We use 3 RAID-5 groups with 24 random disk volumes each and they are faster than the Ethernet (2x1gb) during the backups and are fast enough during migration to meet our needs. Since we are not migrating to physical tape I have not tracked the performance, only if it was done in time. You can have multiple clients backup to a random disk volume. At our peak backup time we have over 100 clients running.
Andy Huebner -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[email protected]] On Behalf Of Skylar Thompson Sent: Tuesday, May 19, 2009 9:47 AM To: [email protected] Subject: Re: [ADSM-L] big striped TSM volume performance Mehdi Salehi wrote: > 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. My experience on Linux is that having multiple, separate RAID groups is better than having one giant RAID group. You get better reliability since you have more failure groups, and better performance since you spread your disk contention out more. I can't find the source to back it up, but I think even for random-access DISK volumes only one client can be doing I/O at a time to any given volume. This means that creating multiple DISK volumes per RAID group will give better performance. -- -- Skylar Thompson ([email protected]) -- Genome Sciences Department, System Administrator -- Foege Building S048, (206)-685-7354 -- University of Washington School of Medicine 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.
