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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 ...
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.
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! :(!
Quite a collection.
Thanks for your help. I think this is going to need someone from netgear to debug it. I'm a fairly astute engineer myself, and I'm fairly convinced it's a software problem. Nothing else makes any sense. For instance, I can actually read the 2TB contents of the disks off, and hash all the data, in much less time (~5%) than it takes to scrub. So any sort of hardware issue, or just generally bad performance of the unit would have showed up there. Similarly defrags and rebalances work fine, and scrub did work fine in the past, before a firmware upgrade, but now they don't. If the difference was 2x or so, I'd just write it off, but it's more like 40x, way too much to be explained by anything other than a bug.
Everything points to some sort of horrible performance bug introduced between 6.2.4 and 6.4.2 that badly broke scrubs on the RN104, at least in some configurations. Presumably this would have also gotten the RN204 and RN214, since they aren't that different in terms of hardware. But again, it may need a specific layout in order to trigger...
Good luck with your issue!
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