Re: Strange RAID-5 rebuild problem

[Michael Guntsche <mike@xxxxxxxxxxxx>]

On Mar 2, 2008, at 11:09, Michael Tokarev wrote:

> Michael Guntsche wrote:
> []
> > Answering myself here after reading through the manapges, this  
> > seems to be a regression. Furthermore this may yield to some nasty  
> > data corruption, well at least I think it will.
> > * --stop the array while resyncing.
> > * set start_ro to 1
> > * Start the array, automatic reconstruction does not start even  
> > after the data is been written to the ARRAY
>
> You can't write any data to a read-only array.

From the manpage:

md_mod.start_ro=1
This  tells  md  to start all arrays in read-only mode.  This is a  
soft read-only
that will automatically switch to read-write on the first write  
request.  However
until that write request, nothing is written to any device by md, and  
in particu‐
lar, no resync or recovery operation is started.

So apparently it does switch to read-write on the first write  
request, but the rebuild is not continuing.

Kind regards,
Michael

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