HW paths

[Alan Garner]

Scenario: 2 HP-UX v2 rx2600 servers attached via 2 single port fibre cards to an eva 5000 san.

These servers will be in an Oracle RAC and therfore have to have the same device files for each lun (or so I have been told).

Originally server1 had an extra lun presented to it before we presented the other luns to both servers. Because of that (I presume) all of the HW paths are off by 1. I tried removing the extra lun but that did not affect the device files or hw paths. I then tried rmsf -a /dev/rdsk/c2* (to ../../c7*) to remove all of the device files after removeing the extra lun...but again no effect. I even tried disconnecting the fibre cables (and then ioscan) thinking that would reset hw paths.

My necessity is to get both servers with the same device file names and HW paths. What is the best way to accomplish this? I am I missing something? Would removing all the luns and re-presenting then in the same order to each server do the trick?

Thanks to all!

Alan

[Hasan Atasoy · Accepted solution]

hi alan ;

the easiest way is remove all luns from a server and present the luns in the same order of other server. since hw patch are dependent to lun numbers. if lun numbers are same at eva side your device address will be same on server. ( at least txdz parts , card instances may differ )


hasan

[Eric SAUBIGNAC]

Hi Alan,

Not sure that you need to have same special files names with Oracle RAC : far too many constraints.

Anyway if you need to modify special file names of disks, follow the procedure at http://www11.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c00904872-5

It is rather old but works pretty well : I did it frequently.

Hope this help

Eric