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IDS Forum

RE: Poor performance on replacement server

Posted By: Ravi T
Date: Wednesday, 14 December 2005, at 12:50 p.m.

In Response To: RE: Poor performance on replacement server (simon@coynes.eclipse.co.uk)

Hi Simon,

More comments, suggestions and thoughts :

1. It seems all rootdbs, physdbs and logdbs mapped to the same disk/partition if I am not confused. Check and see if the DS25 is mapped the same way. (I bet you that it is not, just kidding) I would put the rootdbs on its owb partition, nothing else just the rootdbs and then put logdbs in its own partition as well.
2. Check the /etc/system files in both boxes and see if the memory parameters are set differently for the OS
3. If/when ever /etc/system file is changed it requires an OS reboot for the changes to take effect
4. Are the MHZ on the CPUs in both boxes the same?
5. Run ipcs command during the lock up/ slow down and see if OS is having some memory allocation issues or memory segment issues. When you run the ipcs command you will see the segments cearly, compare them in both boxes and see if you see adverse behavior in the new box
6. Also, see if the message portion of the memory in the old box, DS25 is larger than the one in the new box
7. Also, I remember someone had suggested to set NOAGE, it is a good thing.
8. 9.3.FC3 check for the bugs, ask the support guys to check and give you the bug lists for 9.3.FC3, I know in one shop I was in we upgraded to 9.3.FC4 because we didn't want to deal with the problems we were getting with FC3. They may ask you to upgrade to 9.4 since some of the 9.3 versions are desupported now (I think).

Hope these helps.

Ravi.

simon@coynes.eclipse.co.uk wrote:
Thanks to everyone for their replies. First, I've been a bit of a clot and given
the wrong ONconfig file; I took the config from the old server. It is not much
different and indeed the changes are around MULTIPROCESSOR and the number of CPU
VPs. (I've also changed the LRUMAX & MIN entries and the amount of DS_MEMORY.
However, generally, they are very similar. My intention was to get the thing
working and then tune it up properly.)

Taking peoples comments and questions

Could it be locking? Possibly. I cannot say with any certainty because I cannot get
a response from a query to sysmaster because the CPUs are maxed out. However, the
application (both 4GL and browser based) haven't changed at all; it is the same
programs attaching to both systems. We do experience some problems on the DS25 with
locking, but not like this.

Multiprocessor support - I've tried this both ways around with no variation in
performance.

onstat information - Unfortunately, management took the decision to back the change
out and we are now back on the DS25. Therefore collecting current stats is
impossible.

Is it an OS problem? I'm not convinced; as I said in my original post, if IDS is
taken out of the equation, the OS seems to be OK. Disk IO is good and CPU usage is
very low.

Hardware Setup - The card is a 4 channel controller with 256Mb cache and the disk
cages have 2 channels per disk tray. The first 7 disks on channel 0, tray 0 are
configured as a 4 disk stripe for the OS and a 2 disk stripe containing the
rootdbs, physdbs and logdbs. Last disk is a hot spare. Channel 1, tray 0 is
configured as a 6 disk stripe with a hot spare split into lots of 15Gb logical
volumes for the data. All these stripes are then mirrored to tray 1.

The one thing I maybe didn't make clear in my original post is that the same
configuration (both IDS and OS) runs significantly quicker on the DS25. The DS25
only struggles to support the business during peak load; on a day to day basis it
is fine. Currently, the ES45 isn't even coping with a 20% of day to day loading (it
starts struggling with less than 50 users logged in as opposed to 300).

Regards


Simon Coyne





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