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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 ...
The last one I did took about 30 hours - that was on an RN526 with 4x6TB installed. That was using 6.6.1 beta.
That seems like a roughly plausible speed for this to be.
So, given that i have half as much data as you do, but my scrub is projected to take roughly 2,000 hours, is it really plausible that the CPU in the RN104 is 2,000 / 15 ~ 130x slower than the one in the RN526? Doesn't seem right to me.
There's definitely a bug here.
Well one would need more info such as what services you are running, if you have any apps installed, disk SMART stats, logs zip from your system etc. before rushing to any judgments.
Nothing is running, and there's nothing wrong with the disks. I you have some ideas for logs that would be useful, I'm perfectly willing to post them up here. But all the standard culprits (AV, disk spin down, other things running, etc...) are not a factor. They are either totally off (AV, spindown), or really minimal (1 connected user, approx 0.0 kbps of activity throughout).
Also, this same thing happens if I run btrfs scrub start /data, straight from the commandline. So it's not completely limited to the readyNAS software itself, probably just part of a larger pathology within the Linux kernel. But it wasn't always this bad, it got about 10-100x worse about a year ago, presumably with one of the OS updates.
Send in the full set of logs anyway (see the Sending Logs link in my sig)
I already sent in all the logs, so you can find that information there.
Short answer, I'm not running anything, have no apps installed, etc... so it doesn't matter.
Try it yourself, get a RN104, put in 3x3TB drives, 1x2TB drive in X-RAID, put 2TB of data on it, run version 6.2.4 and do a scrub. Then, upgrade to 6.4.2 and do another scrub. See if your numbers differ by at least 10x from before and after. I'm betting that they will.
In any case, if it were the case that some minor activity on the readyNAS inflated the scrub time by 40x, that would in and of itself be a bug anyway.
I have a RN316 with 14TB :)!
I do have 3 Raid 1 arrays!
I am sorry I am reaching my limits. Try a wiser guy or NG nerds upstairs! :(!
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