Mohammed Sadiq wrote:
Hi
Is it recommended to do scrub while the filesystem is mounted . How
frequently do we have to do scrub and at what circumstances.
You can scrub while the filesystems are mounted - most people do,
there's no reason to unmount for for a scrub. (Scrub is pool level, not
filesystem level.)
Scrub does noticeably slow the filesystem, so pick a time of low
application load or a time when performance isn't critical. If it
overruns into a busy period, you can cancel the scrub. Unfortunately,
you can't pause and resume - there's an RFE for this, so if you cancel
one you can't restart it from where it got to - it has to restart from
the beginning.
You should scrub occasionally anyway. That's your check that data you
haven't accessed in your application isn't rotting on the disks.
You should also do a scrub before you do a planned reduction of the pool
redundancy (e.g. if you're going to detach a mirror side in order to
attach a larger disk), most particularly if you are reducing the
redundancy to nothing.
--
Andrew Gabriel
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