Hi Farren, the main reason to backup data is to be prepared to restore them. If you want to make your restore faster, collocation is a good option. In an Enviroment without collocation, data for one client will spread over all tapes in the tapepool. At restore TSM will do this for every tape: Mount tape, wind forward to data location, read data, rewind tape, unmount tape. With collocation enabled you will reduce the number of tape mounts, this will save a reasonable amount of restore time. If you backup incremental only the data needed for restore are not continous on tape and this will happen at restore: Mount tape, wind forward to data location, read data, wind forward to next data location, read data ... (doing this for every little piece of data) ..., rewind tape, unmount tape. Make an extra selective backup from time to time to avoid/reduce this. It will make your restore even faster.
Greetings Jan Möwe Farren Minns <fminns@WILEY An: [EMAIL PROTECTED] .CO.UK> Kopie: Gesendet von: Thema: Help please with collocation "ADSM: Dist Stor Manager" <[EMAIL PROTECTED] RIST.EDU> 19.11.2001 12:34 Bitte antworten an "ADSM: Dist Stor Manager" Hello again TSMers I have some another questions, this time regarding collocation. At present we are backing up 21 client nodes and have a backup pool made up of DISKPOOL and TAPEPOOL. Then we have our off-site volumes, imaginatively entitled COPYPOOL. I am thinking that we do not necessarily need to use collocation for all of our nodes; maybe just for five or six of our more important ones (we do backup sets for these as well). The questions are as follows:- 1) What are peoples thoughts on collocation in the first place. Is it generally a good idea? Any thoughts really? 2) Secondly, can someone tell me a good, clean, simple way of achieving only collocating certain clients. 3) Also, baring in mind that at present, we back up all clients to one COPYPOOL, what would be the implications of a) moving some clients to a new backup COPYPOOL (what happens to all the data currently stored on the original COPYPOOL and b) turning off collocation for the original COPYPOOL (i.e. would this lead to a very long reclamation run). There is probably a lot more inf. that I should have included here, but I am relatively new and probably don't know the questions to ask. Thanks again and I look forward to any help you can all give me. All the best Farren Minns