Hi,
在 2024/04/13 1:35, Tom Crane 写道:
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.
No, IO fast path is not involved with the daemon thread. Daemon thread
is used to handle IO errer, sync IO, update sb, handle spares...
Thanks,
Kuai
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.
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