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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 ...
glad to hear that the situation evolve!!
Disk is swapped, rebuild and reshape are done. Then I ran the scrub, and here's what I've got.
root@readyNAS:~# btrfs scrub status /data
scrub status for bfb437e8-16ee-444c-b4c8-48cee4f845e1
scrub started at Sat Feb 25 01:37:29 2017, running for 07:34:32
total bytes scrubbed: 60.08GiB with 0 errors
That's about 10 GB/hour. To do the whole ~4TB of data would therefore take roughly 400 hours, or about 20 days. This is pretty much the same as before.
This result isn't surprising, since we know it's not a hardware problem, because it was introdued by a software update.
Is there anyone at Netgear who can attempt to fix this bug?
It's a hell of a mess you are into!!!!
Good luck and patience!!
Cheers!
Yeah, thanks.
The problem isn't devastating, because the NAS works just fine in every other way. I can even literally read every byte off it, and thus accomplish the scrub, in a reasonable amount of time. It's just the scrub functionality itself that is totally broken.
I guess let's see if Netgear tries to figure out a fix.
joey123you are learning the hard way and learning fast!!!!
In front of those kinds of mess I fell like a complete moron (excuse my French and I am a Frog as you noticed the way I slaughter the Cheakspear language!):)!!!
joey123 wrote:
root@readyNAS:~# btrfs scrub status /data
scrub status for bfb437e8-16ee-444c-b4c8-48cee4f845e1
scrub started at Sat Feb 25 01:37:29 2017, running for 07:34:32
total bytes scrubbed: 60.08GiB with 0 errors
That's about 10 GB/hour. To do the whole ~4TB of data would therefore take roughly 400 hours, or about 20 days. This is pretty much the same as before.
FWIW I just did a scrub on an RN52x NAS with 3x8TB disks in RAID-5. The volume has about 8.5 TiB of data on it. It was run from the web ui, so it was the btrfs scrub + raid scrub combination. The disks are all WD80EFZX.
The scrub took 31 hours. I didn't check CPU utilitization while it was running though.
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