On Wed, 19 Sep 2012 16:20:58 +1000 NeilBrown <neilb@xxxxxxx> wrote: > What you need to do is: > - make sure the filesystem in /dev/md1 doesn't use the last 3k (it probably > uses a 4K block size, so cannot use that last bit > - resize the array down to 488372860K (mdadm -G /dev/md0 --size 488372860) > - convert to a 2-device RAID5 with a 4K chunk size: > mdadm -G /dev/md1 -c 4K -l5 -n2 > - convert to a 3-device RAID5 with a 64K chunk size: > mdadm -G /dev/md1 -c 64k -n3 > > NeilBrown Thanks, Neil. I have since finished this migration in another way, luckily I had some spare drives lying around, so had an option to create a separate RAID5 from scratch and move over & replace the drives one by one. By the way the "want_replacement" feature is totally awesome, thanks to it at no point in my operations I was left without redundancy (after all a N-disk degraded RAID5 reliability-wise is like a RAID0 of N disks, and that's something I wanted to avoid having even for a short period). -- With respect, Roman ~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Stallman had a printer, with code he could not see. So he began to tinker, and set the software free."
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