Date: Mon, 29 Jun 2009 16:49:01 +0200 From: =?ISO-8859-1?Q?Marius_N=FCnnerich?= <marius@nuenneri.ch> To: "Patrick M. Hausen" <hausen@punkt.de> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: Zpool on raw disk and weird GEOM complaint Message-ID: <b649e5e0906290749l657fe494xbf0cb3d19702d52f@mail.gmail.com> In-Reply-To: <b649e5e0906290741h28dbaf1bwc05352a03c3b52aa@mail.gmail.com> References: <20090629094359.GB24054@hugo10.ka.punkt.de> <b649e5e0906290411n7b501affhfaec1cf1469073ff@mail.gmail.com> <20090629114610.GA28731@hugo10.ka.punkt.de> <b649e5e0906290638i5cf9f26en5e6a8dd9c43f2fb7@mail.gmail.com> <20090629141437.GD31011@hugo10.ka.punkt.de> <b649e5e0906290741h28dbaf1bwc05352a03c3b52aa@mail.gmail.com>
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On Mon, Jun 29, 2009 at 16:41, Marius Nünnerich<marius@nuenneri.ch> wrote: > On Mon, Jun 29, 2009 at 16:14, Patrick M. Hausen<hausen@punkt.de> wrote: >> Hi! >> >> On Mon, Jun 29, 2009 at 03:38:51PM +0200, Marius Nünnerich wrote: >> >>> I'm sorry, it should have said: >>> dd if=/dev/da0 count=4 | hd >> >> 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 000001b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff |................| >> 000001c0 ff ff ee ff ff ff 01 00 00 00 ff ff ff ff 00 00 |................| >> 000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.| >> 00000200 45 46 49 20 50 41 52 54 00 00 01 00 5c 00 00 00 |EFI PART....\...| >> 00000210 2d e8 5e 91 00 00 00 00 01 00 00 00 00 00 00 00 |-.^.............| >> 00000220 ff ff 3f d1 01 00 00 00 22 00 00 00 00 00 00 00 |..?.....".......| >> 00000230 de ff 3f d1 01 00 00 00 47 b5 79 82 96 d5 dc 11 |..?.....G.y.....| >> 00000240 be 97 00 0a e4 85 78 5e 02 00 00 00 00 00 00 00 |......x^........| >> 00000250 80 00 00 00 80 00 00 00 3e 0b 98 53 00 00 00 00 |........>..S....| >> 00000260 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000400 b6 7c 6e 51 cf 6e d6 11 8f f8 00 02 2d 09 71 2b |.|nQ.n......-.q+| >> 00000410 16 b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |..y...........x^| >> 00000420 22 00 00 00 00 00 00 00 de ff 3f d1 01 00 00 00 |".........?.....| >> 00000430 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000490 26 b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |&.y...........x^| >> 000004a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000510 37 b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |7.y...........x^| >> 00000520 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000590 48 b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |H.y...........x^| >> 000005a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000610 59 b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |Y.y...........x^| >> 00000620 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000690 6a b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |j.y...........x^| >> 000006a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000710 7a b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |z.y...........x^| >> 00000720 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| >> * >> 00000790 8b b6 79 82 96 d5 dc 11 be 97 00 0a e4 85 78 5e |..y...........x^| >> 000007a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| > > OK, there is the GPT signature which reads "EFI PART" at offset 0x200. > What was on the disk before? > I think it should look different. There is a document from sun which > explains the ZFS ondisk format and and I don't remember it to look > like a MBR and GPT ;) Sorry, I don't have the time right now to dig > through it. Found it quickly. Here is the document: http://opensolaris.org/os/community/zfs/docs/ondiskformat0822.pdf See section 1.3.1. ZFS is not cleaning the first 8KB of the raw device so GEOM_PART will taste it and it looks like a broken GPT to it. For future constructions of zpool's one should zero the first few sectors of a device. For your specific I would make a tested backup and then zero the first 1KB of da0. But beware that it's dangerous! Don't blame me if you lose data or hair!
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