I have a big problem regarding my write speeds. Even disk to disk in shell without network usage it is below 2 MB/s.  Read spead over network is 120 MB/s. Read spead without network is around 180 MB/s. Parity check speed is around 160 MB/s. I have attached a zip with info regarding my system, syslog, hdparm info, speed and smart tests. I hope someone with more knowledge has an idea whats wrong.

 

I was on RC11 with a lot of plugins installed, but for the tests I removed the plugins and upgraded to RC12a. It did not help however.

 

SlrG

unraid_hdd_problem.zip

I have attached a zip with info regarding my system, syslog, hdparm info, speed and smart tests.

You did not attach anything.

Have now.

The syslog is 83 seconds long. The server runs perfectly for those 83 seconds. The log needs to include a period when the problem occurs. Collect a syslog after writing for 15 or 20 minutes.  Select the 4G RAM option at startup as a test.

Okay. I'll do both and attach the results. Thank you very much for having a look at my problem.

With 4G-RAM option the write speeds are way better. 120 MB/s from disk to cache drive and 60 MB/s from cache to parity protected disk. So that solves my speed problem.

 

But I would really like to keep the RAM in the machine and make it work without the 4G-RAM option if possible. I want to run some virtual machines on my unraid and those need the memory. I tried to google around, but I have not yet found further info where the problem is and how it could be resolved.

 

SlrG

After googling around some more, I found this is a known problem, which will hopefully be resolved later on. I'll make the 4G option permanent for now and mark the thread as solved.