No,im talking about special device in zfs. It can speed up garbage collection. It is always good to have them, if your zfs is 10tb or 200tb in some cases.
With those backplanes sometimes it works sometimes not. Really you need to test it with zfs. I had some 40disks backplanes work,and some not. But zfs raid10, maybe 2 nvme/ssd for caching and you're good to go.
I have one strange error:
Kernel 6.14 ,lxc with mysql on it.
/var/log/kern.log:3651:2025-04-10T10:35:40.646702+02:00 sp19 kernel: [236703.525309] audit: type=1400 audit(1744274140.640:2244): apparmor="DENIED" operation="create" class="net"...
This is okay setup for me, usually we don't have more than 4xdisks per one nvme for caching . If you need more than that we usually recommend adding more nvme caching drives. Yes, if this nvme dies, all osds which are cached on it die, but this...