Hi Steve,
To what adaptive subfile white paper do you refer? Subfile backup does
indeed back up the security attributes for files. Of course, questions such
as these can always be resolved by testing them out for yourself.
As to how effective subfile backup is for the types of files you mention, I
do not know for sure. It depends on how the underlying blocks of data are
changed on the disk. For example, if data is inserted at the front of a
file, that could cause all the blocks to appear as changed, so the next
subfile backup backs up the entire file. On the other hand, if you add data
to the end of an existing file, then the next subfile backup is more likely
to back up only those new blocks that were added. If changes to MS Access
files tend to change blocks throughout the file, then subfile backup might
not afford much benefit. For .pst files, I think other users have reported
success with subfile backup. You might try searching the ADSM-L archives
for earlier discussions on that subject.
Since Exchange is a TSM API application, and the API does not use subfile
backup, I do not understand the reference you mention.
Regards,
Andy
Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
Internet e-mail: storman AT us.ibm DOT com
IBM Tivoli Storage Manager support web page:
http://www-306.ibm.com/software/sysmgmt/products/support/IBMTivoliStorageManager.html
The only dumb question is the one that goes unasked.
The command line is your friend.
"Good enough" is the enemy of excellence.
"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 2005-12-27
18:50:33:
> Hi All
>
> Compliments of the season to all our regulars!
>
> I have a client with a largish file server on a Windows 2000
> Cluster. Analysis of a recent schedlog shows that on this particular
> day, 87% of the data backed up was .pst files, something that I'm
> sure is rather common where Outlook is the mail client.
>
> Now the obvious suggestion is to use Adaptive Subfile Backup for
> these and only back up the bits that have changed, but my boss
> pointed out that the Adaptive subfile whitepaper suggests that its
> use is not indicated for file servers. The reason given for this is
> that ASB cannot restore windows acls. Now on this file server all of
> the .pst files that I looked at inherited their permissions from
> their parents so, I'm thinking that for the average Joe user, this
> limitatioon would not be an issue. All restores on this system would
> normally be done by the administrator anyway.
>
> So, is the recommendation in the white paper correct? Do any of you
> use Adaptive Subfile with .pst files on file servers and if so have
> there been any issues?
>
> Also two supplementary questions. The next largest category of
> backups on this server is access databases. Again the whitepaper
> recommends against using adaptive subfile on these. Might I ask the
> same questions for .mdb files?
>
> Finally, I was looking at a Dave Canaan slide show from a 2003 Share
> conference where he explained how ASB works. There is one line in
> the powerpoint that states that Adaptive Subfile is also available
> for Exchange. I've searched through the TDP for Exchange
> documentation and can find no reference. Was this just a typo, a
> deleted feature or what?
>
> Regards and felicitations
>
> Steve.
>
> Steven Harris
>
> AIX and TSM Administrator,
> Brisbane Australia
> steve AT stevenharris DOT info
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