All of lore.kernel.org
 help / color / mirror / Atom feed
From: Prasanna Kumar Kalever <pkalever@redhat.com>
To: xfs@oss.sgi.com
Cc: Brian Foster <bfoster@redhat.com>, Dave Chinner <dchinner@redhat.com>
Subject: How to copy files with preserving reflinks ?
Date: Fri, 26 Feb 2016 01:37:57 -0500 (EST)	[thread overview]
Message-ID: <957291997.53773945.1456468677495.JavaMail.zimbra@redhat.com> (raw)
In-Reply-To: <1112951359.53758727.1456466113255.JavaMail.zimbra@redhat.com>

Hi,

I have a VM file with reflinks to it, the reflinks were taken every night.

My question is how to copy/migrate all these file to a different xfs partition (which also have reflink enabled) without loosing the reflinks property, else may lead to copy all the shared blocks per file which will cost large disk space.

I have tried to copy them using rsync as below:

On Partition 1:

ActualFile.img -- [1] Actaul Size 10GB + [2] Append 2GB + [3] Append 1GB
ReflinkCopy1   -- [1] Actual Size  0  -- Shared blocks 10GB
ReflinkCopy2   -- [2] Actual Size  0  -- Shared blocks 12GB


I have first rsync the files into Partition 2 as below:

# cd PARTITION2

# rsync /PARTITION1/ReflinkCopy1 ActualFile.img
# du -sh ActualFile.img
10GB
# cp --reflink=always ActualFile.img

# rsync /PARTITION1/ReflinkCopy2 ActualFile.img
# du -sh ActualFile.img
12GB
# cp --reflink=always ActualFile.img

# rsync  /PARTITION1/ActualFile.img ActualFile.img

But the size used by partition was 35GB (verified using df -h) instead of 13GB 



Also, where can I find reflink related tools ?


Thanks,
-Prasanna ​ 


_______________________________________________
xfs mailing list
xfs@oss.sgi.com
http://oss.sgi.com/mailman/listinfo/xfs

       reply	other threads:[~2016-02-26  6:38 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1112951359.53758727.1456466113255.JavaMail.zimbra@redhat.com>
2016-02-26  6:37 ` Prasanna Kumar Kalever [this message]
2016-02-26  7:31   ` How to copy files with preserving reflinks ? Prasanna Kumar Kalever

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=957291997.53773945.1456468677495.JavaMail.zimbra@redhat.com \
    --to=pkalever@redhat.com \
    --cc=bfoster@redhat.com \
    --cc=dchinner@redhat.com \
    --cc=xfs@oss.sgi.com \
    /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.