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Apparent issues with ZFS on RPi 5 (lemmy.world)

submitted 4 days ago* (last edited 4 days ago) by ramenshaman@lemmy.world to c/selfhosted@lemmy.world

27 comments fedilink hide all child comments

I tried to find a more applicable community to post this to but didn't find anything.

I recently set up a NAS/server on a Raspberry Pi 5 running Raspberry Pi OS (see my last post) and since then I've got everything installed into a 3D printed enclosure and I've got RAID set up (ZFS RAIDz1). Prior to setting up RAID, I could transfer files to/from the NAS at around 200MB/s, but now that RAID is seemingly working things are transferring at around 28-30 MB/s. I did a couple searches and found someone suggesting to disable sync ($ sudo zfs set sync=disabled zfspool). I tried that and it doesn't seem to have had any effect. Any suggestions are welcome but keep in mind that I barely know what I'm doing.

Edit: When I look at the SATA hat, the LEDs indicate that the drives are being written to for less than half a second and then there's a break of about 4 seconds where there's no writing going on.

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[–] ramenshaman@lemmy.world 1 points 4 days ago* (last edited 4 days ago) (2 children)

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 while making a large transfer from my desktop to the NAS.

[–] Lemmchen@feddit.org 3 points 3 days 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)

[–] calamityjanitor@lemmy.world 2 points 4 days ago* (last edited 3 days 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.