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How to determine the actual path/PVLink in use at a given moment....

 
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grahamswilson
Trusted Contributor

How to determine the actual path/PVLink in use at a given moment....

I have an old 11iv1 server, with a VG made up of a bunch of disks, each with 4 paths - which are correctly showing in the VG as 1 defined primary path and 3 alternate "pvlinks".

 

Silly question, but if the primary were to fail and I/O was then to move to the first alternate link then (apart from looking in log files) how could I determine which one of the actual paths was actually in use at any given time?

 

I dont think the output of vgdisplay changes if a primary path were to fail over (i.e. vgdisplay still shows the primary path first and then alternate links)...what I'm looking for is a "what pvlink is *currently* in use" command!

 

Any input welcome...

 

 

 

 

2 REPLIES 2
Torsten.
Acclaimed Contributor

Re: How to determine the actual path/PVLink in use at a given moment....

The vgdisplay commend shows you the order of path, the first alternate will be used if the primary fails. You will find a related message in syslog about a failed path, the device will be shown as unavailable in vgdisplay.

 


Hope this helps!
Regards
Torsten.

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grahamswilson
Trusted Contributor
Solution

Re: How to determine the actual path/PVLink in use at a given moment....

Great, thanks - I knew about syslog, but didn't realize that vgdisplay would in fact show you which path had failed...