On Wed, 12 Jan 2011 12:29:30 +0500 Roman Mamedov <rm@xxxxxxxxxx> wrote: > Hello! > > I am considering to move my configuration in which I currently use two RAID5 > arrays (3*2TB and 3*1TB) to one described in [1]. Specifically, make a 6*1TB > RAID6 plus 3*1TB RAID5 consisting of 2TB drives' "tails". > > My question is: does mdadm support a simultaneous reshape, changing at once: > 1) RAID5 to RAID6 > 2) number of devices from 3 to 6 > 3) individual device size from 2TB to 1TB > > Note that the user-accessible space after this reshape does not change, and > remains at 4 TB. So is that supported? Will that require a backup file? Will > that proceed particularly inefficiently/slowly? > > [1] http://www.linuxconfig.org/prouhd-raid-for-the-end-user > Sorry, but no. It could be implemented, probably without a lot of difficulty, but it hasn't been. NeilBrown
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