Re: Raid array empty after restart

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On Mon, 2020-05-25 at 15:43 -0700, Samuel Sieb wrote:
> > That decision was taken by mdadm without input from me, i.e. it's the
> > default. I see there is an "--assume-clean" option which would possibly
> > have skipped that step, though the man page doesn't recommend it unless
> > you know what you're doing, which I clearly don't. All the same, saying
> > "the partition table *will* be lost or meaningless after creating
> > array" is certainly wrong.
> 
> 
> It's not wrong.  You were in a very special case where you are 
> 
> recreating the same raid from two drives that were in exactly the same 
> 
> configuration.  In any other case, the partition table would be 
> 
> overwritten or would be invalid.  You probably could have even used the 
> 
> "--assume-clean" option to avoid the resync.

Certainly it's a special case, but the message is still wrong to state
that something will happen when it won't. As I said, mdadm has detected
the existence of an array, and knows (or can easily discover) what its
parameters are, and therefore know that the new creation will not
change them.

poc
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