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From: flux@hotbox.ru
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: XFS syncs
Date: Fri, 04 Jul 2014 18:09:05 +0400	[thread overview]
Message-ID: <53B6B581.5070801@hotbox.ru> (raw)
In-Reply-To: <20140703231730.GW4453@dastard>

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@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.
>

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      reply	other threads:[~2014-07-04 14:09 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
2014-07-04 14:09   ` flux [this message]

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