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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.