[dm-devel] Question regarding multipath WWID

[Chandra Seetharaman]

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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