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[SOLVED] [6.6.7] New installation, very low parity build speed.

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Posted (edited)

Hi all,


I have a very low parity build speed.  Might be because my disks are trash, I'm not an expert, I tend to buy what I can.  Or possibly the motherboard is trash.


All dockers and applications have been stopped except for the DiskSpeed plugin.  (And to those of you who make these incredible plugins, You.  Are.  Gods.)


Details of the parity build:

Total size:  10 TB

Elapsed time:  23 hours, 40 minutes

Current position:  3.79 TB (37.9 %)

Estimated speed:  25.1 MB/sec

Estimated finish:  2 days, 20 hours, 39 minutes


Motherboard: ASUSTeK Computer INC. - M5A78L-M/USB3 (https://www.asus.com/us/Motherboards/M5A78LMUSB3/specifications/)

CPU: AMD FX™-6300 Six-Core @ 3500

Memory: 32 GB

Network: eth0: 1000 Mb/s, full duplex, mtu 1500

Slots:  PCIe x1, PCIe x16

SATA Controller:  ASM1062 Serial ATA Controller (http://www.asmedia.com.tw/eng/e_show_products.php?cate_index=117&item=151)

SATA Controller:   [AMD/ATI] SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode]




sdh (disk 2) and sdi (disk 3) are Seagate Ironwolf Barracuda drives, 7200 RPM, 10TB.  But their benchmark speed in the Diskspeed Plugin is crap.  Is that because the parity rebuild is occurring at the same time?  (I'm hoping.)  These are both attached to the ASM1062 SATA card (and signaling 6Gbps.)




The rest are connected to the onboard SATA (which is in AHCI mode, at least):




I have set the tunables for larger arrays as instructed in other posts in the forum:




The rest of the drive details:




The two blank 10TB drives are shucked from WD External Drives (https://smile.amazon.com/gp/product/B07G3QMPB5/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1; they were $149.99 each.)


Help? :)


Please let me know if there's any additional information I can give you to help figuring this out.




Side note:  I updated the BIOS on the motherboard to the 2101 revision and that resolved an issue I was having where the box would completely shut down on me, in case anyone else has an M5A78L and running into that problem.


Edited by Talonius
Made links, links.

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12 minutes ago, Talonius said:

But their benchmark speed in the Diskspeed Plugin is crap.  Is that because the parity rebuild is occurring at the same time?

Yes. How could it be otherwise?

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6 minutes ago, trurl said:

Yes. How could it be otherwise?

Magic?  Little fairy dust, frog tongue, mushroom caps, throw it at a pixie and wallah, you've got a magic controller which can take disks offline from unRAID long enough to benchmark 'em.  (OK, OK, I admit I was figuring stuff out as I posted the message.  It's like talking to a duck.  Until you explain it to the duck, it's just not clear.)


4 minutes ago, johnnie.black said:

In the screenshot you are also writing to disk5, this will slow down the sync considerably.



So... excuse me while I go sit in the corner.  Thank you gentlemen.  I apologize for wasting your time.



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2 hours ago, Talonius said:

Thank you gentlemen.  I apologize for wasting your time.

Questions are good. I would much rather answer a question than try to figure out what mistaken action the user has taken on their own without seeking advice.

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In case anyone doubts that the Mover (or drive access, period) was responsible for this problem I'm now sitting at 148.4Mb/sec parity build speed.  Which is from the GUI, but... heh.

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