IPL - Rebooting the AS/400

[rahulyell]

Hi,

We have a AS/400 which was performing very badly for last month or so.

In order to perform several functionalities we have Island Pacific(Merchandising Package) Installed in our system. It has been running well for last couple of years.

The system was almost busy in a day and crucial processes such as Sales Processing,PLU processing,Warehouse processing,EYE datamart processing etc were running everyday.

But in last month the performance has come down and system response time was very bad. For eg if we type WRKMBRPDM on the command line then it used take more than a minute for the command to be executed.

So they have done an IPL(Intial Program Load)/Rebooting the system. Now the performance is good.

I would like to know how does an IPL change the system performance.

Could somebody throw light on system performance in regard to number of processes executing, memory dependency, no of interactive sesssion open, etc

Thanks in advance.

Regards,
Rahul

[jamief]

Re: IPL - Rebooting the AS/400

Your asking a big question with almost no data.
Are there jobs running? and when you IPL are you just doing an PWRDWNSYS *immed .......and killing these jobs?

when things get slow:
I would first look at wrkactjob (change your job to JOBPTY(9) ) then place cursor on the %cpu being used and hit F(16) see if there is a job looping.


then get back to us..........

[arrow483]

Re: IPL - Rebooting the AS/400

There are a number of things that get cleaned up at IPL time. Temporary addresses, temporary objects, and caches are some. Although the iSeries is famous for being able to run a long time, I always suggest running an IPL at least monthly, and even weekly if possible. This may become more important with V5R4 with the new MTI (Maintained Temporary Indexes) being created by SQL and the SQL cache plan.

[ChrisSDC]

Re: IPL - Rebooting the AS/400

Kind of funny how IBM is always saying that they are moving away from IPLing.


Chris

[Arsenal4ever]

Re: IPL - Rebooting the AS/400

HI,
Can u tell me the command to be executed to do IPL.I think its IPLDATTIM,iam not sure.Tell me the parameters listed when this comamnd is executed.How much does it take for the system to reboot.

[DeadManWalks]

Re: IPL - Rebooting the AS/400

hi, the command is PwrDwnSys.
IBM info...http://publib.boulder.ibm.com/infoce.../pwrdwnsys.htm

How long it takes depends on the size of your system, your CPW, the number of sub systems you run and on and on. we have a 810 and it takes about 15 minutes with no one on to shutdown and come back up.