Comment on Apparent issues with ZFS on RPi 5
3dcadmin@lemmy.relayeasy.com 15 hours ago
A Pi with a hat and 5 sata drives isn’t ever going to perform very well with zfs in raid z1. cpu limited, io limited possibly even ram limited quite quickly. I love zfs but it a bit of a performance hog, though pretty bulletproof if setup correctly! the hat will be through a pci x1 interface, so at least set the pci to gen3 speeds. Jeff tells you about it here
jeffgeerling.com/…/forcing-pci-express-gen-30-spe…
ramenshaman@lemmy.world 14 hours ago
People keep saying the Pi is CPU limited but it hasn’t gotten over 10% between all 4 cores while I’ve been transferring files. 16GB of RAM doesn’t seem very limited to me either. Thanks for the link!
HiTekRedNek@lemmy.world 12 hours ago
It’s bus limited, not necessarily CPU limited.
3dcadmin@lemmy.relayeasy.com 13 hours ago
It isn’t that limited, but for zfs arm seems to perform much worse. Plus you often don’t get a full idea of true system load. the biggest limitation is the io, it is very bad for 5 drives in zfs raidz1. the data is distributed across all 5 drives with parity as well. the pi can only do around 500 meg transfers for an nvme drive whilst many other platforms will see 3000 meg, that is why it suffers so much in this case as that 500 meg is across 5 drives. tops you’d get is 10 meg transfer I reckon and that is roughly what you are seeing. you’d be better off with 3 larger drives in raidz1