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List:       bacula-users
Subject:    [Bacula-users] Again LTO9 and performances...
From:       Marco Gaiarin <gaio () lilliput ! linux ! it>
Date:       2024-05-17 10:29:50
Message-ID: s5ojhk-5t41.ln1 () leia ! lilliput ! linux ! it
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I'm still fiddling with LTO9 and backup performances; finally i've managed
to test a shiny new server with an LTO9 tape (library indeed, but...) and i
can reach with 'btape test' 300MB/s, that is pretty cool, even if IBM
specification say that the tape could perform 400 MB/s.

Also, following suggestion, i'm using spooling to prevent tape to spin
up&down; but this clearly 'doubles' the backup time... there's some way to
do spooling in parallel? EG, while creating the next spool file, bacula
write to tape the current one?


Anyway, i'm hit another trouble. Seems that creating the spool file took an
insane amount of time: source to backup are complex dirs, with millions of
files. Filesystem is ZFS.

'insane amount' means that having a despool performance of 300MB/s, i'm a
overral backup performance of 40MB/s...


How can i do to improve the spooling performance? What factors impact more?


Thanks.

-- =

dott. Marco Gaiarin				        GNUPG Key ID: 240A3D66
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it/
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 (PN)
  marco.gaiarin(at)lanostrafamiglia.it   t +39-0434-842711   f +39-0434-842=
797

		Dona il 5 PER MILLE a LA NOSTRA FAMIGLIA!
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