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Comment on Apparent issues with ZFS on RPi 5

I haven’t seen more than maybe 32MB/s. The transfers I’ve done are all on my local network from my desktop to my NAS which is plugged into my router. I have samba installed, my NAS shows up as a network drive just fine and I’ve just been dragging/dropping on my desktop GUI. Before setting up RAID, when I did this I would get around 200MB/s. The Pi has 16GB of RAM and I’m using less than 1.5GB.

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Lemmchen@feddit.org ⁨3⁩ ⁨weeks⁩ ago
Those 200MB/s probably weren’t synchronous transfers. The OS tells you the write was complete, but it actually hasn’t committed the data to disk yet. (Wild guess)

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calamityjanitor@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
Ah kay, definitely not a RAM size problem then.

iostat -x 5 Will print out per drive stats every 5 seconds. The first output is an average since boot. Check all of the drives have similar values while performing a write. Might be one drive is having problems and slows everything down, hopefully unlikely if they are brand new drives.

zpool iostat -w Will print out a latency histogram. Check if any have a lot above 1s and if it’s in the disk or sync queues. Here’s mine with 4 HDDs in z1 working fairly happily for comparison: Here’s mine with 4 HDDs in z1 working fairly happily for comparison

The init_on_alloc=0 kernel flag I mentioned below might still be worth trying.

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