultaneously from the same client?
3) We intend to use a database running on a different node than the
Robinhood managers. I am not sure how to wisely choose HW for mysqld to keep
up with the changelogs. We can use stats from our current 1.8.9-based file
system and cluster activity to size this, but I'm not sure what to look at.
Any pointers here?
Thanks,
Craig Prescott
UF Research Computing
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