topic Re: PV Timeout values in Operating System - HP-UX

PV Timeout values

Chad_7 — Tue, 06 Nov 2001 21:23:52 GMT

Hey Everyone

I need to know what the maximum timeout value used for oracle database

IE pvchange -t .......

My customer is getting lbolt errors and its currently set at 90

Re: PV Timeout values

Scott Van Kalken — Tue, 06 Nov 2001 21:27:42 GMT

From memory HP do not really reccommend changing it lower than 180.

Re: PV Timeout values

Michael Tully — Tue, 06 Nov 2001 21:31:08 GMT

Hi,

The default value is usually far too low, but increasing above 90 is quite okay, in fact up to 180 is fine particularly for Disk Storage Arrays, such XP 256, 512 EMC and autoraid. If you speak with HP, they will tell you 180 anyway.

HTH
-Michael

Re: PV Timeout values

A. Clay Stephenson — Tue, 06 Nov 2001 21:34:36 GMT

Hi Chad:

The answer is that it depends. For single disks the 60 or seconds is reasonable but for for arrays, I would go with 120 at a minimum and about 240 as a maximum. Somewhere in the 120-180 range is a rather value all around value for a disk array.

Regards, Clay

Re: PV Timeout values

Chad_7 — Tue, 06 Nov 2001 21:38:57 GMT

So a timeout value for Oracle can be greater than 120?

Re: PV Timeout values

Roger Baptiste — Tue, 06 Nov 2001 21:39:10 GMT

The setting of timeout value
is not related to database, but the disks being used.

For EMC disks here, i use
180 seconds, which should be a comfortable number to get a response from the disks.

You can set it to 180 and
observe.

Regarding lbolt errors,
pvtimeout is only part of the
story. If it is happening
often, you would need to
have a closer look at your
connections and disk subsystems. What disks are you using?

-raj

Re: PV Timeout values

Chad_7 — Tue, 06 Nov 2001 21:44:00 GMT

A500 connected to 2 external SMART drives.
Getting LBOLT erros when system is under heavy IO load. I have found several documents say not to got over 90 and some saying you can go up to 180. I need some clarification

Re: PV Timeout values

Patrick Wallek — Tue, 06 Nov 2001 21:54:58 GMT

I would personally set it at 180 and monitor and see what happens.

If you are getting really frequent errors, even after changing the value, call HP as there could potentially be a hardware problem.

Re: PV Timeout values

Sanjay_6 — Tue, 06 Nov 2001 22:08:15 GMT

Hi Chad,

Take a look at the threads below,

http://us-support.external.hp.com/cki/bin/doc.pl/sid=855d7a640c36f7f161/screen=ckiDisplayDocument?docId=200000048391490

http://us-support.external.hp.com/cki/bin/doc.pl/sid=855d7a640c36f7f161/screen=ckiDisplayDocument?docId=200000050088204

Hope this helps.

Regds
P.S. : You should not be required to increase the timeout value that high. Maybe a change of some other kernel parameter or even a disk might help.

Thanks