Re: p630 hangup

• Previous message: faisalq . (faisalq): "p630 hangup"
• Maybe in reply to: faisalq . (faisalq): "p630 hangup"
• Next in thread: BRUCE HARVEY: "Re: p630 hangup"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

Date:         Fri, 2 Sep 2005 13:20:20 +0200
To: aix-l@Princeton.EDU

It can be difficult to deal with this sort of problem. Usually a reset is
the quickest way to sort things out but of course that doesn't help you
prevent it happening in future.

If it's a memory leak, there are some IBM tools to help diagnose them. Got
to https://techsupport.services.ibm.com/server/aix.srchBroker and search for
"memory leak".

Sometimes, if you're patient you can eventually access a hung system. It
may take a long time and it will be slow but it's worth a try.

Running some simple monitoring in the background may be useful; just a
snapshot of processes taken periodically may help you identify the culprit.
If you can narrow down the time at which the problem occurs you could stick
in some more intrusive monitoring.

A bit more effort but potentially very useful would be to implement Workload
Manager. With this you should be able to put a hard limit on CPU and Memory
resources - say at 80% - which shouldn't affect normal work too badly but
would leave enough resource for you to log in when the problem occurs.

You could try having a background task monitoring CPU use, and killing
anything that hits a chosen threshold, (presumably with some additional
conditions so that you don't cripple your system!), or renice it to drop its
priority way down.

-- 
Simon Green							
Altria ITSC Europe s.a.r.l.
AIX-L Archive at https://new-lists.princeton.edu/listserv/aix-l.html
New to AIX? http://publib-b.boulder.ibm.com/redbooks.nsf/portals/UNIX
N.B. Unsolicited email from vendors will not be appreciated.
Please post all follow-ups to the list.
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
faisalq . (faisalq)
Sent: 02 September 2005 11:59
To: aix-l@Princeton.EDU
Subject: p630 hangup
Hi,
On our p630 system (AIX 5.2 ML01), we are facing lockouts. Sometimes in the
morning nobody can access the system neither thru telnet nor Oracle session.
System is practically locked out and there is no option other than hard
reset. It looks to be related to a runaway oracle process.
Is there a way we can investigate the issue at that time and access to kill
the runaway process?

• Previous message: faisalq . (faisalq): "p630 hangup"
• Maybe in reply to: faisalq . (faisalq): "p630 hangup"
• Next in thread: BRUCE HARVEY: "Re: p630 hangup"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]