We have a newly built RAID6 array built using the LVM subsystem. It comprises 12-off 1TB NVME drives and 12 stripes to match the number of drives. The performance seems to be limited by the single [mdX_raid6] kernel thread which 'top' shows is maxed out at 100% CPU (on a single core) when performance testing the array. The kernel is a fairly old one (Redhat's 3.10.0-1160.114.2.el7.x86_64) on a Centos7 system. A cursory googling of the topic does not suggest that later kernels (e.g. Redhat's 5.14.0-362.18.1.el9_3.x86_64 should we upgrade the system to an EL9 distro) have multi-threaded this... Can anyone comment ? Many thanks Tom Crane. ps. I'm not subscribed to this ML so please CC me when replying. This email, its contents and any attachments are intended solely for the addressee and may contain confidential information. In certain circumstances, it may also be subject to legal privilege. Any unauthorised use, disclosure, or copying is not permitted. If you have received this email in error, please notify us and immediately and permanently delete it. Any views or opinions expressed in personal emails are solely those of the author and do not necessarily represent those of Royal Holloway, University of London. It is your responsibility to ensure that this email and any attachments are virus free.
