Re: Linux Filesystems again - Ubuntu this time - Mailing list pgsql-performance

From Kevin Grittner
Subject Re: Linux Filesystems again - Ubuntu this time
Date
Msg-id 4C4ECCD10200002500033D76@gw.wicourts.gov
Whole thread Raw
In response to Re: Linux Filesystems again - Ubuntu this time  (Whit Armstrong <armstrong.whit@gmail.com>)
Responses Re: Linux Filesystems again - Ubuntu this time  ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>)
List pgsql-performance
Whit Armstrong <armstrong.whit@gmail.com> wrote:

> While we're on the topic, do you also diable fsync?

We only disable fsync during bulk loads, where we would be starting
over anyway if there was a failure.  Basically, you should never use
fsync unless you are OK with losing everything in the database
server if you have an OS or hardware failure.  We have a few
databases where we would consider that if performance wasn't
otherwise acceptable, since they are consolidated replicas of
off-side source databases, and we have four identical ones in two
separate buildings; however, since performance is good with fsync on
and it would be a bother to have to copy from one of the other
servers in the event of an OS crash, we leave it on.

-Kevin

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