A starting point for TSM data storage needs when moving from traditional backup methods can be calculated with these steps: 1. One full copy on tape 2. The amount of data backed up by one incremental backup multiplied by the greater of versions or the retention period. 3. multiply by 2 if you are using copy pools (everyone should IMHO) This is just an estimate, the number of tapes needed will vary due to empty space. In our case we have 3x the data on tape versus what is on the actual disks. Traditional backups had us at more than 9x. Andy
________________________________ From: ADSM: Dist Stor Manager on behalf of Matthews, Gary Sent: Thu 6/8/2006 5:00 AM To: [email protected] Subject: [ADSM-L] Retention Query Hi, Am a complete newbie when it comes to TSM and have just been handed a W2K3 system to look after with TSM 5.3. The system hasn't gone live yet and I'm trying to work out how many tapes I'm going to need for offsiting. We have four pools for onsite with the following setup Vers Data exits 28 Retain extra(days) 31 Vers Deleted 2 Retain Vers (days) 60 Do the copypools have the same characteristics? If I'm sending four tapes off a day how may tapes do I need for an offsite cycle ?? It's just that the company that set things up have said that 30 LTO-3s should be enough for onsite and offsite and I can't see how. TIA Gary (confused!) This e-mail and any attachment is for authorised use by the intended recipient(s) only. It may contain proprietary material, confidential information and/or be subject to legal privilege. It should not be copied, disclosed to, retained or used by, any other party. If you are not an intended recipient then please promptly delete this e-mail and any attachment and all copies and inform the sender. Thank you. This e-mail (including any attachments) is confidential and may be legally privileged. If you are not an intended recipient or an authorized representative of an intended recipient, you are prohibited from using, copying or distributing the information in this e-mail or its attachments. If you have received this e-mail in error, please notify the sender immediately by return e-mail and delete all copies of this message and any attachments. Thank you.
