Veritas NetBackup V5, currently in beta testing has builtin checkpoints for
resumption of failed jobs. I am still unsure of whether this functionality will
be extended to NDMP backups as well. Also, given the EMC ownership of Legato,
NetApp and Legato have sort of severed the relationship, and NetApp have now
gotten in bed with Veritas. So perhaps, we will see NDMP backups of NBU having
checkpointing as well. Note that checkpoint based resumptions will only be
available in Unix and Windows FileSystem based backups for obvious reasons.
HTH
Sumash
-----Original Message-----
From: Matt Temple [mailto:mht AT RESEARCH.DFCI.HARVARD DOT EDU]
Sent: 06 January 2004 08:47 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Chronic NDMP backup problems -- BACKUP
CHECKPOINT?
Matthew Huff wrote:
> We are having a chronic problem with reliable backups of our NetApp NAS
> filers using Legato. Since NDMP uses the integrated dump within the
> NetApp, if there are any unrecoverable errors on the NAS attached tape
> drives, the entire dump is aborted. Since we have close to a Terrabyte
> on each of our Netapps, we seem to be having continual problems getting
> a level 0 (full) backup. Many times it will get 90% through and then
> fail randomly on a SCSI tape write error.
>
Matthew,
Even if you didn't have this "shoe-shining" issue, you'd still
have the same problem we and others face -- what happens when a really
big saveset aborts 2/3 of the way through? What do you do with the old
tapes, etc. As far as I know, no backup system reliable checkpoints
so it can resume where it left off. If anyone reading this list knows
better, it would be useful to know. The issues are obviously large,
since the checkpoint may well be dealing with a file system that has
changed in some way. How do you resume? (Of course, Networker
backs up file systems that are changing all the time.)
Has anyone out there heard of such a thing? This will get more and
more critical as we move towards the terabyte as the unit of storage
currency.
Matt Temple
--
=============================================================
Matthew Temple Tel: 617/632-2597
Director, Research Computing Fax: 617/582-7820
Dana-Farber Cancer Institute mht AT research.dfci.harvard DOT edu
44 Binney Street, LG300/300 http://research.dfci.harvard.edu
Boston, MA 02115 Choice is the Choice!
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