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Forum Discussion
Average transfer speed (read and write) plummeted after replacing hard drives
Hello everyone
TL;DR: I just replaced my 3TB hard drive with some brand new 8TB hard drive, and the average speed plummeted, from 70MB (switch 1)/100MB (switch 2) to a steady (but slow) 40MB on bot...
HiEstivalG
A RN102 NAS is the entry level NAS. I am actually surprised that you got 70MB/s + speed before. I had one a while ago for testing various things but I would typically be in the range of 30-50MB/s and that was with a 2TB RAID 1.
Expanding the volume size to 8TB is going to take more processing for the single core ARM CPU and 500MB of ram, housed in the NAS. It is not really unexpected that the speeds are going to drop as a result.
You can of course try to factory default the unit in order to get a clean filesystem. However, with 8TB you are probably starting to hit the upper limit of what the unit can realistically handle.
Perhaps it is time to upgrade NAS since it seems your data needs have increased? I reckon that if you monitor the NAS via top command (or similar) while transferring data you will probably see the unit being flat out.
Hi Hopchen
I was quite happy with a 70MB/s speed, but it seems that the speed is very dependant of:
_The computer. My previous desktop topped at 50MB/s
_The switch. With a less than 2 years gaming laptop and a new switch, I got 100MB/s with a big file.
I never monitored the unit through top before, and I now got a 70-80% system cpu usage (read or write), which is HUGE. I don't remember such a high system usage, even in my earliest linux days (in the 20th century!! Ho, my!)
Since the only option left is to rebuild a new array, I will try a JBOD setup first, as StephenB suggested, and check for the system usage, and see if the transfer speed is better.
And I will post here the results in a few weeks.
edit: Just tried a direct write:
dd bs=1M count=2048 if=/dev/zero of=test2
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB, 2.0 GiB) copied, 35.0169 s, 61.3 MB/s
No I/O wait (wa stays at 0.0%) but a 90% system cpu usage. I think JBOD setup will be better but I guess that RAID1 configuration will be quite slow, I will check if disabled XRAID is better.
Thank you everyone ;)
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