Dwight: LTO is performing good enough (for us), and we only have 1 drive. I was reading all hints exposed in the list, many of them have been implemented during last 2 months. We're using a disk storage pool, client compression, etc. I realize that we can explore a bit more resourceutilization parameter...
Thanks Ignacio > -----Mensaje original----- > De: Cook, Dwight E [mailto:[EMAIL PROTECTED]] > Enviado el: jueves, 16 de mayo de 2002 9:43 > Para: [EMAIL PROTECTED] > Asunto: Re: Tuning TSM > > > Run multiple concurrent client sessions... > Run with TSM client compression... > Go to disk first (to help facilitate the multiple concurrent > sessions seeing > how you only have one drive)... > Get another drive ! ! ! (will really help when you have to > run reclamation) > I'm partial to 3590's but lots of folks are running LTO's > for backups, look into resourceutilization > for archives, just fire off multiple, if backing up a large DB run 25+ > concurrently > we archive a 3.1 TB SAP data base in 20 hours running 25 > concurrent sessions > with TSM client compression (compresses the info down to > about 800 GB) and > back over 100 Mb/sec fast ethernet (@ 40 GB/hr) across GigE > we run about 70 > GB/hr so do the same work in just 12 hours (or so)... > > > just my 2 cents worth > > Dwight > > > > -----Original Message----- > From: Ignacio Vidal [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, May 15, 2002 4:50 PM > To: [EMAIL PROTECTED] > Subject: Tuning TSM > > > Hi: > I'm managing a pretty small TSM installation with 4 RS/6K machines (2 > 6M1 and 2 6H1) running AIX 4.3.3 (ML9). > TSM software consists of the server (running in a 6M1 - 7Gb RAM), and > the clients running in the same machine and on the others. > > I´ve got the following situation: > - the total of data backed up is about 200Gb's, > - 4 servers are connected using gigabit ethernet links (and > have 6Gb RAM > and 7Gb RAM each model 6H1 and 6M1 respectively) > - TSM uses a storage pool of 240Gb on FastT500 disks (those are > connected by FC channels) > - TSM uses a 3581 library (LTO) with 1 drive, > > The fact is (for the same set of information): > When I do an archive backup operation with TSM, the time > elapsed rounds > 5 hours (TSM writes "right to" the tape). > When I do an incremental backup operation, TSM uses about > 6:30hs for it > (TSM writes to storage pool). > > I'm looking for a rational approach to solve this "problem": isn't it > more fast writing to storage pool (disk) that to tape? > > Anyone had the same performance problem? > > Is it really a performance problem? > > I would like some commentaries about this, I can provide some > info about > the configuration of TSM and the AIX servers. > > Regards > > Ignacio >