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Re: [dm-devel] Question about WWID



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
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Rodrigo Nascimento
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