Re: Shrinking number of devices on a RAID-10 (near 2) array

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On Sun, Aug 24, 2014 at 04:45:07PM +1000, NeilBrown wrote:
> > >      Array Size : 471859200 (450.00 GiB 483.18 GB)
> > >   Used Dev Size : 309363520 (295.03 GiB 316.79 GB)
> 
> This is a near=2 6 drive RAID10, so Array Size should be 3 times Used Dev
> Size.
> The fact that it isn't shows that he has already explicitly set the
> --array-size to something appropriate.   I'm sure he reduced the size of the
> filesystem first as the man page says:

Yup, it's an LVM PV so I did pvresize and mdadm --array-size first
to some safe lower value, before I realised that mdadm would have
told me the exact --array-size I needed anyway.

I should have mentioned that to reduce confusion, but it didn't
seem pertinent to where I got stuck.

Cheers,
Andy
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