Date: Thu, 25 Jun 2015 17:57:18 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: William Dudley <wfdudley@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: how to fix "CORRUPT" partition table in mirrored drive Message-ID: <alpine.BSF.2.20.1506251748060.55563@wonkity.com> In-Reply-To: <CAFsnNZ%2BzZJoKmAAbOUtoCoYf8_zn6vLkq2CdgFMWitK5F%2B2YKQ@mail.gmail.com> References: <CAFsnNZ%2BzZJoKmAAbOUtoCoYf8_zn6vLkq2CdgFMWitK5F%2B2YKQ@mail.gmail.com>
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On Thu, 25 Jun 2015, William Dudley wrote: > I have a mirrored drive: > > gpart show -l > => 63 78156225 ad0 MBR (37G) > 63 78156162 1 (null) [active] (37G) > 78156225 63 - free - (31k) > > => 0 78156162 ad0s1 BSD (37G) > 0 41943040 1 (null) (20G) > 41943040 2097152 2 (null) (1.0G) > 44040192 34115970 4 (null) (16G) > > => 63 3907029104 mirror/gm0 MBR (1.8T) [CORRUPT] > 63 3907029105 1 (null) [active] (1.8T) > > => 0 3907029105 mirror/gm0s1 BSD (1.8T) > 0 335544320 4 (null) (160G) > 335544320 209715200 5 (null) (100G) > 545259520 209715200 6 (null) (100G) > 754974720 3152054385 7 (null) (1.5T) > > I tried to fix the corrupt partition table like this: > > gpart recover mirror/gm0 > gpart: recovering 'mirror/gm0' failed: Function not implemented > > So how do I fix the corrupt partition table? Can I un-mirror the two drives > and then do the gpart recover and then re-mirror them? gpart recover only works with some partitioning schemes. GPT has a backup copy of the partition table that can be used to recover the primary one. MBR and BSD partitioning schemes do not have redundant metadata for recover to use.
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