Re: very degraded RAID5, or increasing capacity by adding discs

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On Tuesday October 9, babydr@xxxxxxxxxxxxxxxx wrote:
>  	Hello Neil ,
> 
> On Tue, 9 Oct 2007, Neil Brown wrote:
> > On Tuesday October 9, janek_listy@xxxxx wrote:
> >>
> >> Problems at step 4.: 'man mdadm' doesn't tell if it's possible to
> >> grow an array to a degraded array (non existant disc). Is it possible?
> >
> > Why not experiment with loop devices on files and find out?
> >
> > But yes:  you can grow to a degraded array providing you specify a
> > --backup-file.
>  	Is there an estimate of how large this file can get ?
>  	It's probably a calculation based on disk & array parameters .
>  	But I was unable to find a reference on it from the manpage .
> 
>  		Tia ,  JimL

I think:

   chunk-size * old-ndisks * new-ndisks * 2 + 1K

It might be smaller than that, but it shouldn't be larger.

NeilBrown
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