linux-xfs.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Todd Gill <tgill@redhat.com>
To: linux-xfs@vger.kernel.org
Subject: XFS over device mapper dm-thin device
Date: Fri, 2 Feb 2018 16:45:33 -0500	[thread overview]
Message-ID: <147a1764-1988-4efd-4f02-e942a1001b4e@redhat.com> (raw)


Hi,

I'd like to be able to take a snapshot of an XFS filesystem on top of
dm-thin.

The goal for the snapshot is:

    - fast to complete (couple seconds or better)
    - independent of origin (UUID updated?)
    - read/write

To satisfy the independent goal, I'm updating the UUID on the snapshot.
Currently "xfs_admin -U xxx" takes in the ballpark of 14 seconds on my
test system.

Is there a better approach to achieve the goals?  Or can the UUID update
be changed to be faster?

I realize the filesystem can be mounted with "nouuid" option, but would
prefer to avoid the possible trouble of duplicate UUIDs.

This is a test script I've used to illustrate the time of "xfs_admin -U":

https://pastebin.com/PFA5YRuH

Thanks for any help,
Todd

             reply	other threads:[~2018-02-02 21:45 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-02 21:45 Todd Gill [this message]
2018-02-02 22:35 ` XFS over device mapper dm-thin device Dave Chinner
2018-02-02 23:36   ` Eric Sandeen
2018-02-05 22:36     ` Dave Chinner
2018-02-05 22:37       ` Eric Sandeen
2018-02-06  6:11         ` Dave Chinner
2018-02-08  2:35           ` Eric Sandeen
2018-02-08  5:53             ` Darrick J. Wong
2018-02-08  8:25               ` Dave Chinner
2018-02-08 14:31                 ` Eric Sandeen
2018-02-08 21:11                   ` Dave Chinner
2018-02-09  1:39                     ` Darrick J. Wong

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=147a1764-1988-4efd-4f02-e942a1001b4e@redhat.com \
    --to=tgill@redhat.com \
    --cc=linux-xfs@vger.kernel.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;
as well as URLs for NNTP newsgroup(s).