On 11/04/13 13:00, Josh Fisher wrote:
> I would add that it is critical (IMO) to place the DB storage on
> different physical drives than those holding the Bacula spool area. At
> the end of a job Bacula SD must read the spooled attributes and update
> the catalog. If spooled attributes and catalog are on the same spindles,
> then the disk thrashing negates the advantage of attribute spooling. I
> might also add that placing the catalog on SSD resulted in a hefty
> performance gain.
Seconded. Wherever possible, you always want your DB either on separate
spindles or on solid-state media where seek latency is not an issue.
> As for clustering using DRBD, the catalog and spool area should still be
> on different spindles.
Honestly, based upon experience as a DBA at a hosting company that hosts
MANY customers using MySQL, my first advice on using MySQL on top of
DRBD would be "Just don't." I could cite lists of customers who have
had complete unrecoverable DB losses as a result of problems or
interactions involving DRBD, and had to rebuild from DB backups. If
you're going to cluster MySQL, use a shared-nothing configuration if you
possibly can.
--
Phil Stracchino, CDK#2 DoD#299792458 ICBM: 43.5607, -71.355
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Renaissance Man, Unix ronin, Perl hacker, SQL wrangler, Free Stater
It's not the years, it's the mileage.
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