On Thu, Mar 14, 2019 at 10:59 AM Noah Massey <noah.mas...@gmail.com> wrote: > > On Wed, Mar 13, 2019 at 6:13 PM Jakub Husák <ja...@husak.pro> wrote: > > > > Sorry, fighting with this technology called "email" :) > > > > > > Hopefully better wrapped outputs: > > > > On 13. 03. 19 22:58, Jakub Husák wrote: > > > > > > > Hi, > > > > > > I added another disk to my 3-disk raid5 and ran a balance command. > > > After few hours I looked to output of `fi usage` to see that no data > > > are being used on the new disk. I got the same result even when > > > balancing my raid5 data or metadata. > > > > > Am I correct in rephrasing your issue into "balancing 3 copy raid5 > does not rebalance into 4 copy raid5"? Because that was a surprising > result to me, but may be a spec that I wasn't aware of. >
Maybe it's because the new disk does not have any RAID5 block groups? To test, I'd usually suggest adding bogus data until something got pushed to sdd, then try a balance and remove the temp data. In your case, it might be hard since all 3 disks have a similar amount of unused data. What happens if you 'dev remove' one of the old drives, and then add it back in? In case it's not clear, I'm throwing spaghetti here. Have backups.
