Re: [nfsv4] FW: New Version Notification for draft-faibish-nfsv4-pnfs-block-disk-protection-01.txt

[Jason Glasgow <[e-mail]>]

As suggested, the GPT is also defined in UEFI specification.
http://www.uefi.org/specs/download/UEFI_Spec_2_3_1.pdf, so I think this RFC
should still be on the standards track.

As for using the GUID in the document, at the risk of quoting Wikipedia
(again),

A *globally unique identifier* (*GUID*, [image: play]
/<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English>
> ˈ <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>ɡ<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>
> uː <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>ɪ<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>
> d <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>/<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English>
>  or / <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English>ˈ<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>
> ɡ <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>w<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>
> ɪ <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>d<http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English#Key>
> / <http://en.wikipedia.org/wiki/Wikipedia:IPA_for_English>) is a unique
> reference number used as an identifier in computer software<http://en.wikipedia.org/wiki/Computer_software>.
> The term *GUID*also is used for Microsoft<http://en.wikipedia.org/wiki/Microsoft>'s
> implementation of the Universally Unique Identifier<http://en.wikipedia.org/wiki/Universally_Unique_Identifier> (UUID)
> standard.
> The value of a GUID is represented as a 32-character hexadecimal<http://en.wikipedia.org/wiki/Hexadecimal> string,
> such as {21EC2020-3AEA-1069-A2DD-08002B30309D}, and is usually stored as a
> 128-bit integer. The total number of unique keys is 2128 or 3.4×1038. This
> number is so large that the probability of the same number being generated
> randomly twice is negligible.
> Still, certain techniques have been developed to help ensure that GUID
> numbers are not duplicated (see Algorithm<http://en.wikipedia.org/wiki/Globally_unique_identifier#Algorithm>
>  below).


Responding directly to Benny's question about the GUID:

The UEFI specification defines only three partition types, and proscribes
that "OS vendors need to generate their own Partition Type GUIDs to identify
their partition types."  The purpose of using a GUID is to avoid the
necessity of a global registry of partition types (for better or for worse).

-Jason


On Thu, Jul 7, 2011 at 1:12 PM, Jason Glasgow <[e-mail]> wrote:

> The GPT is defined in
>
> Extensible Firmware Interface
> Specification
> Version 1.10
> December 1, 2002
>
> http://www.intel.com/technology/efi/efiagree.htm
>
> -Jason
>
> On Thu, Jul 7, 2011 at 1:04 PM, Jim Rees <[e-mail]> wrote:
>
>> Benny Halevy wrote:
>>
>>  On 2011-07-07 19:34, [e-mail] wrote:
>>  > I don't think the two of you have the same memory :-).
>>  >
>>  > What's the problem with use of GPT?
>>
>>  There is no formal standard for it as far as I see
>>
>> Isn't it part of UEFI?  Which may be problematical if it requires a
>> license,
>> but would still be a published standard.
>>
>> Besides, Wikipedia says it's a standard, so it must be true.
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>
>