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Re: XFS syncs

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS syncs
From: flux@xxxxxxxxx
Date: Fri, 04 Jul 2014 18:09:05 +0400
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
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Hello Dave,

Thanks for the explanation and your suggestion to use wsync option.

On 07/04/2014 03:17 AM, Dave Chinner wrote:
On Thu, Jul 03, 2014 at 10:05:53PM +0400, flux@xxxxxxxxx wrote:

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.



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