topic Re: Diagnosing a missing path to PGB in Operating System - OpenVMS

Diagnosing a missing path to PGB

Carl Karcher — Fri, 16 Jul 2004 15:12:50 GMT

Cluster, ES40, VMS 7.3-2, two KGPSA's attached to EVA-5000 via sanswitch 2/8 el (port zoned).

On an ES40 node $1$dga devices only have paths to PGA. On ES47 paths to both PGA and PGB are present. SHOW DEV FG/FULL displays WWID's on both controllers and no errors. Port lights are green (activity light flashing too) on both controllers and on switch. A SET PATH=PGB/ENABLE results in:

-SYSTEM-E-NOSUCHPATH, specified path does not exist

I suppose this could still be a hardware issue but are there any other online tests I can make before swaping the KGPSA? Zoning comes to mind but that looks correct and I can see both controllers from the switches.

Re: Diagnosing a missing path to PGB

Uwe Zessin — Sat, 17 Jul 2004 00:02:26 GMT

Carl,
I don't remember what the output of 'SHOW DEVICE FG/FULL' looks like, but I don't think it shows any controller or LUN WWNs. Have you checked on the EVA if the port WWN of ES40's PGB0 is assigned to the host entry?

Re: Diagnosing a missing path to PGB

Amit Levin_2 — Sat, 17 Jul 2004 05:28:38 GMT

Hi Carl, I would check for switch zoning setings, EVA - host accessing to the virtual device and then for firmware version of the hba that does not see the path (this could be a secure-path issue).

Re: Diagnosing a missing path to PGB

Hein van den Heuvel — Sat, 17 Jul 2004 10:21:07 GMT

What about the picture from the EVA side?
When you created the host definitions there, did you see both WWIDs, one for each KGPSA?
Where those two wwids bnched into one host, or to two individually labeled hosts? In the latter case, was the Virtual Disk in question present both hosts?

Hein.

Re: Diagnosing a missing path to PGB

Uwe Zessin — Sat, 17 Jul 2004 10:43:22 GMT

Amit,
OpenVMS does not use Secure Path - it has multipathing embedded.

Re: Diagnosing a missing path to PGB

Carl Karcher — Sun, 18 Jul 2004 21:52:04 GMT

Thanks to Uwe and Hein problem solved!

It was on the EVA side. I had in the back of my head that one of the KGPSA's was swapped out a few months back but didn't remember the EVA needs to know that (I last did that as part of the EVA "class" well over a year ago). I added the new host port on the EVA side, did SYSMAN IO AUTO and the PGB path was back.

Thanks a bunch!