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11-24-2010 01:53 AM
11-24-2010 01:53 AM
Disk device path suddenly changed and telnet errors=hung system
Yesterday we had a customer machine 'hang' on a rx7620 running UX 11.23. (Single partition only. Boots from local disks and has two extra vg's sat on HP SAN).
Currently logged in users just froze, whilst new telnet connection attempts got an error about missing telnet device drivers (see note below from syslog).
After forcing a reboot via iLO, I noted that one of the vg's also failed to activate.
syslog revealed error regarding telnet was:
"Fatal error: Telnet device drivers missing: No such device." I've seen in other ITRC posts that this can relate to missing pty device entries - but that doesn't seem to be the case here (I did a count of them, then ran insfe -e, counted again and it was same).
As for the failed vg ... Ran ioscan -fnCdisk and saw paths to SAN attached volumes as being c14t0d0 and c14t0d2 (when this second one should be c14t0d1!).
I then did a vgexport of the old vg, created new vg and group entries and was then able to vgimport from the new c14t0d2 path and activate the vg. Quick edit of fstab and we were able to mount the lvol once again (we also had to run fsck on the volume before it would mount [to be expected given it was open/active at point of the hang]).
I can't see anything in syslog reporting disk/vg issues prior to the hang/reboot.
Customer has assured me no changes were made (and no errors reported) on the SAN side of things. FC interconnects and switches all in order too.
I have seen infrequent, similar problems before on other customers machines, where SAN and local disk device paths/names changed for no good reason, but we never got the bottom of those either!
Your thoughts/comments would be most welcomed!
Thanks,
Doris.
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11-24-2010 02:36 AM
11-24-2010 02:36 AM
Re: Disk device path suddenly changed and telnet errors=hung system
In my opinion, if it has changed the path from c14t0d2 to c14t0d1, it must have been for some change at the san level (probably some change in a port on the switchs).
I think the telnet error is due to disk problem.
Regards.
Noé
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11-24-2010 06:37 AM
11-24-2010 06:37 AM
Re: Disk device path suddenly changed and telnet errors=hung system
I've asked customer if they can check the logs on the switches.
Puzzled if it could be the switches though, as both paths go through same physical controller and switch connections. I would have expected any change in switch config/status to have changed the overall device instance number/paths and we would have lost both VG's?
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11-24-2010 06:44 AM
11-24-2010 06:44 AM
Re: Disk device path suddenly changed and telnet errors=hung system
Both paths go through same physical controller but each port of the physical controller have a different port in the switch. I think something happended in the switch port of the c4t0d1 disk.
Regards.
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11-24-2010 07:36 AM
11-24-2010 07:36 AM
Re: Disk device path suddenly changed and telnet errors=hung system
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11-24-2010 09:21 AM
11-24-2010 09:21 AM
Re: Disk device path suddenly changed and telnet errors=hung system
Customer has assured me there have been no changes on the SAN side of things. I've currently got them checking SAN switch logs for any events too.
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11-24-2010 04:42 PM
11-24-2010 04:42 PM
Re: Disk device path suddenly changed and telnet errors=hung system
Refer to page 13 of http://bizsupport2.austin.hp.com/bc/docs/support/SupportManual/c02019269/c02019269.pdf
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11-25-2010 07:57 PM
11-25-2010 07:57 PM
Re: Disk device path suddenly changed and telnet errors=hung system
Shibin
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11-26-2010 12:13 AM
11-26-2010 12:13 AM
Re: Disk device path suddenly changed and telnet errors=hung system
The d1 and d2 value represent the LUN number (e.g. LUN1 vs. LUN2); so this has NOTHING to do with switch ports, zoning etc ...
An array presents a LUN with a LUN number, this number has been changed and such changes are made by storage administrators (or maybe by misconfiguration).
It could be helpful to tell the array model, an ioscan -fn, etc ... just more details.
Hope this helps!
Regards
Torsten.
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11-26-2010 12:16 AM
11-26-2010 12:16 AM
Re: Disk device path suddenly changed and telnet errors=hung system
>> Customer has assured me no changes were made ...
... as expected. ;-)
Hope this helps!
Regards
Torsten.
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There are only 10 types of people in the world -
those who understand binary, and those who don't.
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No support by private messages. Please ask the forum!
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