On Sat, 8 Jun 2013 20:18:10 +0200 Ramon Hofer <ramonhofer@xxxxxxxxxx> wrote: > My home server with a linear raid (md0) containing three raid5 (md1, > md2, md3) is still working wonderfully. Thanks again Stan! > > Now I'm planning to add a fourth raid5 to the linear array. You should have used LVM instead of md linear to join your RAIDs into a single block device. LVM allows placing a single logical volume over physical extents placed in all sorts of non-contiguous, fragmented, overlapping fashions. You could also transparently migrate portions of those physical extents between physical arrays without even having to unmount the filesystem that you have on the LV. -- With respect, Roman
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