Jane,
I've got a two way 332Mhz silver node with 512M, AIX 433ML08, TSM 4.2.1.8
One FC card connected to 3494/2x 3590E and IBM ESS subsystem via SAN.
This machine flies along with the default parameters, with operations limited
by the capacity of a single CPU, the bandwidth of the PCI Bus or the speed of
the tape drives.
I did turn on workload manager the other day in passive mode in order to gather
some capacity stats, and immediately the performance degraded as the machine
started to thrash.
I've got AIX 4.3.3 ML10 maintenance going in this weekend, and I hope some
fixes in that will allow me to run WLM without killing the machine, but
basically, I can live without it.
Regards
Steve.
Steve Harris
AIX and TSM Admin,
Queensland Health, Brisbane Australia
>>> jane.bamberger AT BASSETT DOT ORG 16/09/2002 23:54:25 >>>
HI,
I am having the same problem on my tsm AIX SP2 silver wide server - but
with less memory - 512M - But tsm is the only application on the box - with
180 GB from an EMC Symmetrix and the rest 300+GB from SSA disks. My Maxperm
is at the default 80% - and the server crawls like molasses all the time.
Before the EMC disks were attached - I only had a problem during my TMS
database backup. Can you suggest an appropriate % to start at?
Thanks,
Jane
%%%%%%%%%%%%%%%%%%%%%%
Jane Bamberger
IS Department
Bassett Healthcare
607-547-4750
----- Original Message -----
From: "Hamish Marson" <hamish AT TRAVELLINGKIWI DOT COM>
To: <ADSM-L AT VM.MARIST DOT EDU>
Sent: Monday, September 16, 2002 9:05 AM
Subject: Re: TSM Server Paging: Need an AIX Paging Expert to Help
> Seay, Paul wrote:
>
> >Paging is a bad thing, but why would an AIX system page (like crazy)
under
> >this configuration?
> >
> >P660-6H1 2GB Memory
> >dsmserv using 384MB
> >Swap space is 3GB an only 12% used.
> >Nothing else seems to use much memory based on a ps -efl
> >
> >An old MVS person like myself would say somehow something has a free page
> >target that is really high. iostat and vmstat seem OK.
> >
> >Any AIX gurus know the answer?
> >
> >Paul D. Seay, Jr.
> >Technical Specialist
> >Naptheon Inc.
> >757-688-8180
> >
> >
> Without seeing anything else, I'd have to say it looks like your maxperm
> setting is too high. Do you have your databases on filesystems artehr
> than raw logical volumes?
>
> AIX uses spare memory for caching filesystem information. The paging
> process is the same as that used for file IO (i.e. the VMM). If the
> system is doing lots of fileIO, then active processes can be paged out
> and that memory used for file buffers. This is (Almost always) a bad
thing.
>
> The amount of memory that can be used for file buffers is controlled by
> several settings, the most important one is maxperm. That governs the
> maximum amount of physical memory that can be used by the system for
> file buffers. The default is 80%. Calculate what amount of memory you
> require for the processes that run, and drop maxperm down till you no
> longer have to page.
>
> To change maxperm, use the vmtune command
>
> /usr/samples/kernel/vmtune -P <percentage>
>
> WARNING!
>
> Because vmtune changes the running kernel, run it first with NO
> parameters to check that you get valid numbers. If someone has put a
> copy of vmtune on the system (WIthout installing it properly. i.e.
> copied it from another system) it can get out of sync with the kernel,
> and the system will crash if you attempt to change the values. (If it's
> wrong, most of them come up as -1).
>
> Hamish.
>
>
> --
>
> I don't suffer from Insanity... | Linux User #16396
> I enjoy every minute of it... |
> |
> http://www.travellingkiwi.com/ |
>
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