ADSM-L

Re: TSM altering Windows access time?

2006-10-30 13:46:37
Subject: Re: TSM altering Windows access time?
From: Andrew Raibeck <storman AT US.IBM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 30 Oct 2006 11:45:12 -0700
Yes, you can use a client option set to configure this option.

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.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 10/30/2006
11:31:07 AM:

> I was hoping I could set 'PRESERVELASTACCESSDATE YES' at the server
> level like in a client option set, but I don't think I can.
>
> Do you know of an easy way to update 2500 clients without logging on to
> each one and updating the dsm.opt or inclexcl.def?
>
> -----Original Message-----
> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf 
> Of
> Andrew Raibeck
> Sent: Monday, October 30, 2006 1:27 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Re: TSM altering Windows access time?
>
> Access time is not modification time. Access time means the last time
> someone touched a file. For example, if you use Windows Explorer to view
> a file's properties, the access time will automatically be updated. This
> is not something the application does explicitly, but is a function of
> the file system.
>
> So the TSM client does not change the modification time; this just
> happens implicitly because the client reads the file during backup. In
> most cases, it is not an issue (technically speaking), but for HSM-like
> products, it can have an impact. Hence the option I mentioned.
>
> > Wait, the docs say that the TSM client will do an "update" on a file
> > if the "last access time" is changed between backups.
>
> Can you point me to where this is stated? I don't see it in the client
> manual (I'm looking in chapter 4, section "Full and partial incremental
> bacukp").
>
> 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.ibm.com/software/sysmgmt/products/support/IBMTivoliStorageMan
> ager.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 10/30/2006
> 11:08:29 AM:
>
> >    So the TSM backup client ~does~ change the last access time??!?!?
> > That's not what I have been telling folks....
> >
> >
> > Wait, the docs say that the TSM client will do an "update" on a file
> > if the "last access time" is changed between backups. If the TSM
> > client itself is changing the last access time, wouldn't that mean
> > that every night the TSM server would "update" every file on the host
> > because it is changing the last access time every time it runs?
> >
> >    I've looked around on various hosts and can see there are old files
>
> > that have backups run on them every night but have access times that
> > are 4 years old.
> >
> >    Can you explain a little better the conditions that TSM will change
>
> > the "last access time"?
> >
> >    Is it updated perhaps every time that the TSM has to actually
> > backup the file because it has changed? In that case should I expect
> > to see the "modification time" and the "access time" on a changed file
>
> > be up to 1 day apart if the TSM backups run once a day on the host?
> >
> >
> > Thanks,
> > Ben
> >
> >
> >
> >
> > -----Original Message-----
> > From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
> > Of Andrew Raibeck
> > Sent: Monday, October 30, 2006 10:47 AM
> > To: ADSM-L AT VM.MARIST DOT EDU
> > Subject: Re: TSM altering Windows access time?
> >
> > See the PRESERVELASTACCESSDATE client option.
> >
> > 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.ibm.com/software/sysmgmt/products/support/IBMTivoliStorageM
> > an
> > ager.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 10/30/2006
> > 10:03:59 AM:
> >
> > >    I'm being told by various vendors that the TSM backup client on
> > > Windows causes problems with their ILM  products, the ones that move
>
> > > older, unaccessed data to cheaper storage.
> > >
> > >    They are saying that the TSM backup client will alter the last
> > > access date, making it look like the file is being access when it's
> > > only being backed up.
> > >
> > >    Has anyone seen this? I'm not sure if they are saying that the
> > > TSM client does this on the first full backup or on the subsequent
> > > incrementals.
> > >
> > >    I am going to do some testing to see what I can see, but was
> > > wondering if  anyone has seen this behavior...
> > >
> > > Ben