Hi guys, I have issues with RAID5 running on post-2020 14TB drives. I am getting max writting speeds of 220MBs. If I understood properly docs, RAID5 with three drives should have 2x write/read speeds. Single drive tests running 190-220MBs, no issues in SMART reports. RAID5 with 4 drives...same speed. RAID10 should have 2x write, 4x read...still running 220MBs max as RAID5 I have played with chunk size...default 512k-2MBs...no difference "Read-ahead" set for md0 virtual disk NCQ disabled - set 1 for all physical drives I have basically tried every suggestion on famous ArchWiki. I have tried SAS2 HBA...same results. Initial resync drops to 130MBs Debian 12 running on SuperMicro 10 series MB. 32GB RAM, cpu max 30% load during tests/real-life copy. Is it possible this weird issue is linked to HDD timeout described there >>> https://archive.kernel.org/oldwiki/raid.wiki.kernel.org/index.php/Timeout_Mismatch.html Any suggestion, please? Array should be doing 260-560MBs with ease Regards Hajes
