Question about WWID

Question about WWID

[Rodrigo Nascimento]

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Hi All,

How the WWID from dm-mp is generated? I can image that it use serial number
of the disk, but how it is really generated?

Regards,

Nascimento
NetApp - Enjoy it!

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Re: Question about WWID

[Hannes Reinecke]

Rodrigo Nascimento wrote:
> Hi All,
> 
> How the WWID from dm-mp is generated? I can image that it use serial
> number of the disk, but how it is really generated?
> 
It is using the SCSI Inquiry VPD pages; page 0x83 or, failing that, path 0x80.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)

Re: Question about WWID

[Rodrigo Nascimento]

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Hi All,

Thanks Dr. Hannes Reinecke.

After read some docs, I found out this information about the WWID:

- Its origin is the VPD Pages;
- It's a NAA (Network Address Authority) identifier;
- As a NAA identifier it is unique because its format is:
      3 + 6(from NAA 6) + IEEE Company_id + Vendor Specific Identifier +
Vendor Specific Identifier Extension

+ == concatenated

Please, if it is not correct tell me.

Thanks and Regards,

Nascimento

On Mon, May 3, 2010 at 8:12 AM, Hannes Reinecke <hare@suse.de> wrote:

> Rodrigo Nascimento wrote:
> > Hi All,
> >
> > How the WWID from dm-mp is generated? I can image that it use serial
> > number of the disk, but how it is really generated?
> >
> It is using the SCSI Inquiry VPD pages; page 0x83 or, failing that, path
> 0x80.
>
> Cheers,
>
> Hannes
> --
> Dr. Hannes Reinecke                   zSeries & Storage
> hare@suse.de                          +49 911 74053 688
> SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
> GF: Markus Rex, HRB 16746 (AG Nürnberg)
>
> --
> dm-devel mailing list
> dm-devel@redhat.com
> https://www.redhat.com/mailman/listinfo/dm-devel
>



-- 
Rodrigo Nascimento
Storage System Engineer
(13) 8805-5892

http://stortech.wordpress.com

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