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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 ...
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.
Hi joey123,
Your WD disk's Load Cycle Count has been 1,462,660. Actually Western Digital rates their Green drives for 300,000 cycles. Please check this page: S.M.A.R.T. So please replace this disk. WD Green drives are designed to unload heads often to conserve power. The LCC would be increased very fast when using in storage. We don't advise to use all WD Green drives in our NAS because of this.
And I saw you enabled the data checksum(on Volumes page). Actually we disable this option for all arm based NAS boxes by default because it would affect the performance.
Thanks,
-Leia
"1,462,660" isn't it a glitch in smart?
It would make a restart every minute and a halh in 526 days running! Doing some maths!
For me there is a glitch or an error!
The number is right. The greens park after 8 seconds of inactivity, so this is about what is expected.
However, it's still not the cause of the issues. I agree with the parent that eventually I need to get rid of that drive and replace it with another. However, for now, it's not reporting any errors, and when I read data off it, it's perfectly fast. It's only the scrub that's slow.
aalexandrebeta wrote:
"1,462,660" isn't it a glitch in smart?
The number isn't out of the ballpark. The heads park themselves after 8 seconds when not in use. He's seeing about 1 head-park every 75 seconds, which is high but not impossible.
I've been using WD20EARS for years in my NV+, they have counts around 800K (over 50K hours of service). I have healthy disks in a PC which do have 1.5M or more. So although Leia is right on the 300K spec, in my experience there's no need to replace a disk if the only concern is the load cycle count.
While you can change the threshold with widdle3, it's a bit late to worry aboout that now. I'd just it it run to failure, and then replace with with a NAS-purposed drive.
In my experience, whenever a nas starts running slow or doing odd things, its the pre-cursor to a failed drive.
If I were you, I would definately aquire a replacement drive as soon as possible.
Even if it doesn't fail right away, having a spare drive on hand will minimize the amount of time your device spends non-redundant.
Also, please understand that scrubbing checks through every sector of data every time, while defrag and balance only touch the files/extents that need to be, which is why they can be much faster.
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