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Full Discussion: IO queue maxtime over 1 minute
Operating Systems AIX IO queue maxtime over 1 minute Post 303010680 by Peasant on Friday 5th of January 2018 07:39:05 AM
Old 01-05-2018
Not an AIX export but you could try to...

1. Failover a path to working path only (is possible dunno in aix, probably is).
2. Change the cable for faulty path.

I've debuged HPUX boxes with 'bad' cables experiencing exactly the same issues, long IO waits.

As i failed over to healthy path via scsimgr the machine got back to life.
Initially, the boot time was 20/30 minutes, dropped to normal after path switch.
This was VPAR on FC disk.

At the end i went to system room, pulled the 20 M fibre cable across data center to replace/diagnose the faulty cable.
Everything worked well, so the bad cable was replaced properly afterward.

Probably a factory error or someone damaged the cable during installation.

Of course, check the storage side and FC port switch to which the server is connected.

Hope that helps
Regards
Peasant.
 

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LEARN ABOUT POSIX

liebert

LIEBERT(8)							    NUT Manual								LIEBERT(8)

NAME

       liebert - Driver for Liebert contact-closure UPS equipment

NOTE

       This man page only documents the hardware-specific features of the liebert driver. For information about the core driver, see nutupsdrv(8).

SUPPORTED HARDWARE

       This driver supports some Liebert UPS equipment with a contact-closure interface. This includes the UPStation GXT2 with their
       contact-closure cable. The smart mode ("Multilink") cable is not supported by this driver.

EXTRA ARGUMENTS

       This driver does not support any extra settings in the ups.conf(5).

BUGS

       This driver does not yet support shutdowns by raising DTR. Be aware that shutdowns are not possible with the stock contact-closure cable.
       You may have to build another cable with DTR connected through to the UPS for it to work.

       There is no way for this driver to detect the hardware or cable. It will start up successfully even if no UPS is present. This is a
       fundamental limitation of any contact-closure driver.

SEE ALSO

   The core driver:
       nutupsdrv(8)

   Internet resources:
       The NUT (Network UPS Tools) home page: http://www.networkupstools.org/

Network UPS Tools						    05/21/2012								LIEBERT(8)
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