Re: raid issues after power failure

[David Greaves <david@dgreaves.com>]

Francois Barre wrote:
> 2006/7/1, Ákos Maróy <darkeye@tyrell.hu>:
>> Neil Brown wrote:
>> > Try adding '--force' to the -A line.
>> > That tells mdadm to try really hard to assemble the array.
>>
>> thanks, this seems to have solved the issue...
>>
>>
>> Akos
>>
>>
> 
> Well, Neil, I'm wondering,
> It seemed to me that Akos' description of the problem was that
> re-adding the drive (with mdadm not complaining about anything) would
> trigger a resync that would not even start.
> But as your '--force' does the trick, it implies that the resync was
> not really triggered after all without it... Or did I miss a bit of
> log Akos provided that did say so ?
> Could there be a place here for an error message ?
> 
> More generally, could it be usefull to build up a recovery howto,
> based on the experiences on this list (I guess 90% of the posts a
> related to recoveries) ?
> Not in terms of a standard disk loss, but in terms of a power failure
> or a major disk problem. You know, re-creating the array, rolling the
> dices, and *tada !* your data is back again... I could not find a bit
> of doc about this.
> 

Francois,
I have started to put a wiki in place here:
  http://linux-raid.osdl.org/

My reasoning was *exactly* that - there is reference information for md
but sometimes the incantations need a little explanation and often the
diagnostics are not obvious...

I've been subscribed to linux-raid since the middle of last year and
I've been going through old messages looking for nuggets to base some
docs around.

I haven't had a huge amount of time recently so I've just scribbled on
it for now - I wanted to present something a little more polished to the
community - but since you're asking...

So don't consider this an official announcement of a useable work yet -
more a 'Please contact me if you would like to contribute' (just so I
can keep track of interested parties) and we can build something up...

David
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