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:DWIGHT.E.COOK AT SAIC DOT COM]
> Enviado el: jueves, 16 de mayo de 2002 9:43
> Para: ADSM-L AT VM.MARIST DOT EDU
> 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:ividal AT BIYCSA.COM DOT AR]
> Sent: Wednesday, May 15, 2002 4:50 PM
> To: ADSM-L AT VM.MARIST DOT EDU
> 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
>