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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 ...
Yes, let me reproduce this issue locally.
And could you please answer me some questions?
1. You just ran a BTRFS scrub only? How did you do that? Or you ran RAID scrub and BTRFS scrub at the same time?
2. I checked your logs. There was 7.3TB capacity in all. And 3.9TB used. Was this the same situation you ran scrub last time?
3. What kind of files in your box? Large movie files, or documents, music files that > 1MB and < 20MB? Or large number of small files < 1MB?
Thank you,
-Leia
1) From the commandline, run "btrfs scrub start /<pathToBtrfsVolume>", and this will start a scrub. In my case, it's "btrfs scrub start /data/", you can check on the status of it with "btrfs scrub status /data/". This will run a BTRFS scrub only, no RAID scrub.
2) This is roughly the same as the situation last time. Previously it was perhaps slightly less used space (~3TB), but as the time difference is approx 10x, I don't think the minor difference in data size is a factor.
3) Roughly 1TB is .sparsebundle files, where each physical underlying file is roughly 8MB in size, but this was always the case, even when the scrub was fast. Other than that, it's largely a handful of very large zip files and disk images, many of them several GB each. So I'd say the files are tending towards larger sizes, probably averaging 10-100 MB in size.
Try to run the btrfs scrub from the command line, and let me know what you see. It would be very interesting to see what sort of performance you get out of it.
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