I have no intentions of recreating at all. I fully understand the implications (I've had stripe orders go bad on truly massive scales before, I don't ever wanna experience that again), I just don't know mdadm as well as other vendor storage.
I was able to ddrescue a copy of sdb with no errors. I assembled the array and got a file system metadata dump (this is HUGE) and it's currently rebuilding before I even look at data. Thank you all for your help, patience was absolutely key here.
On Apr 30, 2013, at 7:45 AM, Phil Turmel <philip@xxxxxxxxxx> wrote:
> On 04/30/2013 02:20 AM, Sam Bingner wrote:
>> On Apr 29, 2013, at 4:33 PM, "Gimpbully" <gimpbully@xxxxxxxxx>
>> wrote:
>>> On Apr 13, 2013, at 7:20 AM, Sam Bingner <sam@xxxxxxxxxxx> wrote:
>>>
>>>> After that you can try to recreate the array with the proper
>>>> order (sdc1, sdb1, sde1, missing, sda1) and copy data off or add
>>>> the spare in again depending on if you were able to recover all
>>>> the data wih GNU ddrescue.
>>>
>>>
>>> What do you mean recreate? what's the specific command? something
>>> like:
>>> mdadm --create --assume-clean --level=5 --raid-devices=5 /dev/md127
>>> /dev/sdc1 /dev/sdb1 /sdv/sde1 missing /dev/sda1
>>
>> Don't recreate it - I said the wrong thing... You want to do an
>> assemble on them with force if possible... Recreate is last ditch and
>> make sure you have another copy if you do the previous command in
>> case it doesn't work right due to offsets etc...
>>
>> try:
>> mdadm --stop /dev/md127
>> mdadm --assemble --force /dev/md127 /dev/sd{c,b,e,a}1
>
> Yes.
>
>> If you DO need to recreate it, what you showed looks correct.
>
> NO!
>
> The OP has *not* shared sufficient information on the array members to
> say that. Since it has "worked for years", the odds of an offset error
> is *very* high. Chunk size defaults are also likely to be different.
>
> *Complete* output of "mdadm -E" for the array members is needed before
> any "--create" operation is attempted. Plus the distro info, kernel
> version, and mdadm version .
>
> Phil
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