It is a misconception that using collocation means you have to dedicate one tape per cleint.
As the previous poster noted, you can implement collocation by group in TSM 5.3. Prior to 5.3, you could always control the amount of tape collocation uses by setting the MAXSCRATCH parm on your storage pool. If you have 100 clients, and set MAXSCRATCH to 25, then TSM will stack (approximately) 4 clients per tape. Pro: Less work (as in INSTANT) to implement than collocation groups. Con: You have to keep and eye on your MAXSCRATCH parm. As the amount of data in your library grows, you will naturally have to increase MAXSCRATCH. Wanda Prather "I/O, I/O, It's all about I/O" -(me) -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Gill, Geoffrey L. Sent: Friday, December 16, 2005 12:08 PM To: [email protected] Subject: lto2's and TSM 5.3 I'd like to ask those who are using the LTO2 drives with TSM 5.3 a few questions and some advice. I'm in the process of building a system to replace the one I have. It will run AIX5.3 and TSM 5.3. My plan is to keep the old system around and let the data expire off but lets talk about the new system. Because I have little experience with 5.3 maybe those that are using it can give me some advice. Because these tapes hold so much data, using collocation as it is on TSM 5.2 seems a bit much, one tape per node. I have heard a little about the way collocation has changed but for those using it on 5.3 would you relay your experiences and recommendations. Disk pools and tape drives will not be an issue but with almost 300 nodes the system will be busy at times. Please relay your experience as to how you run schedules. Do you have any nodes/schedules that run direct to tape? Archives. Do you keep a second copy offsite or are they just sent offsite and recalled if needed for reclamation or retrieval of data? Anything you would do differently if you had the chance to redo your system? Any other recommendations with TSM 5.3? I have a windows server already running TSM 5.3 just so I can take a look at it. No tape drives just a bit of disk to run a couple of desktop computers to as a test. It is also running the admin console and my plan is to leave it there and not install it on the TSM server. Thanks for the advice and help, Geoff Gill TSM Administrator SAIC M/S-G1b (858)826-4062 Email: <mailto:[EMAIL PROTECTED]> [EMAIL PROTECTED]
