On 01/22/2015 10:07 AM, Josh Fisher wrote:
> There is likely no reason to have SpoolData=yes for disk volumes, and it
> could actually slow things down.
On 01/22/2015 07:32 AM, Clark, Patricia A. wrote:
> Spooling is for the benefit of tape drives and databases. What is the
> benefit of spooling data for virtual tapes that are really disks?
1. Job interleaving.
2. "If you are running multiple simultaneous jobs, Bacula will continue
spooling other jobs while one is despooling to tape, provided there is
sufficient spool file space." (TFM - "Data Spooling" - "Other points".)
10 clients, (up to) 10 concurrent jobs, vchanger with one "device" and
plenty of pre-labeled 50GB file volumes, 50GB max spool size/job.
> Is one of the jobs running concurrently with the failing job backing up
> the machine SD is running on?
Yesno: it's not backing up any of the usual suspects (the spool disk,
/var/log, var/lib/pgdata, ...)
> Certainly, the spool directory should not be on the same disk drives
> that the database is on.
Right. Spool is on a separate tler drive.
It does look like the spool disk might have been the bottleneck indeed,
and the same client failing over and over again was just a coincidence
-- perhaps it has more data than the others of its kind. I won't know
until more jobs get to run, but so far the manually started full backup
looks promising: 100+ MB/s write speed on the spool. I might switch it
to xfs with barriers off and/or get an SSD for it.
--
Dimitri Maziuk
Programmer/sysadmin
BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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