Re: [linux-lvm] LVM with Powerpath - incompatibility

[Chris Osicki <osk admin swisscom-mobile ch>]

Hi Hantzley

You should read PowerPath Release Notes (P/N 300-001-969) or at least it's page 15 ;-)
"EMC pseudeo devices are not supported with LVM. Instead, native SCSI devices must be used..."

I think EMC messed up with device names as seeen in /proc/devices under "Block devices" and
LVM doesn't recognize them. They used to be called emcpower in older versions of PP I think,
now they are "emcp".

Regards,
Chris


On Fri, 27 May 2005 11:11:40 +0400
Hantzley Tauckoor <hantzley telecomplus net> wrote:

> Hi,
> 
> I have a CX300 Clariion and a x445 IBM (4 processors and 4GB RAM) server 
> equipped with 2 Emulex FibreChannel cards which are directly connected 
> to the cx300's controllers.
> 
> My software config is as follows:
> 
> Redhat ES 3.0 with Kernel 2.4.21-20.ELsmp
> PowerPath 4.3.1
> LPFC 2.4 driver kit 7.2.4-1
> lvm-1.0.3-15
> 
> 
> I created 2LUNs on the cx300, and therefore I can see 4 sd devices on 
> linux (2 on one path and 2 on the other). After installing PowerPath, I 
> am able to access the LUNs via /dev/emcpowera1 and /dev/emcpowerb1 
> respectively.
> 
> But I cannot use LVM on these devices directly. However LVM works with 
> /dev/sd* devices. I wish to use it with the PowerPath devices instead, 
> so as to have dynamic multipathing.
> 
> I also tried to install Veritas Volume Manager; no luck, the eval 
> version was compiled for kernel.2.4.xx-Hugemem - which is not my present 
> kernel. I have incompatibility problems because PowerPath 4.3.1 requires 
> at kernel 2.4.21-15 or 2.4.21-20.
> 
> Is there someone who had the same type of problem? Any tip on how to 
> make LVM run with PowerPath devices?
> 
> Thank you in advance for your replies.
> 
> Rgds,
> 
> Hantzley Tauckoor
> ----------------------------------------------------
> Project Manager
> Telecom Plus Ltd
> www.telecomplus.net
> ----------------------------------------------------
> 
> 
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