Date: Fri, 26 Jun 2015 09:58:48 -0500 (CDT) From: "Valeri Galtsev" <galtsev@kicp.uchicago.edu> To: "William Dudley" <wfdudley@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: how to fix "CORRUPT" partition table in mirrored drive Message-ID: <20908.128.135.70.2.1435330728.squirrel@cosmo.uchicago.edu> In-Reply-To: <CAFsnNZKuZ9bXGWP%2Be18B=2pPFrBTjd---V1M2D_kcULz7yWhAQ@mail.gmail.com> References: <CAFsnNZ%2BzZJoKmAAbOUtoCoYf8_zn6vLkq2CdgFMWitK5F%2B2YKQ@mail.gmail.com> <alpine.BSF.2.20.1506251748060.55563@wonkity.com> <CAFsnNZKuZ9bXGWP%2Be18B=2pPFrBTjd---V1M2D_kcULz7yWhAQ@mail.gmail.com>
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On Thu, June 25, 2015 7:04 pm, William Dudley wrote: > Warren, > > Again, thanks for the reply. Does the fact that gpart show -l reports > this: > > => 63 3907029104 mirror/gm0 MBR (1.8T) [CORRUPT] > > Mean that I'm screwed and must copy all the data to a new drive and > create the mirror anew? > > Can I remove the second drive from the mirror and still have the data on > it > accessible? > the gmirror man page doesn't say what the disks that are removed from the > mirror "look like", > i.e. are they in some wierd format or can they be read like a normal disk. > > Thanks, > Bill Dudley > > > This email is free of malware because I run Linux. I wouldn't say that this statement is strictly speaking correct. Valeri > > On Thu, Jun 25, 2015 at 7:57 PM, Warren Block <wblock@wonkity.com> wrote: > >> 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. >> > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
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