Be careful using virtual volumes for backupsets. A backupset is not a recognized type of virtual volumes and if you run the RECONCILE VOLUMES command, the virtual volume will be deleted, but not the backupset reference to it. If you can absolutely guarantee that no one will ever run the RECONCILE VOLUMES command, virtual volumes would be good for backupsets, as you're not wasting a entire tape volume for a small node.
Unless Tivoli changed this since I did initial testing back when 5.1 first came out... Bill Boyer "Hit any user to continue!" - ??? -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Joerg Pohlmann Sent: Thursday, February 13, 2003 9:37 PM To: [EMAIL PROTECTED] Subject: Re: Estimating size of backup sets Graham, an estimate is the sum of (capacity * percent utilized) for the filespaces for a given client if you are including all filespaces in your GENERATE BACKUPSET. Realize that if you are using a tape device class, the minimum amount of media is one tape cartridge per backupset. So, for small clients, you may have a low utilization for backupset tapes. In your case, you will have a minimum of 700 tapes for the backupsets. You may want to consider a non-tape device class, such as a server device class if you have multiple TSM servers, or even setting up a virtual volume environment on a single TSM server as backupsets are then archive objects (that is virtual volumes) that can co-reside on a physical tape. The amount of space is then the sum of capacity * percent utilized for all 700 clients in MB - you can then take the capacity of the tape media to calculate the actual amount of space required. Use the capacity you achieved for full tapes as a realistic capacity. Joerg Pohlmann 604-535-0452 Graham Trigge <[EMAIL PROTECTED]> Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> 2003-02-13 14:35 Please respond to "ADSM: Dist Stor Manager" To: [EMAIL PROTECTED] cc: Subject: Estimating size of backup sets TSMers, Is there anyway people know of to estimate how large a backupset is going to be? I have close to 700 nodes I want to generate backupsets for and I want to know what sort of space I will be using up with them. I am assuming it will be some sort of SQL statement looking at active files, but I can't figure it out past that. Any help would be appreciated. Regards, ---------------------------------------------------------------------------- -- Graham Trigge IT Technical Specialist Server Support Telstra Australia Phone: (02) 9882 5831 Fax: (02) 9882 5993 Mobile: 0409 654 434 ---------------------------------------- The information contained in this e-mail and any attachments to it: (a) may be confidential and if you are not the intended recipient, any interference with, use, disclosure or copying of this material is unauthorised and prohibited. If you have received this e-mail in error, please delete it and notify the sender; (b) may contain personal information of the sender as defined under the Privacy Act 1988 (Cth). Consent is hereby given to the recipient(s) to collect, hold and use such information for any reasonable purpose in the ordinary course of TES' business, such as responding to this email, or forwarding or disclosing it to a third party.