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GETDVI on VMS for multipath device - is path available?
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08-05-2009 09:29 AM
08-05-2009 09:29 AM
GETDVI on VMS for multipath device - is path available?
GETDVI on VMS for multipath device - is path available?
We have a VMS system that had several LUNs served to it by the backend eva, but, when we take down the eva or un-cable the paths I can't figure out how to tell from the operating system. You can tell if a mounted volume went away and that all paths are down but not if a single path or multiple paths are down as long as the volume is accessible.
I tried GETDVI PATH_AVAILABLE and PATH_NOT_RESPONDING but they never change states (PATH_AVAILABLE is always TRUE and PATH_NOT_RESPONDING is always FALSE) like the operating system never tests the paths to see if they are still alive at all once they have been configured. I also tried looking for anything in the device data structures in SDA and can't figure out anything.
Does anyone have a recommendation on how to test a path to see if it is still available and working?
I am willing to go through any number of steps to determine is a path is available or now.
Thanks,
Russ
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08-05-2009 12:25 PM
08-05-2009 12:25 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
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08-05-2009 12:36 PM
08-05-2009 12:36 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
Vms006$ set device /path=FGB0.5001-4380-2A56-F28A/poll $1$dga500
Vms006$ write sys$output f$getdvi("$1$dga500","PATH_POLL_ENABLED","FGB0.5001-438
0-2A56-F28A")
TRUE
Vms006$ write sys$output f$getdvi("$1$dga500","PATH_AVAILABLE","FGB0.5001-4380-2
A56-F28A")
TRUE
Vms006$ write sys$output f$getdvi("$1$dga500","PATH_NOT_RESPONDING","FGB0.5001-4
380-2A56-F28A")
FALSE
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08-05-2009 12:56 PM
08-05-2009 12:56 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
BTW: I did find a customer that has multipath devices, but they have V7.2-1 and that version did not have full multipath support.
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08-05-2009 01:05 PM
08-05-2009 01:05 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
As long as ANY LUN on a path responds, the path is considered to be good. The multipath poller does probe each path once a minute (or every 30 seconds if a path is bad). However, this is not a device-specific check, and I admit that displaying the status on a per-device basis (as in $ SHOW DEVICE /FULL) is a bit confusing.
What problem are you trying to solve? If a path goes bad, multipath will find a working path, if one exists. Preemptively trying to do multipath's job is likely to be met with confusion, as you are seeing.
-- Rob (who worked on multipath, and did all the multipath-related work to $GETDVI).
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08-05-2009 01:08 PM
08-05-2009 01:08 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
Vms006$ show device/multi $1$dga500
Device Device Error Current
Name Status Count Paths path
$1$DGA500: (VMS006) Online 0 9/ 9 FGB0.5001-4380-2A56-F288
The san will be back up Friday and I was going to see what I could find then. Thanks for your help!
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08-05-2009 01:51 PM
08-05-2009 01:51 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
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08-05-2009 01:55 PM
08-05-2009 01:55 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
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08-05-2009 07:56 PM
08-05-2009 07:56 PM
Re: GETDVI on VMS for multipath device - is path available?
Re: GETDVI on VMS for multipath device - is path available?
--
I'm not familiar with CAST; are you a contractor for HP? If so, contact me at
rab (at) hp dot com
-- Rob
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