[mythtv-users] question about RAID

chris@cpr.homelinux.net chris at cpr.homelinux.net
Tue Jan 10 07:33:00 UTC 2006

On Mon, Jan 09, 2006 at 08:53:31PM -0500, Steve Adeff wrote:
> If I can add drives in after initial creation, I could add in more of my 
> 320gig drives I have with other media on them, increase write speed a bit and 
> not worry about losing the other data as well.

You can't increase the number of active devices in a RAID-5 (mdadm) 
array because the distribution of data and parity is set when the 
array is first created.  To increase the capacity of the array you 
would need to increase the capacity of all of the constituent 
devices, "grow" the array to take up the extra space and then resize 
the hosted filesystem.

"When fascism comes to America, it will be wrapped in the flag and 
carrying the cross." - Sinclair Lewis (1935)

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