EMC Power Path for RH EL 5.2

[Allen, Jack]

Kris:
	I really do not want to have to downgrade the OS. Unless there
was some change in the kernel API calls Power Path uses, it really
should not matter because the basic kernel version would be the same.
Yes there would be point versions.

	The Power Path driver is a kernel loadable module. When the
kernel does change, then there is a directory that has to be created in
the new kernel tree and rpm run again with the --replacepkgs option to
reinstall the modules. I had to do that several times for RH AS 4.X.

	Another reason is because we compile our Application on the
systems and expect our customer to keep their system up to date. It
really makes it very complex to tell them to upgrade everything but the
kernel until you hear different. Then for all I know there could be
several kernel upgrades say from 5.1 to 5.4 and the driver is only
supported up to 5.2 or will be. Myself and our customers can not easily
if at all select the one to upgrade to. The latest one is the only one
shown by yum.

Thanks:
Jack Allen


-----Original Message-----
From: Kristoffer Knigga [mailto:Kknigga at arrow-financial.com] 
Sent: Wednesday, June 18, 2008 5:52 PM
To: General Red Hat Linux discussion list
Subject: RE: EMC Power Path for RH EL 5.2

I've had similar problems.  I think the issue is that the kernel module
is compiled by EMC for specific kernels, not dynamically on
installation.  The reason I got was to ease the support load for EMC.

I really, really like PowerPath and will do what I need to do to run it,
even if that means running a slightly older RHEL release.

Kris Knigga



-----Original Message-----
From: redhat-list-bounces at redhat.com
[mailto:redhat-list-bounces at redhat.com] On Behalf Of Allen, Jack
Sent: Wednesday, June 18, 2008 4:38 PM
To: General Red Hat Linux discussion list
Subject: EMC Power Path for RH EL 5.2

Hello:
        I have run into a little bit of a problem dealing with EMC Power
Path. I know, your first thought is, so why are you asking this list
about it and not EMC? I have asked EMC indirectly (see below) and did
not really like their answer.

        I have some new systems that I installed RH EL 5.1 on with the
assumption that EMC Power Path would be supported on it. And I think it
was, is. I have Power Path install on some other systems running RH AS
4.6. Because the SAN is from EMC is the reason our SAN group wanted me
to use Power Path.

        While waiting for our SAN group to allocate disk space and cable
up the systems I have been keeping the system up to date via yum. Along
the way the kernel version has changed and the over all system is now RH
EL 5.2. So when the SAN group told me the SAN was all connected and I
needed to install EMC Power Path is when it was identified there is a
problem. It will not install.

        When rpm is run with the latest file from EMC I get an error
stating the software is for RHEL5. That's correct, just RHEL5, no dot
anything. I had our SAN group contact EMC and the response back from EMC
was RH EL 5.2 will not be supported until the 4 QT of this year.

        So my first question is has anyone else run into this problem?

        If so what did you do?

        I know I can probably use the Multi Path software that comes
with Linux, but I would like to keep all my systems configured as mush
the same a possible. This just makes dealing with the SAN group a lot
easier.

Thanks:
Jack Allen

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