Re: RAID 6 grow problem

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On Saturday June 2, groups@xxxxxxxxxxxxxxxxxxxxxx wrote:
> > raid6 reshape wasn't added until 2.6.21.  Before that only raid5 was
> > supported.
> > You also need to ensure that CONFIG_MD_RAID5_RESHAPE=y.
> 
> I don't see that in the config. Should I add it? Then reboot?

You reported that you were running a 2.6.20 kernel, which doesn't
support raid6 reshape.
You need to compile a 2.6.21 kernel (or 
   apt-get install linux-image-2.6.21-1-amd64
or whatever) and ensure that CONFIG_MD_RAID5_RESHAPE=y is in the
.config before compiling.

> 
> I used apt-get install mdadm to first install it, which gave me 2.5.x then I
> downloaded the new source and typed make then make install. Now mdadm -V
> shows "mdadm - v2.6.2 - 21st May 2007".
> Is there anyway to check it is installed correctly?

The "mdadm -V" check is sufficient.

NeilBrown
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