Hi Paul,

the subfile cache doesn't hold the whole file, it holds signatures of
some
sort, probably a checksum for each page.  I use subfile for pst files.
My pst is
75 meg but the folder is 5 meg.

We went thru a conversion to outlook 2 years ago.  First, you're lucky
to be involved
before the conversion is done.  

The key is the attachments.  If the conversion from the old mail client
can leave
the attachments out of the pst then you will have much smaller pst
files.  Unfortunately
we loaded the attachments in.  As I said, I wasn't asked about the
conversion until
it was done.

Also, there are programs which extract attachments from the pst.  We use
EzDetach.  It helped a lot but the deployment of it wasn't completed so
we
have lots of psts > 2gig, some up to 10 gig.  Yes, they backup every
night.

I made a special management class for them with separate disk and tape
pool.
The tapes cycle faster because expiration deletes everything from them.

Good luck!

Bill Colwell
Draper lab



-----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: 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