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Forum Discussion
BTRFS scrub speed is insanely slow.
So I have a RN104, with about 10TB of disk space. When I set it to do a BTRFS scrub, the speed is horrific. I'm getting something like 30GB/hour of scrub speed. At the present rate, it would take ...
When you schedule/run SCRUB from the UI, it runs both a scrub on the RAID as well as a btrfs scrub. 2x the load.
RN100 series devices are single core, low powered CPU devices. They take quite some time to accomplish tasks compared to other units.
All true, but this doesn't come close to explaining the phenomenon.
a) It worked well in the past (ran in 1-2 days)
b) I can read and verify all the data on the disk using commandline tools on the NAS itself in 1-2 days.
So the issue isn't related to CPU speed as that hasn't changed, and in any case would slow down other operations on the NAS as well. Also, it can explain maybe a 2x difference in speed. If the difference was only 2x, I would never have even mentioned it, but the difference is more like 20x, and it came around once an updated version of the OS was installed.
It's definitely a software bug that needs to be fixed.
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