topic Re: Finding alternate path in Operating System - HP-UX

Finding alternate path

Ed Kwan_2 — Mon, 28 Apr 2003 17:31:05 GMT

Is there any other way to find the alternate path to a disk other than using vgdisplay -v, which shows all the alternate paths of a disk.

How does vgdisplay do it ?

Thanks, Ed

Re: Finding alternate path

Geoff Wild — Mon, 28 Apr 2003 17:45:00 GMT

Not really....if your stoarge is on EMC, then you can also see the disks with syminq....what do you need to do exactly that vgdisplay doesn't work for you?

Rgds...Geoff

Re: Finding alternate path

Ed Kwan_2 — Mon, 28 Apr 2003 17:49:38 GMT

I am trying to write a script to determine my alternate path is correct via the hardware path. From the device file, I can use ioscan to find the hw path which will allow me to determine the domain of the switch.

Re: Finding alternate path

Uday_S_Ankolekar — Mon, 28 Apr 2003 17:57:55 GMT

Look for Terry's response in this thread.

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xa2aae7613948d5118fef0090279cd0f9,00.html

-USA..

Re: Finding alternate path

John Waller — Mon, 28 Apr 2003 17:59:52 GMT

An expert may correct me on this one, but I thought the vgdisplay command command picked up the information from the vgda on the disk. When you vgextend a disk into a volume group I presume the information about that vg is recorded in the first block on the disk . (Why else do you have to pvcreate -f to re-use a disk which has been used on another system). If you the vgextend to that disk again using an alternate device (path) it automatically recognizes that it is part of that vg, so you get the alternate link. I may be wrong but it sound reasonable.

Re: Finding alternate path

Ed Kwan_2 — Mon, 28 Apr 2003 18:44:14 GMT

Thank you all for the suggestions. From previous postings, all were under the assumption I already know both paths and try to verify it is indeed correct.

However, in my scenerio, given one disk, I would like to find its alternate path without knowing the c?t?d?.

I can parse out the info from vgdisplay or pvdisplay, I thought there might be a more arrogant way to do that.

Thanks, Ed