How to find secondary link to a disk

[frederick hannah]

What is the best way to find the secondary path to a disk? I have only a primary link to c108t5d3: 0/4/0/0.32.0.8.1.5.3. My "guess" as to the secondary or alternate path to the above disk is C111t5d3: 1/10/0/0.33.0.9.0.5.3. If this isnt right,I need instructions on how to match disks with their alternate paths

[sujit kumar singh · Accepted solution]

have you multopathing software installed, what is the OS version you are using?


if 11.31 then ioscan -m hwpath can help you,
evainfo powermt can help you if you the tools installed as per the Storage that you mighht be using

[frederick hannah]

HPUX 11.11 and our environment does support and features dual pvlinks to disk

[Modris Bremze]

Target and LUN numbers (the last 2) for both disks are the same, so I'd say that you have guessed right about them being alternate paths for the same disk.

http://docs.hp.com/en/AB378-96001/ch01s12.html might also help.

[James R. Ferguson]

Hi Frederick:

One way to confirm is to examine the PVID (Physical Volume ID) written when a physical disk is 'pvcreate'd for use with LVM. Equal PVID's mean that the devices are the same.

# xd -An -j8200 -N16 -tx /dev/rdsk/cXtYdZ | xargs

Regards!

...JRF...

[Modris Bremze]

James's method should be more definitive, because, if you have disks attached from multiple arrays, targets and LUNs could be of equal value for disks from different arrays.

[frederick hannah]

James hit the nail on the head. Thanks everybody for your help. My issue is resolved

[NouZ]

If system is V3 you can use
# ioscan -m dsf

This will list all disks with all path , So u can find out your specific disk details.

Or you can use additional product like
Symantec :DMP
HP :Secure Path
Emc :Power path
To find out and configure alternate path