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 N=FCnnerich<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 N=FCnnerich wrote: >> >>> I'm sorry, it should have said: >>> dd if=3D/dev/da0 count=3D4 | hd >> >> 00000000 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 000001b0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 ff =A0|.....= ...........| >> 000001c0 =A0ff ff ee ff ff ff 01 00 =A000 00 ff ff ff ff 00 00 =A0|.....= ...........| >> 000001d0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 000001f0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 55 aa =A0|.....= .........U.| >> 00000200 =A045 46 49 20 50 41 52 54 =A000 00 01 00 5c 00 00 00 =A0|EFI P= ART....\...| >> 00000210 =A02d e8 5e 91 00 00 00 00 =A001 00 00 00 00 00 00 00 =A0|-.^..= ...........| >> 00000220 =A0ff ff 3f d1 01 00 00 00 =A022 00 00 00 00 00 00 00 =A0|..?..= ...".......| >> 00000230 =A0de ff 3f d1 01 00 00 00 =A047 b5 79 82 96 d5 dc 11 =A0|..?..= ...G.y.....| >> 00000240 =A0be 97 00 0a e4 85 78 5e =A002 00 00 00 00 00 00 00 =A0|.....= .x^........| >> 00000250 =A080 00 00 00 80 00 00 00 =A03e 0b 98 53 00 00 00 00 =A0|.....= ...>..S....| >> 00000260 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000400 =A0b6 7c 6e 51 cf 6e d6 11 =A08f f8 00 02 2d 09 71 2b =A0|.|nQ.= n......-.q+| >> 00000410 =A016 b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|..y..= .........x^| >> 00000420 =A022 00 00 00 00 00 00 00 =A0de ff 3f d1 01 00 00 00 =A0|"....= .....?.....| >> 00000430 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000490 =A026 b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|&.y..= .........x^| >> 000004a0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000510 =A037 b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|7.y..= .........x^| >> 00000520 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000590 =A048 b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|H.y..= .........x^| >> 000005a0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000610 =A059 b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|Y.y..= .........x^| >> 00000620 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000690 =A06a b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|j.y..= .........x^| >> 000006a0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000710 =A07a b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|z.y..= .........x^| >> 00000720 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| >> * >> 00000790 =A08b b6 79 82 96 d5 dc 11 =A0be 97 00 0a e4 85 78 5e =A0|..y..= .........x^| >> 000007a0 =A000 00 00 00 00 00 00 00 =A000 00 00 00 00 00 00 00 =A0|.....= ...........| > > 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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