Hi Song, On Fri, Jan 15, 2021 at 8:58 AM Song Liu <song@xxxxxxxxxx> wrote: > > Are you running kernel 5.10? If so, please upgrade to 5.10.1 or later. > There was an > bug in 5.10 kernel. After upgrading the kernel, the mdadm --grow command above > should fix this. The --grow will trigger a resync for the newly grown > area. If the array > was not in degraded mode, the resync should not change any data. I was indeed running 5.10.0 a few times. Upgraded and running "mdadm --grow --size=max /dev/md0" fixed it completely. > > Please let me know if this works. Yes. Thank you. marcus