Hi Steven,
VCB cuts the virtual disk file in 2 GB slices so that should be no
problem. Using subfilebackup is actually the IBM-recommended way do
vcb fullvm backups. See TSM 5.4 & 5.5 Technical Guide
(http://www.redbooks.ibm.com/redbooks/pdfs/sg247447.pdf)
p. 346:
"Before performing the Tivoli Storage Manager backup, we will enable
subfile backup. Subfile backup is optional; however the fullvm
operation is an ideal application for this function."
Unfortunately they don't say anything about restore when using subfile
backup. It would be really annoying having one basefile and 320 daily
subfile deltas all of which have to be collected by TSM from various
tapes. That would be really no fun, I suppose... :-(
kind regards,
Stephan
On Sun, Mar 29, 2009 at 11:10 PM, Steven Harris <sjharris AT au1.ibm DOT com>
wrote:
> Stephan
>
> Are you aware that there is a 2GB architectural limit on subfile backups?
> so all your files would need to be smaller than that.
>
> Steven Harris
> TSM Admin, Sydney Australia
>
>
>
>
> Stephan Boldt
> <stephan.boldt+ad
> sm-l AT GMAIL DOT COM>
> To
> Sent by: "ADSM: ADSM-L AT VM.MARIST DOT EDU
> Dist Stor cc
> Manager"
> <[email protected] Subject
> .EDU> [ADSM-L] Question regarding
> subfilebackup
>
> 29/03/2009 09:47
> PM
>
>
> Please respond to
> "ADSM: Dist Stor
> Manager"
> <[email protected]
> .EDU>
>
>
>
>
>
>
> Hello!
>
> I'm considering using subfilebackup together with a fullvm vcb backup
> (because there are few changes but huge virtual disk files), but I'm
> unsure what happens when the basefile expires.
>
> Example:
> - I want to keep 3 versions of these files.
> - First backup is obviously the basefile
> - Second and third backup is a small delta
>
> What happens when the fourth backup runs? The first backup should
> expire, but where is the basefile then? Will the basefile be kept as
> long as there are delta-backups depending on it? Will the second
> backup be merged with the basefile and by that become a new
> "synthetical" basefile?
>
> Thanks in anvance for your help!
> Stephan
>
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