Generally pretty slow perfomance


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Hi there!

I built my first unraid server a month ago and generally I am pretty happy with the gui, features ecosystem etc. My only downside which is a pretty big one, is that the system is extremely slow and I don't know the reason for it. So hope to find the reason for my issue with your help since I don't know exactly where to start looking.

 

My System:

CPU: Ryzen 2600

MB:   Gigabyte X470 AORUS Ultra Gaming

RAM: 2 x G.Skill Aegis 8GB DDR4-3000MHz

PSU: Enermax Platimax D.F. 600W

Sata/SAS Card: Dell H200

 

Drives:

SSD: PNY CS900 480 GB (Cache)

HDD: 4 x WD80EMAZ 8TB

HDD: 3 x WD80EZAZ 8TB

with two of these as parity.

 

Docker Containers:

  • Krusader
  • jackett
  • ombi
  • plex
  • radarr
  • sonarr
  • sabnzbd
  • tautulli
  • transmission_vpn

 

Symptoms:

When I started using Unraid, everything was fine. It slowed down when I began adding Docker containers to my system. Without any containers running, I am able to copy files with full speed on it (Gbit ~110 Mb/s). But when I started to start some containers the write speeds slowed down a lot. Also the performance of the docker services is lacking, for example radarr/sonarr needs 10-20 seconds to load a single page and sometimes they can't open a page at all. The performance is the worst when sabnzbd is downloading files. Write speeds to a share drop to 0 or do not respond at all. Read speed is pretty bad as well, can't open folders in Windows explorer without crashing and skimming/playing video files is also not possible.

 

Reasons:

I really have no idea.

1. First I am not sure if such a behaviour isn't normal at all and I am just wanting to much from the system but I would have thought that my hardware should be capable to download, copy and host a webserver at the same time. Am I wrong?

2. Parity Drives. The symptoms existed before I added the two parity drives so I can rule them out.

3. Cache drive. This is my biggest guess. I added the drive later in my build and maybe I configured it badly? Every share of mine is set to use the cache disk. The 'appdata' and the 'system' share are set to only use the cache so I guess they won't be moved at night. The drive is connected to the mainboard, not the SAS card.

4. BIOS setting. Is there something I should look out for?

5. ??? Do you have more ideas which could be the reason?

 

Thanks for your help!

 

 

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Hi Henning,

 

Check this out, it sounds like the same issue that you're having: 

 

Am not poster here but I found it informative and ended up doing the same.

To mitigate this issue on my end what I ended up doing was building the array with cache drive SSD then going new config and removing the SSD setting all options on all shares beforehand to use cache=no and run mover before going new config. Now, Docker and VM's run completely independent of the array to preserve performance.

 

If/when I elect to use a cache drive it will be spinning rust not an SSD to only be used as a cache.

 

Hope that helps!

Edited by Trunkton
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On 1/6/2019 at 10:51 PM, JimL said:

Can you post a diagnostics file from when or right after the system slows down?

 

Will definetly do but can't find the time right now for it!

 

On 1/6/2019 at 11:11 PM, Trunkton said:

 

 

Check this out, it sounds like the same issue that you're having...


 

Thank you for your answer, it hinted me in a right direction. I added the cache driver after configuring the docker files. I assumed that setting the appdata share to only use the cache disk, the next mover job would move all appdata from the array to the cache. This isn't the case. I had appdata data on different array hdds and the cache disk. I suspect that only new data got written to the cache disk.

I moved everything onto the SSD now and Plex feels way snappier now. 😘
But when I start SABnzbd the system slows down again and turns sluggish, so I will search further and come back with some diagnostics.

Edited by Henning
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  • 2 weeks later...

Thanks for the answer, 

reading activity is correct but I was under the impression that writing should go to the cache drive. 

The share I was writing too has a split level set, will this setting prevent caching? 

 

Edit: oh I checked the screenshot again, I was reading from the disk so I dont know exactly what was writing to the disk. 

Edited by Henning
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