Lindsey:
I've been walking around once and again about networking configuration,
then with disk i/o performance, then with how is configurated on disk
the storage pool (if it was in raid 5, or in raid 1 or in raid 10...).

Those servers are connected through gigabit ethernet channels, and they
are offering from 50 to 75 MBytes/sec. I believe that throughput is very
low, but Tivoli's people (here) insisted in other factors (disk i/o,
configuration of raids, etc)

I'll try your reccomendation, I have not all neccesary values from our
switches now.
Thanks

Ignacio

> -----Mensaje original-----
> De: lt [mailto:horse AT AUSTIN.IBM DOT COM]
> Enviado el: Miércoles, 15 de Mayo de 2002 19:42
> Para: ADSM-L AT VM.MARIST DOT EDU
> Asunto: Re: Tuning TSM
> 
> 
> Hi,
>  Be sure to set "ALL" parameters for the nic cards correctly 
> to match the 
> ports on the switches.
>  Ensure that "ALL" 'no options' are set correctly for your 
> environment.
> 
> Example:
>  AIX 433_ML_08:
>   100MB ethernet nic cards have the xmit/recieve buffer pools 
> maxed out
>   100MB ethernet nic cards have the speed/duplex set to match 
> switch ports
>   'no options' are set via an /etc/rc.{filename} & called via 
> /etc/inittab via:
>   rctunenet:2:wait:/etc/rc.tunenet > /dev/console 2>&1 #Tune 
> Network Parms
>    example:
>     /etc/rc.tunenet
>      if [ -f /usr/sbin/no ]
>      then
>      thewall=$(/usr/sbin/no -o thewall | awk '{ print $3 }')
>      if [ $thewall -lt 4096 ]
>      then
>      /usr/sbin/no -d thewall
>      else
>      print thewall is set to $thewall - left as is
>      fi
>      /usr/sbin/no -d thewall
>      /usr/sbin/no -d sb_max
>      /usr/sbin/no -o tcp_sendspace=$thewall
>      /usr/sbin/no -o tcp_recvspace=$thewall
>      /usr/sbin/no -o udp_sendspace=64000
>      /usr/sbin/no -o udp_recvspace=64000
>      /usr/sbin/no -o net_malloc_police=32768
>      /usr/sbin/no -o tcp_mssdflt=1452
>      /usr/sbin/no -o ipqmaxlen=150
>      /usr/sbin/no -o rfc1323=1
>      fi
>      print "Network parameters tuned..."
>  By allowing AIX_ML_08 to "figure out" the best settings for 
> thewall/sb_max, no -d thewall/sb_max, I do not have to go 
> thru the issue 
> of calculating it anymore!!!
>  Having gone thru the above scenario, my 100MB ethernet cloud 
> performs 
> at, a minimum, 10MB/sec. A lot of the network traffic is logged at: 
> 11MB/sec.
>  We are now implementing a GIG ethernet network and I am 
> looking forward 
> to working with it as well.
> 
> HTH.
> 
> 
> Mr. Lindsey Thomson
> BLDG:042/2F-065 IMA: 0422F065
> 11400 Burnet Rd.,  Austin, TX 78758
> off) 512) 823 6522 / (TL) 793 6522
> 
> "I never waste memory on things that can easily be stored 
>  and retrieved from elsewhere."    - Albert Einstein
> "Blessed is the nation whose God is the Lord" - Psalm 33:12
> "Time is a great teacher, but unfortunately it kills all 
>  its pupils"    - Hector Berloiz
> 
> On Wed, 15 May 2002, Ignacio Vidal wrote:
> 
> > 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
> > 
>