On 07/09/21 01:44, Ryan Patterson wrote: > My file server is usually very stable. The past week I had two mdadm > arrays that required recync operations. > * newly created raid6 array (14 x 16TB seagate exos) > * existing raid 6 array, after a reboot resync on hot spare (14 x 4TB > seagate barracuda) Aaarghhh See https://raid.wiki.kernel.org/index.php/Linux_Raid And especially https://raid.wiki.kernel.org/index.php/Timeout_Mismatch That might not be your problem, but it's the very first thing you should address! Cheers, Wol