Date: Mon, 28 Feb 2011 09:54:09 +0100 From: "Johan Hendriks" <Johan@double-l.nl> To: "Andrey V. Elsukov" <bu7cher@yandex.ru> Cc: freebsd-stable@freebsd.org Subject: RE: 8.2-RELEASE - gmirror and gpart issue. Metadata overlap? Message-ID: <57200BF94E69E54880C9BB1AF714BBCBDD318F@w2003s01.double-l.local> References: <AANLkTimsRDV=Z4Ansd2seWUGN7C7f-5SZB=6w13kAK%2BY@mail.gmail.com> <4D694336.3090203@yandex.ru>
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On 26.02.2011 15:26, Marin Atanasov Nikolov wrote: >> After a reboot I get this right before the FreeBSD bootloader starts: >>=20 >> gptboot: invalid GPT backup header >>=20 >> I suppose this error simply means that gpart can't find it's backup=20 >> header, because gmirror and gpart both are using the last sectors for >> a provider to write it's metadata. >This message is from gptboot. Loader does not know about your software mirror and it just checks GPT headers in the second and last LBA. >As i see now, there is inconsistency in the behavior between gptboot and GEOM_PART_GPT. >gptboot does reading of GPT backup header from the last LBA, but GEOM_PART_GPT from the alternate LBA which is not equal to last LBA in your case. >> Which would mean that gmirror and gpart metadata overlap, and that's=20 >> why I see this message? >No. >> Anyway, I can still boot from the primary GPT header, and here's the=20 >> second message I get during boot: >>=20 >> GEOM: ad0: secondary GPT header is not in the last LBA. >>=20 >> Why does GEOM reports ad0, and not mirror/gm0 as the provider? I've=20 >> used the gmirror'ed device for gpart, not ad0. >This is how GEOM tasting works. Do you have any problem except for those messages? What does not work? >Also when you are writing problem report about gpart it will be not bad to add output of `gpart show` or `gpart list` commands. >And `gmirror list` for GEOM_MIRROR. I opened a discussion on this before the release. http://lists.freebsd.org/pipermail/freebsd-stable/2011-January/061184.ht ml On my 8.1 system, i get this message about the corrupt headers, but it booted on the 8.2 system it panics... I think a lot of people are going to get bit by this. As far as i know there is no warning anywhere that you can not use gpart and gmirror the whole disk. I also get this answer: << Maybe the boot process was made to be more standard-compliant :) >>> That is not the way it should work, well we make the boot process more standard compliant, bad luck for those who thougt it worked. I also convert back to normal partitioning and gmirror. Regards Johan =20
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