|
Re: [BackupPC-users] Block-level rsync-like hashing dd?
2011-04-12 21:55:44
Chris Parsons <Chris.Parsons AT petrosys.com DOT au> wrote
on 04/12/2011 07:36:26 PM:
> On 13/04/2011 5:13 AM, Timothy J Massey wrote:
> To slightly expand what Les wrote: there
are 4 realistic options
> (for a very loose definition of "realistic"):
>
> 1) rsync the pool.
> 2) LVM Snapshot/dd
> 3) Break a RAID array
> 4) Run two separate BackupPC servers, both backing up the same server.
>
> You missed options 5 and 6.
> 5) Run on Solaris or Opensolaris using NFS.
ZFS.
> Make regular NFS
> snapshots (cheap) and send the snapshots to a remote Solaris
> machine. NFS even allows you to send the delta's between snapshots.
This is a superset of 2, substituting ZFS for LVM.
I'm not saying that there aren't further advantages of ZFS over LVM,
but it's a variation of #2.
If that offends you, then rename #2 as "Volume/Filesystem
snapshots with dd" and put whatever snapshotting technology you want
in there.
Remember, you have to get them to another machine,
so ZFS or any other snapshot by itself won't finish the job: you then need
to copy them somewhere else. This includes SAN based solutions (though
in that case, "somewhere else" might just be defined as a different
storage shelf...).
> (Got lots of memory, or a ssd log device? Disable backuppc's pool
> and rely on NFS block level de-duplication instead.)
You can't disable BackupPC's pool. And if you
did, you would no longer have BackupPC. So completely irrelevant
for this conversation! :) (Besides, we're not trying to build
BackupPC at the block leven here. We're trying to slightly extend
BackupPC.)
> Our current option would now be number 6 on this
list. An archive host.
> 6) Archive Host. Backups run at night, during the day, backuppc
> archives itself to the archive host. Tar files of all the backups
> sit on a remote server - full remote backups of everything on the
> backuppc. An instant replacement for tape.
While archives are very valuable (and I use them for
off-site protection as well), they are not an answer to the question, which
is how to duplicate the entire *pool*. This duplicates a single *backup*,
not the pool.
So, I stick by my 4 options, with one of them possibly
slightly renamed.
Timothy J. Massey
------------------------------------------------------------------------------
Forrester Wave Report - Recovery time is now measured in hours and minutes
not days. Key insights are discussed in the 2010 Forrester Wave Report as
part of an in-depth evaluation of disaster recovery service providers.
Forrester found the best-in-class provider in terms of services and vision.
Read this report now! http://p.sf.net/sfu/ibm-webcastpromo _______________________________________________
BackupPC-users mailing list
BackupPC-users AT lists.sourceforge DOT net
List: https://lists.sourceforge.net/lists/listinfo/backuppc-users
Wiki: http://backuppc.wiki.sourceforge.net
Project: http://backuppc.sourceforge.net/
|
|
|
