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Re: Strange system behaviour when copying disks

To: Olaf Frączyk <olaf@xxxxxxxxxxxxx>
Subject: Re: Strange system behaviour when copying disks
From: Steve Lord <lord@xxxxxxx>
Date: 14 May 2003 11:14:23 -0500
Cc: Seth Mos <knuffie@xxxxxxxxx>, linux-xfs@xxxxxxxxxxx
In-reply-to: <1052928610.896.9.camel@venus>
References: <> <1052928610.896.9.camel@venus>
Sender: linux-xfs-bounce@xxxxxxxxxxx
On Wed, 2003-05-14 at 11:10, Olaf Frączyk wrote:
> On Wed, 2003-05-14 at 17:54, Seth Mos wrote:
> > May I suggest the following procedure for copying disks and information...
> Why it should be better?
> Doing 'cat' I have perfect copy of disk.
> You think that I will get lower latency with your scenario?
> > partition the second disk similar to your first.
> > Mount these partition under something like /mnt/new
> > And the other partitions underneath that... eg.
> > mount /dev/hdc1 /mnt/new
> > mount /dev/hdc5 /mnt/new/usr
> > 
> > After completing this procedure you can transfer the data.
> > 
> > (cd /;tar -cf - .)|(cd /mnt/new;tar -xf -)
> And all my ACLs go to hell :)
> BTW try to do it with NTFS partition :(
> > This will give you all files on the second disk. However you must reinstall 
> > lilo on this disk since it will not be in the same place anymore.
> These disks are not used for booting, OS etc.
> > Not it should not be enough to make it that severe. I suspect the dma issue.
> As I said earlier, they have DMA enabled.
> Regards,
> Olaf

Seth is suggesting copying the contents of the filesystem, not the
complete device. What you really need is xfs_copy implemented on
linux I think, failing that xfs_dump piped into xfs_restore which
will keep acls.



Steve Lord                                      voice: +1-651-683-3511
Principal Engineer, Filesystem Software         email: lord@xxxxxxx

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