Date: Thu, 7 Sep 2017 10:34:19 +0300 From: Christos Chatzaras <chris@cretaforce.gr> To: freebsd-questions@freebsd.org Subject: Re: problem booting from 2nd drive Message-ID: <AA43F3D2-3C09-4A6E-844E-4491EDA36562@cretaforce.gr> In-Reply-To: <8a798574-5d68-d6a3-259f-e971d1e30e4e@fjl.co.uk> References: <4B828DE3-C784-45A9-A01B-F944DAFE1601@cretaforce.gr> <8a798574-5d68-d6a3-259f-e971d1e30e4e@fjl.co.uk>
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> Why not dump out the GPT on both and take a look?
>
gpart show
=> 40 7814037088 ada0 GPT (3.6T)
40 472 1 freebsd-boot (236K)
512 8388608 2 freebsd-ufs (4.0G)
8389120 134217728 3 freebsd-swap (64G)
142606848 33554432 4 freebsd-ufs (16G)
176161280 134217728 5 freebsd-ufs (64G)
310379008 33554432 6 freebsd-ufs (16G)
343933440 1073741824 7 freebsd-ufs (512G)
1417675264 6396361856 8 freebsd-ufs (3.0T)
7814037120 8 - free - (4.0K)
=> 40 7814037088 ada1 GPT (3.6T)
40 472 1 freebsd-boot (236K)
512 8388608 2 freebsd-ufs (4.0G)
8389120 134217728 3 freebsd-swap (64G)
142606848 33554432 4 freebsd-ufs (16G)
176161280 134217728 5 freebsd-ufs (64G)
310379008 33554432 6 freebsd-ufs (16G)
343933440 1073741824 7 freebsd-ufs (512G)
1417675264 6396361856 8 freebsd-ufs (3.0T)
7814037120 8 - free - (4.0K)
dd if=/dev/ada0 of=./bootcode_ada0 count=1
1+0 records in
1+0 records out
512 bytes transferred in 0.013218 secs (38736 bytes/sec)
dd if=/dev/ada1 of=./bootcode_ada1 count=1
1+0 records in
1+0 records out
512 bytes transferred in 0.012451 secs (41120 bytes/sec)
diff bootcode_ada0 bootcode_ada1
diff shows the files have no differences
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Subject: Re: problem booting from 2nd drive
Date: Thu, 7 Sep 2017 10:09:34 +0300
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> P.P.S. Dumb question - when you say you create a geom mirror, I assume =
this isn't for the whole disk. If you did try this I'd expect it to =
throw an error saying that the backup GPT was corrupt on ada0, but you =
said it booted normally. If my assumption is wrong, you need to read up =
on GPT and Geom Mirror compatibility.
Yes see my previous message. I do seperate gmirror for each partition so =
GPT and gmirror don't write both at the last part of the disk.=
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