In the "best practices" document from DataDomain http://www.datadomain.com/pdf/GlassHouse-TSM-DataDomain-Whitepaper.pdf and what other things I read, it sounded like the VTL "mimicry" is not really needed in a TSM environment unless you are doing lan-free or NDMP backups. This shop does neither, so there was no need to buy the VTL option. I just made deviceclasses and storagepools and slipped it into the storage pool hierarchy.
You are also dead on for the analysis. They recommend that you create storagepools for the various types of data to keep track of what kind of compression you are getting. In our case, it was "databases", "fileservers" and "archives". Our installer said some folks go much more granular, even as far a 1 storagepool per host, but I didn't want to create a nightmare in storagepools, so I kept it simple. Each storage pool on the TSM server points to a different directory on the DataDomain appliance, and the appliance can tell you what the compression rates are: overall, for each filesystem on the appliance, and even for each "FILE" the TSM server creates. With that data and a drill-down using the "q content" command you can pick out the uncooperative data. Ben -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Paul Zarnowski Sent: Tuesday, February 26, 2008 4:04 PM To: [email protected] Subject: Re: [ADSM-L] TSM dream setup Ben, First, thanks for sharing your experiences. Very enlightening. I'm curious why you decided to use devclass=file volumes, instead of using the DD580 as a VTL. It does have a VTL personality, doesn't it? At 05:39 PM 2/26/2008, Ben Bullock wrote: >TSM config - Easy. Created some "FILE" device classes and pointed them >to the NFS mount points. You also did some analysis about what type of data got what level of reduction. How did you go about testing this? Do you use separate storage pools to segregate the data and then run a test? I don't see any other way to do it. Thanks. ..Paul -- Paul Zarnowski Ph: 607-255-4757 Manager, Storage Services Fx: 607-255-8521 719 Rhodes Hall, Ithaca, NY 14853-3801 Em: [EMAIL PROTECTED] The BCI Email Firewall made the following annotations --------------------------------------------------------------------- *Confidentiality Notice: This E-Mail is intended only for the use of the individual or entity to which it is addressed and may contain information that is privileged, confidential and exempt from disclosure under applicable law. If you have received this communication in error, please do not distribute, and delete the original message. Thank you for your compliance. You may contact us at: Blue Cross of Idaho 3000 E. Pine Ave. Meridian, Idaho 83642 1.208.345.4550 ---------------------------------------------------------------------
