On 25/12/17 21:53, NeilBrown wrote: > On Mon, Dec 25 2017, Gandalf Corvotempesta wrote: > >> Hi to all >> I have a server with a 3way mirror. >> As I have to increase the total available space, one solution would be to >> replace all disks with bigger ones, but this is expensive. >> >> Another solution would be to add just one disk and then reshape from >> RAID-1 to RAID-6 >> >> Do you have any guide on how to do this reshape on a running array ? >> Thank you. > > I suggest you add the new device with "mdadm --add", then try the > reshape with "mdadm --grow /dev/mdXXX --level=6 --raid-devices-4". > > It might not work quite that easily - I think you need to first convert > the raid1 to a 2-way mirror, but that is easy enough > > mdadm --grow /dev/mdxxx --raid-devices=2 That was my reaction. I'm 99% certain that a three-way will not reshape. > > NeilBrown > Cheers, Wol -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
