On Thu, Apr 24, 2008 at 10:21:20AM +0100, Doug Rabson wrote: > > On 23 Apr 2008, at 21:54, Marcel Moolenaar wrote: > >> >> On Apr 23, 2008, at 12:09 PM, John Baldwin wrote: >> >>> On Wednesday 23 April 2008 02:54:40 pm Doug Rabson wrote: >>>> >>>> On 23 Apr 2008, at 19:48, John Baldwin wrote: >>>> >>>>> jhb 2008-04-23 18:48:36 UTC >>>>> >>>>> FreeBSD src repository >>>>> >>>>> Modified files: (Branch: RELENG_7) >>>>> sbin/gpt gpt.c >>>>> Log: >>>>> MFC: Add 'zfs' as an alias for the FreeBSD ZFS UUID. >>>> >>>> Does it make sense to have a FreeBSD ZFS UUID? ZFS is a portable >>>> filesystem format - shouldn't we use whatever UUID Solaris uses for >>>> ZFS in GPT? >>> >>> That's a good question. Maybe pjd@ or marcel@ have opinions on the >>> matter? >> >> There's no such UUID as far as I know, so I thought it safer >> to create a FreeBSD-specific one because we already have >> incompatibilities between operating systems for things like >> UFS and BSD labels. While ZFS may be portable, I'm not at all >> sure that different OSes are feature compatible and for that >> it's good to know where the ZFS originates from. Also, we may >> create an UUID with the intend that it's a common UUID, but >> getting other OSes to use that UUID is far from easy. > > As far as I can make out from the Solaris source, it uses: > > 6a898cc3-1dd2-11b2-99a6-080020736631 V_USR > > Unfortunately it seems to use this UUID for lots of other things too. I > think it sets the partition name to "zfs" for partitions that are part of a > ZFS pool.
From libzfs_pool.c:
2628 * Why we use V_USR: V_BACKUP confuses users, and is considered
2629 * disposable by some EFI utilities (since EFI doesn't have a
backup
2630 * slice). V_UNASSIGNED is supposed to be used only for zero
size
2631 * partitions, and efi_write() will fail if we use it. V_ROOT,
V_BOOT,
2632 * etc. were all pretty specific. V_USR is as close to reality
as we
2633 * can get, in the absence of V_OTHER.
To Solaris administrators, the majority of the V_ p_tag values are
considered exactly equivalent, since the format(1M) command allows you
to set them to anything when an SMI label is used.
Ceri
--
That must be wonderful! I don't understand it at all.
-- Moliere
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