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A very LONG scrub
I manually kicked off my first scrub about four hours ago. I'm running 4x4TB WDC Reds @ 5400 RPM on RAID6, resulting in a 7.27TB volume.
These are my present stats, calculated in Excel:
% Complete : 0.28%
Start : 3/8/2016 15:44:03
Current : 3/8/2016 19:40:55
Duration : 1409:52:41 [(Current-Start)/% Complete]
Completion : 5/6/2016 13:33:35
Is it reasonable to expect this job to require 2 months for completion?
This doesn't look right to me.
Thanks,
Jeff Bowman
Fairbanks, Alaska
The scrub will speed up a bit once the filesystem portion of the scrub finishes. But it'll never be "fast" using RAID6 on a RN104. RAID5 can offload some parity calculation work to a specialized engine on the CPU, but no such engine exists for RAID6 on the RN104 CPU, and RAID6 is much more computationally intensive than RAID5. You'd probably have a better experience using RAID10 on RN104.
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Which model is this on?
Which services and apps are you running?
Which firmware?> RAID5 can offload some parity calculation work to a specialized engine
> on the CPU, but no such engine exists for RAID6 on the RN104 CPU
Hi Skywalker, what about the RN204?
Thanks,
Jeff Bowman
Fairbanks, AlaskaThe RN204 has a dual-core CPU so whether or not it can offload tasks to a special engine it does have two cores to make use of. The RN214 has a quad-core CPU. Performance would be better with either of those.
The RAID itself would be limited to one core, but other things that are running on the NAS could make use of other cores minimising their impact on the scrub.
Yes, RN204 has RAID6 P+Q offloading.
> Yes, RN204 has RAID6 P+Q offloading
Excellent, thank you.
Thanks,
Jeff Bowman
Fairbanks, Alaska
So if you want to continue to use RAID-6 the choice would be to consider whether to get the RN204 or the RN214.
The RN214 is a better choice if you wish to e.g. use Plex transcoding, use the anti-virus service and/or use NIC bonding on the NAS with multiple clients accessing the NAS at the same time on a wired gigabit network.
> So if you want to continue to use RAID-6 the choice would
> be to consider whether to get the RN204 or the RN214
I guess it'll be the RN204 for now. That'll get me by until I eventually get my 516.
But this RN104 has got to go! :-)
Thanks,
Jeff Bowman
Fairbanks, Alaska
Well, it turns out my calculations were incorrect. To obtain the completion time estimate, I was adding to the current time and not the start time.
Here's the (accurate) latest:
% Complete 85.46%
Start 3/9/2016 16:51:56
Current 3/16/2016 14:18:04
Duration 193:34:57
Completion 3/17/2016 18:26:53Amazon comes through again. Assuming all goes well with shipping and pickup etc., I expect have my shiny new RN204 in my possession by then.
Does anyone know whether I'll be able to simply swap in my drives and go? Or will I instead have to build a new volume and copy all my files anew? Naturally I'm hoping for the former.
Thanks,
Jeff Bowman
Fairbanks, Alaska
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