It it were me, I wouldn't trust rsync. The Hardlink tree is nasty
enough that 'rsync' will probably take longer than 'dd'. I'm not
familiar with using 'dump' and cannot comment. It's been quite some
time since I've considered this problem, and there may be newer methods
for making efficient block for block copies, but at the end of the day,
'dd' is a tool I've used over and over and trust.
This relatively recent article points out several methods for cloning a
disk, I've used Clonezilla, and know that its good at skipping empty
blocks on a disk, but I have no idea if it scales well to 200TB.
https://www.makeuseof.com/tag/2-methods-to-clone-your-linux-hard-drive/
On Wed, 2018-08-22 at 18:15 +0000, Nino Bosteels wrote:
> Hi,
>
> I had found some information online that with the --H option and
> rsync you preserve hardlinks?
>
> The data is mixed, v3-v4, so we still have hardlinks. Should we try
> to migrate these v3 to v4 before copying? Would it be faster?
>
> I read that instead of dd you could use dump, which actually is aware
> of free disk space for ext(3-4). Any ideas?
>
> And would it be an idea to let Nightlies run a couple of times?
>
> Thanks for your answer in any case ! It’s going to be.. weeks yeah :s
>
> Nino
>
>
>
> From: Ray Frush
> [mailto:fr...@rams.colostate.edu]
>
> Sent: Wednesday, August 22, 2018 7:06 PM
>
> To: backuppc-users@lists.sourceforge.net
>
> Subject: Re: [BackupPC-users] Copying backups to other host
>
>
>
>
> Nino-
>
>
>
>
>
> If your old BackupPC instance is version 3.x, then you're advised to
> use 'dd' to make a perfect image of the device that the cpool folder
> resides
> in. BackupPC 3.x uses extensive use of hardlinks, and the only
> reliable to copy the cpool is to take an image of the block device
> with 'dd'.
>
>
>
>
>
>
> BackupPC 4.x is a little more forgiving, and you may be able to move
> things with rsync.
>
>
>
>
>
> In either case, 200TB is a pretty large pool, and it's going to take
> some time to move that!
>
>
>
>
>
>
>
>
> --
> Ray Frush "Either you are part of the solution
> T:970.491.5527 or part of the precipitate."
> -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
> Colorado State University | IS | System Administrator
>
>
>
>
>
> On Wed, 2018-08-22 at 13:25 +0000, Nino Bosteels wrote:
>
> > Dear list,
> >
> > We’re trying to copy the backups from one instance to another to
> > use them as an archive, whilst starting a fresh backuppc on another
> > instance.
> >
> > But we’re not sure which folders to copy and even more so, how.
> > We’ve been using rsync –avzH –delete to copy the pc folder over.
> > But now we’re in doubt if that is sufficient? I think that we’d
> > need to copy the cpool
> > folder too (at least).
> >
> > Can anybody clarify? The sole resource (old) I found was somebody
> > suggesting to use dd.
> >
> > Thanks for your time and answer(s). We’re kind of stressing out,
> > since we’d like to cancel the subscription end of the month. And
> > we’re talking 200TB in the cpool folder !!
> >
> > Kr,
> > Nino
> >
> > -----------------------------------------------------------------
> > -------------
> > Check out the vibrant tech community on one of the world's most
> > engaging tech sites, Slashdot.org! http://sdm.link/slashdot
> > _______________________________________________
> > BackupPC-users mailing list
> > BackupPC-users@lists.sourceforge.net
> > List:
> > https://lists.sourceforge.net/lists/listinfo/backuppc-users
> > Wiki: http://backuppc.wiki.sourceforge.net
> > Project: http://backuppc.sourceforge.net/
> >
>
>
>
>
> -------------------------------------------------------------------
> -----------Check out the vibrant tech community on one of the world's
> mostengaging tech sites, Slashdot.org!
> http://sdm.link/slashdot_______________________________________________BackupPC-users
> mailing listBackupPC-users@lists.sourceforge.netList:
> https://lists.sourceforge.net/lists/listinfo/backuppc-usersWiki::
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> http://backuppc.sourceforge.net/
--
Ray Frush "Either you are part of the solutionT:970.491.5527 or
part of the
precipitate."-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-Colorado
State University | IS | System Administrator
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