I believe there is a mistake here.

I believe that the cache is only used to cache the ccw's for blocks. The reason 
for the 2gig limit was given a long time ago on this list by a TSM dev, they 
use a windows api to map the file in virtual memory for i/o. The api they use 
has the 2 gig limit.

We use the sub file feature for windows servers located in remote offices, and 
it really does help. but it would be even better if it could handle file that 
are greater than 2gig.

I suspect if they come up with a general dedup feature, that this would replace 
the sub-file feature. And one would hope that it will do files of any size.

It will be interesting to see what it looks like.

len
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Paul Zarnowski
Sent: Thursday, February 14, 2008 11:16 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Backing up PST files

At 11:04 PM 2/13/2008, Wanda Prather wrote:
>Subfile backup was designed to work on laptops, not servers.

Yes, that is what we are trying to do.  Sam, on the other hand....

>The "base" or initial backup copy of a file is stored in a cache directory
>on the client, which is also limited in size to 2 GB.

I didn't realize the cache directory was limited in size and that it held
complete copies of files.  Checking this, it seems you may be correct about
full copies of files being made in the cache directory.  The size of the
cache directory is only 1GB according to the Users Guide, and that is what
the EditPreferences GUI restricts you to as well....  I don't understand
how subfile backup can work for files up to 2GB in size, if the
subfilecachesize is restricted to 1024 MB.

>In short, you can only manage a total of about 2 GB of files for subfile
>backup, and only files less than 2 GB in size are eligible.

Bummer.  Thanks Wanda.

..Paul


--
Paul Zarnowski                            Ph: 607-255-4757
Manager, Storage Services                 Fx: 607-255-8521
719 Rhodes Hall, Ithaca, NY 14853-3801    Em: psz1 AT cornell DOT edu