From: Dave Chinner <david@fromorbit.com>
To: flux@hotbox.ru
Cc: xfs@oss.sgi.com
Subject: Re: XFS syncs
Date: Fri, 4 Jul 2014 09:17:30 +1000 [thread overview]
Message-ID: <20140703231730.GW4453@dastard> (raw)
In-Reply-To: <53B59B81.2030603@hotbox.ru>
On Thu, Jul 03, 2014 at 10:05:53PM +0400, flux@hotbox.ru wrote:
> Hi,
>
> I issue 'mkdir abc' on my xfs partition the cut off the power. After
> reboot there's no 'abc' directoy.
Because you didn't sync(1) the filesystem or fsync(2) the directory
before you cut the power. Hence the change never hit the disk.
> However, when I do that on ext4
> the 'abc' direcory is always created after reboots.
That'll be pure fluke - ext4 delays journal writes on namespace
operations just like XFS does.
> All the
> settings, about mount options are default for my distro. What am I
> missing or how do I change the things of the jounral or whatever?
If you want directory operations to hitthe disk immediately, then
mount with the "-o wsync" option. Be aware, however, that this will
kill performance unless you have expensive storage with a large
amount of battery backed write cache in front of the disks. There's
a good chance it will also cause excessive wear on SSDs due to the
frequent journal writes.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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next prev parent reply other threads:[~2014-07-03 23:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-03 18:05 XFS syncs flux
2014-07-03 21:33 ` Stan Hoeppner
2014-07-03 23:17 ` Dave Chinner [this message]
2014-07-04 14:09 ` flux
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