From: Dave Chinner <david@fromorbit.com>
To: Linda Walsh <xfs@tlinx.org>
Cc: xfs-oss <xfs@oss.sgi.com>
Subject: Re: xfs_freeze same as umount? How is that helpful?
Date: Fri, 5 Oct 2012 09:32:04 +1000 [thread overview]
Message-ID: <20121004233204.GB23644@dastard> (raw)
In-Reply-To: <506E1025.8050605@tlinx.org>
On Thu, Oct 04, 2012 at 03:39:33PM -0700, Linda Walsh wrote:
> Greg Freemyer wrote:
> >Conceptually it is typically:
> >- quiesce system
> ----
> Um... it seems that this is equivalent to being
> able to umount the disk?
NO, it's not. freeze intentionally leaves the log dirty, whereas
unmount leaves it clean.
> When I tried xfs_freeze / fs_freeze got fs-busy -- same as I would
> if I tried to umount it.
Of course - it's got to write all the dirty data andmetadata in
memory to disk. Freeze is about providing a stable, consistent disk
image of the filesystem, so it must flush dirty objects from memory
to disk to provide that.
> I thought the point of xfs_freeze was to allow it to be brought to
> a consistent state without unmounting it?
Exactly.
> Coincidentally, after trying a few freezes, the system froze.
Entirely possible if you froze the root filesystem and something you
rely on tried to write to the filesystem.
Anyway, a one-line "it froze" report doesn't tell us anything about
the problem you saw. So:
http://xfs.org/index.php/XFS_FAQ#Q:_What_information_should_I_include_when_reporting_a_problem.3F
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2012-10-04 23:30 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-04 15:30 get filename->inode mappings in bulk for a live fs? Linda Walsh
2012-10-04 18:01 ` Greg Freemyer
2012-10-04 18:29 ` Linda Walsh
2012-10-04 18:59 ` Greg Freemyer
2012-10-04 22:39 ` xfs_freeze same as umount? How is that helpful? Linda Walsh
2012-10-04 23:32 ` Dave Chinner [this message]
2012-10-05 0:10 ` Linda Walsh
2012-10-05 0:36 ` Dave Chinner
2012-10-04 22:49 ` get filename->inode mappings in bulk for a live fs? Dave Chinner
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20121004233204.GB23644@dastard \
--to=david@fromorbit.com \
--cc=xfs@oss.sgi.com \
--cc=xfs@tlinx.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox