On Mon, Dec 14 2015, Micheal Blue wrote: > I have a 3 disk RAID5 currently that uses LUKS. I would like to add a new disk and covert the array to RAID10 but cannot find any walk-through of this process. I am grateful for any input from the list be it links or a personal summary. > > > Below is a graphic of how my current 3 drive array is setup: > --------------------------------------- > [ ext4 file system ] > --------------------------------------- > [ LUKS cryptdevice ] > --------------------------------------- > [ /dev/dm0 ] > --------------------------------------- > [ /dev/sdb1 ] [ /dev/sdc1 ] [ /dev/sdd1 ] > --------------------------------------- I assume that is /dev/md0, not /dev/dm0 .... You would need to convert to RAID0 first. Something like mdadm --grow /dev/md0 --level=0 --raid-disks=2 # wait for that to complete mdadm --grow /dev/md0 --level=10 --raid-disks=4 --add /dev/sdd1 /dev/sde1 You should experiment first by creating some largish file (100Meg), using losetup to make block devices /dev/loop0, /dev/loop1 ... /dev/loop3 then create a raid 5 of some of those devices, creaet a LUKS and ext4 on that, and then perform the reshape and make sure it all works as you expect. I just tested and it seemed to work on the kernel and mdadm that I have. Of course, if you can create a backup - at least of the most important files - that is always a good idea. NeilBrown
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