Storage space partition

[Bob McClure Jr]

On Fri, Apr 14, 2006 at 04:35:38PM -0400, Allen, Jack wrote:
> 
> 
> 	When using a SAN and there are multiple paths to it, you will see
> multiple sdX entries for the true storage. This means you could access
> /dev/sda and see the exact same things if you access /dev/sdb as an example
> if the SAN had been configure to allow access to 1 LUN. With EMC's
> Navisphere and PowerPath installed, there will also be a /dev/emcpowera.
> This is what you want to either partition and or make the whole things a
> Physical Volume in LVM. When you run the pvcreate command, or many of the
> other LVM related command it scans the /dev directory and reads each block
> device it find to see if it is part of a Volume Group and/or can be used by
> LVM. This is why you are getting the duplicate messages and the message
> about the cdrom.
> 
> 	To keep this from happening you have to edit /etc/lvm/lvm.conf.
> There are some pretty good comments that explains things. The main idea is
> to exclude the /dev/sd* and /dev/cdrom names and only use the /dev/emcpower*
> names.

Why would you prefer to use /dev/emcpower* rather than /dev/sd*?
Seems the latter would yield fewer surprises, even if it's exactly
equivalent.  Just curious.

> 	This is a little brief in the scheme of things, but I hope it helps.
> I can try to give more detail if needed.
> 
> Talk 2 U later.
> Jack Allen

Cheers,
-- 
Bob McClure, Jr.             Bobcat Open Systems, Inc.
bob at bobcatos.com             http://www.bobcatos.com
The best things in life aren't things.