Take a look at this link to a presentation given by one of the TSM Developers at the Oxford Symposium a couple of years back which will answer one or two of your questions and give some IBM recommendations for best performance on different disk subsystems and layouts >>> http://tinyurl.com/qv35v8
Part of the answer below may also depend upon what you mean by 'big TSM volume' - a random access DISK volume, or a sequential access FILE volume? HTH, /David Mc London -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ads...@vm.marist.edu] On Behalf Of Mehdi Salehi Sent: 19 May 2009 10:12 To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] big striped TSM volume performance Hi, Which one performs better in TSM for AIX: 1- using one big TSM volume on a big striped filesystem 2- using multiple smaller TSM volumes each on a separate filesystem (each filesystem resides on a separate hdisk) (in either case, disks are RAID protected in disk subsystem layer) I assumed that TSM does not lock a volume while a client is sending backup data to it such that other clients can read/write from/to this volume simultaneously. Correct me if I am mistaken, please. Thanks so much, Mehdi Salehi