[dm-devel] Question regarding multipath WWID

[Lavannya]

Until  and unless i know   how the WWID is being generated , it is 

tough to relate what the document is describing. Also to identify the

shared  luns , I need to know more about WWID.

thanks



--- On Wed, 6/10/09, Chandra Seetharaman <sekharan at us.ibm.com> wrote:

> From: Chandra Seetharaman <sekharan at us.ibm.com>
> Subject: Re: [dm-devel] Question regarding multipath WWID
> To: "device-mapper development" <dm-devel at redhat.com>
> Date: Wednesday, June 10, 2009, 3:54 PM
> What is your purpose for needing to
> know how WWID is generated ?
> 
> Do you want to identify and name them the same in both the
> nodes ?
> 
> On Wed, 2009-06-10 at 12:01 -0700, Lavannya wrote:
> > Hi,
> > 
> > Recently  I am trying to test few  luns with
> multipath , in two of my
> > 
> > test server.  I worked throughly with PowerPath.
> 
> > 
> > I have few questions on multipath:
> > 
> >     -  what is the logic
> redhat is using  to create the WWID
> >        and what are the fields
> involved
> > 
> >     -  I am trying to test
> with the shared luns  (devices) between
> >        two nodes.  How i will
> identify  the device id in multipath.
> >        Though  as per Redhat
> ,  they are telling WWID is the identifier.
> >        But how i will identify the
> device id in the WWID?
> >        It is very much needed
> specially for shared luns.  In PowerPath, 
> >        generally  all the
> devices  are  identified  by the 
> >        lun id  /device
> id  then ,
> >        I use the Pseudo name
> (linux), for configuring the devices.  I will
> >        assume  that WWID is
> similar  as Pseudoid. If not, pl. correct me.
> > 
> >     -  Where can i match the
> device id in the WWID..
> > 
> > It will be really appreciated  , if someone
> clears  all my questions.
> > 
> > Thanks in advance.
> >     
> > 
> >     
> > 
> > 
> >       
> > 
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