Hi Paul, I haven't installed 6.2 yet so I haven't tested client side dedup (CSD). But I don't think I would apply it to PST files anyway. CSD doesn't solve the problem of chunk expiration. But if the network folk told me the network was overloaded and could prove that backups were the problem, then yes I would try CSD.
6 years ago Draper Lab was using Eudora for an email client. Eudora detached attachments to a folder where they were backed up once; backups of email were not a problem for TSM. But then we wanted to get into calendaring. So we tried the Oracle Collaboration Suite which required outlook as a client. So everyone's Eudora folders were sucked into PST files. Since our users are not restricted about how much email to keep, they kept pretty much every email and still do. The result was huge PST files; there are 100's of PST files larger than 10 GB. Of course there was no planning for backing up the new PST files; I had to scramble. I directed them to a separate storage hierarchy and changed the policy from 10-90-5-180 to 3-7-5-180 to expire them much quicker. This made for a pool of tapes which rolled over quicker so I could keep my media expenses under control. My current policy on v6 is very similar. Well, the OCS was a failure so in came Exchange about 5 years ago. My idea of the best way to deal with PST files is to ban them entirely. Instead have unlimited quotas in Exchange and deploy an exchange backend archiving product to keep the exchange db manageable. Some of the mail managers think this is a good idea too, but we are now in the midst of a drawn out exchange 2010 implementation so there are no resources to get serious about an archiving backend. Thanks, - bill -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ads...@vm.marist.edu] On Behalf Of Paul Zarnowski Sent: Tuesday, November 16, 2010 1:42 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: De-dup ratio's By using source-mode deduplication, you could avoid backing up the entire PST files every day. We've just introduced Exchange here, within the last year, and are still figuring out the best way to deal with PST files. At 10:51 AM 11/16/2010, Colwell, William F. wrote: >But I won't start deduping PST's again because they are backed up every >day and I only keep 3 versions >so why do all the dedup effort only to have to go thru the chunk >deletion effort 3 days later? >Then I would have to reclaim the volumes to actually get the space back. -- Paul Zarnowski Ph: 607-255-4757 Manager, Storage Services Fx: 607-255-8521 719 Rhodes Hall, Ithaca, NY 14853-3801 Em: p...@cornell.edu
