RE: regarding journaling mode

rakesh patel
2015-07-09T02:43:45Z

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How Metadata updates after data IO completion done? Write back mode does not support synchronization?

Is there any other feature ??

-----Original Message-----
From: "Dave Chinner" <david@fromorbit.com>
Sent: ‎07-‎07-‎2015 05:59
To: "Rakesh Patel" <patelrakeshcomp@gmail.com>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: regarding journaling mode

On Mon, Jul 06, 2015 at 11:38:32AM +0530, Rakesh Patel wrote:
> Hi,
>
> I come to know XFS is using writeback journaling mode.

Can you explain how you came to that conclusion?

> As per the
> journaling guide, writeback is unsafe which does not preserve data and
> metadata write synchronization.

What journalling guide would that be? Please quote your sources when
asking questions.

> I really want to know reason behind to choose writeback mode for journaling
> in XFS.

Metadata updates after data IO completion are used instead of
ordering data writeback operations through the journal.

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com

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