Re: RAID 6 grow problem

[Iain Rauch <groups@email.iain.rauch.co.uk>]

>>> 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.

There only seems to be version 2.6.20 does this matter a lot? Also how do I
specify what is in the config when using apt-get install?

>> 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.

Are you sure because at first I just did the make/make install and mdadm -V
did tell me v2.6.2 but I don't believe it was installed properly because it
didn't recognise my array nor did it make a config file, and cat
/proc/mdstat said no file/directory??


Iain