Dynamox maybe I have something for your RAC clusters ... please have a look at emc94701 ... Maybe it can help to some degree..

I did see this article, but this is basically just a different way of working around the problem instead of using that emcpadm tool which gives you a more direct way to rename devices. Looks like that emcpadm utility was only introduced in later version of PowerPath 4.x.

I'm looking more for ways to get more consistent results without having to juggle around the configuration file.

... and something also for you, Bodnarg ..

Have a look at emc112571 that talks about Clariion but tells the truth about emcpower devices

This is aimed mostly at clustering, but also been a problem with some software updates. Meaning LUN 0 presented will translate into emcpowerA, while LUN 1 will translate into emcpowerB, etc.

On upgrades have had cases were going from version say 4.x to 5.x a device that was emcpowerA is now emcpowerC because (I'm speculating) the rules changed.

when you say LUN/Target ordering ..what do you mean ? emcpowerX name to lun number translation ?

i see. We had the same issue with our RAC servers, system admins had to manually rename them back to what they were before the upgrade, they were not too happy but then we don't upgrade PP too often ..sorry don't have any tips for ya.

Bonardg if I understand what the primus said, it's impossible by design.

PowerPath numbers its pseudo's based on first availability or in other words as the O/S has built the device tree based on device creation of the native devices. It is not based on the Host LUN presentation of the storage groups.

it explains how to remedy the situation ..not a permanent fix. I have seen this behavior on a brand new installation.

You can find it in the primus .. it's something that happens on Linux and -maybe- Solaris. No other platform.

Hmmm I don't really think that Linus is still in Finland ..

As per www.cs.helsinki.fi/u/torvalds/ it looks like he is in Santa Clara .. not that far from Chicago

But let me know if I have to ask my manager to set up a meeting with Linus and -hopefully- you

Maybe I can convert some of the points earned in the forums .. and pay me the flight

Please have a look at the other primus ... they both explain (even if with different with a different accent) that each and every host will give its own name to the devices ... and that it's up to you to work around the "issue" and have the same names on both hosts ..

good article, but in my case PP was not skipping names, they would simply show up in different order from RAC node to another node. Not a big deal to rename them ..but sure is annoying.

i don't see this happening on AIX nor Windows ...must a Linux thing.

Both primus explain how to have the same names on both nodes if I understood what the primus said

common Stefano ..don't give me excuses ..fix the issue man ..get with Linus, he is geographically closer to you then he is to us