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

ioscan hung

Sarjerao — Thu, 02 Jun 2005 22:42:12 GMT

ioscan -fun shows some devices scan state, which I physically dosconnected, But when I run ioscan -fn it get hung (not server). Even I unable to kill ioscan process, when killed ppid becomes 1. All ioscan process shown in process list. Is there any solution to kill hung process and ioscan work normally.

Re: ioscan hung

Joseph Loo — Thu, 02 Jun 2005 22:49:02 GMT

hi,

unless u know what r the devices causing this problem (which u may unplug if they r hot-pluggable), u may have to do a reboot.

regards.

Re: ioscan hung

Sarjerao — Thu, 02 Jun 2005 23:16:42 GMT

as this is production system reboot not possible.
the devices showing scan stae are dvd and ultrium drive whcih I unplugged, but still gives problem. enven if I run ioscan for other class e.g. lan that also get hung.

Re: ioscan hung

Muthukumar_5 — Fri, 03 Jun 2005 00:58:14 GMT

Which platform you are facing this problem.?

Any process with PPID of 1 can be killed upon reboot only. Sometimes there may be chance to get some other PPID and after some time it will be killed normally.

You have to use ioscan -M format when some devices physically disconneted. Read ioscan man page.

hth.

Re: ioscan hung

Sarjerao — Fri, 03 Jun 2005 01:16:31 GMT

B.11.11 U 9000/800;
ioscan -M forcibly bind the driver, but I unplugged devices which shows scan state.
(dvd and ultrium drive)

Re: ioscan hung

Muthukumar_5 — Fri, 03 Jun 2005 01:42:40 GMT

How did you try to stop that ioscan -fn? Using ctrl+c ?
Did you try with root / non-root user?

hth.

Re: ioscan hung

Nguyen Anh Tien — Fri, 03 Jun 2005 01:53:52 GMT

If you have just add VA or EVA storage to you SAN. Remember to patch all required patches.
Last time I add EVA3K to my SAN, my staff forget to add one patch (securepath patch) so Server was hung whenever i issue ioscan command

Re: ioscan hung

Sarjerao — Fri, 03 Jun 2005 04:19:13 GMT

ctrl-c doesn't works. session only needs to abort.
RA8k storage is connected to the system.
Is there any way to kill hung ioscan process.

Re: ioscan hung

Bharat Katkar — Fri, 03 Jun 2005 08:03:22 GMT

HI Sarjerao,
IOSCAN process cannot be interruped.
It will keep on searching devices and may be it is going in loop.
If possible try switching OFF and then ON external storage device (if possible).

Regards,

Re: ioscan hung

Steven E. Protter — Fri, 03 Jun 2005 08:34:50 GMT

All systems eventually require reboot.

You have a hardware problem, which probably can't be fixed without downing the machine. Its time to think about scheduling a maintenance window.

SEP

Re: ioscan hung

Patrick Wallek — Fri, 03 Jun 2005 08:45:23 GMT

The ioscan process is most likely hung because it is waiting on an I/O operation to some device to finish. Until it finishes, nothing is going to happen. You can not kill a process in this state.

If ioscan ever gets the response it expects, then your ioscan will proceed, otherwise it will just sit there forever.

Re: ioscan hung

RAC_1 — Fri, 03 Jun 2005 09:06:15 GMT

Do not do anything. As others told you those devices were disconnected by you and ioscan is trying to scan them.

Only reboot will clear up the things. Till then, if you want to look at certain io devices, restrict the ioscan to certain class devices.

ioscan -fnCext_bus
ioscan -fnClan

Anil

Re: ioscan hung

Duncan Edmonstone — Fri, 03 Jun 2005 09:14:59 GMT

So you broke a SCSI bus, and you're wondering why a bus scan hangs?

These devices are not OLAR!

A reboot is the only way to resolve this now - of course if the rest of your server is working fine, then just leave it until you can arrange some downtime - but don't be surprised if you have more problems when hardware diagnostics check the status of your system...

HTH

Duncan

Re: ioscan hung

Sarjerao — Mon, 06 Jun 2005 00:57:00 GMT

Hi
Thnaks to all
Finally reboot only solved the problem.