Re: Dell Equallogic

[Ray Van Dolson <rayvd@xxxxxxxxxxxx>]

On Wed, Oct 14, 2009 at 11:22:36AM -0700, nate wrote:
> John R Pierce wrote:
> 
> > if you have a SAN that supports logical volumes that have snapshot and
> > grow and such, I'm not sure why you'd bother with LVM on top of that, it
> > would just further obfuscate things.
> 
> Makes life easier for me when using MPIO, auto detection of the
> volume no matter what path it shows up with. And I can slap an
> easily readable "label" on the volume so I know what it is.

Couldn't you accomplish this with the "alias" parameter in your
multipath.conf file per LUN?  We have this set up here so there's a
/dev/mpath/<friendly_name> based on the WWID.

(Not that I have any problem with using LVM as you are...)

> 
> Sample log from one of my oracle snapshot procedures:
> http://portal.aphroland.org/~aphro/san/oracle-restore-prod-oracle-1a_20080319_230901.log
> 
> And it allows me to better control growth with thin provisioning,
> some apps are not thin provisioning friendly so I restrict them
> with LVM, knowing that I can easily do an online resize at any
> time without touching the array.

Definitely.

Ray
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