(6.8.3) Unraid randomly slows down really badly


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I have an unraid box which will randomly slow to a crawl (SMB transfers time out, webgui mostly unresponsive, dockers unreachable/time out, can't even start HTOP till system returns), top reports high load averages but low CPU usage during these times

 

Hardware

  • Intel i7-6700
  • 12 GB DDR4
  •  4x1tb internal drives (2 toshiba, 2 WD)
  • 1x 1.5tb seagate expansion 2.5 as a parity (connected via USB 3.0)
  • 1x onboard nic
  • 1x TP link gigabit PCIe NIC
  • HP x705w USB (boot)

 

 

Recent Hardware changes

  • Changed from Ryzen 3 - 1200 to intel i7-6700
  • added an external drive to use as parity drive and use parity drive as data drive
  • added second NIC (TP-Link gigabit)
  • removed graphics card

 

I have tried turning on write caching for the parity drive, it has not made much of a difference (yet, I only did this 10 minutes ago at time of writing)

 

Reddit thread

docker ps, no VMs

DMESG

Thanks

Edited by danielandastro
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USB connections are not reliable enough for disks in the parity array or cache pool. The only way I would even consider USB in the array is for a backup server with no parity disk assigned. Probably only a matter of time before parity gets disabled.

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7 minutes ago, trurl said:

USB connections are not reliable enough for disks in the parity array

If this is the reason then I am completely screwed, I don't have any more SATA ports, and since its a 1.5 TB I assume I have to replace it with the same size drive which rules out restoring the old config. Strange that it would show up now and not after adding the drive

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1 hour ago, danielandastro said:

since its a 1.5 TB I assume I have to replace it with the same size drive

Since it's parity and new config will rebuild parity anyway, it only has to be as large as the largest single data disk.

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3 minutes ago, trurl said:

new config will rebuild parity

I've ordered a Syba PCIe 1x sata card, will it work if I just shuck the drive and use the HBA or do I have to rebuild parity

Is there any way of confirming that the problem was infact the USB

Edited by danielandastro
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43 minutes ago, danielandastro said:

will it work if I just shuck the drive

Maybe but you should check parity in that case to make sure.

 

46 minutes ago, danielandastro said:

Is there any way of confirming that the problem was infact the USB

Maybe something would show up in diagnostics. In any case USB parity disk is just a problem waiting to happen in my opinion whether it is the cause or not.

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