topic Re: slow ioscan in Operating System - HP-UX

slow ioscan

avik — Sun, 05 Nov 2006 09:22:16 GMT

I have two rx1625 boxes to be configured in MC/SG cluster, connected to an MSA1000 connected thro' a brocade switch. The OS is hpux 11.23 with Sep. 2006 patches. I have a proper zoning configuration in brocade. The problem is, the ioscan output takes about 5 minutes to publish the details. thanks for the help in advance.

Re: slow ioscan

Steven E. Protter — Sun, 05 Nov 2006 10:31:13 GMT

Shalom,

Just this very day we had the same problem.

In our case it was corrected with the following actions:
Changing the LUN type on the array from Linux to HP-UX
Brining the firmware on the EVA in our case up the latest version.

SEP

Re: slow ioscan

avik — Sun, 05 Nov 2006 12:51:05 GMT

here the profile is already set to HP.

Re: slow ioscan

Peter Nikitka — Sun, 05 Nov 2006 14:01:15 GMT

Hi,

there is a product called 'multithreaded ioscan' MtIOscan11i available from HP:

>>
This product contains kernel support features for multi-threaded ioscan capability. The product provides this support by enabling multi-threading in the boot stage, much before IO discovery.This allows the system to perform the device discovery operation in a parallel fashion. This reduces the amount of time spent in device discovery and hence results in a significant improvement in the system boot time. The boot time improvement is significant in the systems with large device configurations where a considerable fraction of boot is spent in device discovery.

Additional product information
Product #: MtIOscan11i
Version: B.11.11.01
Software specification: HP-UX 11i version 1 for Workstations and Servers
<<

You'll have to look, if something like that is available for 11.23 as well.

mfG Peter

Re: slow ioscan

avik — Sun, 05 Nov 2006 17:52:58 GMT

thank you peter but am talking a problem thats after the machine has booted up. Also am able to create the filesystems etc without any problem.

Re: slow ioscan

Alzhy — Mon, 06 Nov 2006 09:13:02 GMT

Avik, check very carefully that you have the patch(es) for the slow ioscan problems. There are versions for 11.0, 11.11 and 11.23.

Scan the Patch database carefully...

BTW, how many MSA1000 LUNS do you have all in all.?

Re: slow ioscan

avik — Mon, 06 Nov 2006 10:19:29 GMT

yep, i was thinking to do a patch assessment

I have 4 luns locally presented to both the nodes and 5 luns as shared raw devices.

Re: slow ioscan

Alzhy — Mon, 06 Nov 2006 10:51:13 GMT

Check:

PHKL_33827:
http://www2.itrc.hp.com/service/patch/patchDetail.do?patchid=PHKL_33827&sel={hpux:11.23,}&BC=main|search|

PHCO_34720:
http://www2.itrc.hp.com/service/patch/patchDetail.do?patchid=PHCO_34720&sel={hpux:11.23,}&BC=main|search|

HTH..

Re: slow ioscan

Anh.Quan — Mon, 20 Aug 2007 05:46:20 GMT

Hello All,

now i am facing the same problem, ioscan so slow, my system include (MSA1000, rx3600, FC)

I applied patches (PHKL_33827, PHCO_34720) follow guide of Nelson but. it couldn't fix problem. Pls advise!