how to fix "CORRUPT" partition table in mirrored drive
galtsev at kicp.uchicago.edu
Fri Jun 26 14:58:49 UTC 2015
On Thu, June 25, 2015 7:04 pm, William Dudley wrote:
> Again, thanks for the reply. Does the fact that gpart show -l reports
> => 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
> 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.
> Bill Dudley
> This email is free of malware because I run Linux.
I wouldn't say that this statement is strictly speaking correct.
> On Thu, Jun 25, 2015 at 7:57 PM, Warren Block <wblock at 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
>>> and then do the gpart recover and then re-mirror them?
>> gpart recover only works with some partitioning schemes. GPT has a
>> 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
>> to use.
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Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
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