The first i used is an old Kingston with 32GB of space, and the other one is a Samsung 860 QVO 1TB
Anyway do you think I can do something about the problem? I don't have other disks to test
I think is not a issue of the drives, but a software issue or a misconfigurationa 1TB QVO should be able to handle those writes for much longer before buckling.
I haven't tried but I'm 100% sure that isn't a network issue, when the speeds are normal a transfer saturates the server link (Which is a 1Gbit)Have you tried running iperf to check the raw network bandwidth?
@Pietroos Have you done any testing directly on the pool (the one with the 1TB SSD) or has it all been via the network?
I have done the tests only via network, but as I said in previous posts, I don't think is a network issue. I have also done some Iperf tests and and all the results saturate the bandwidth available
Have you tried making a pool with just your 860 SSD, and then running transfers to/from that, to eliminate the shingled drives as a factor?
If it's not the network, doing some local testing on your pool would let you verify that your disks are performing as expected.
all disks I tried are pretty new and can support more than 100MB/s of writing speed
Unfortunately, I think what's going on is your disks actually can't sustain 100MB/s. You have so little RAM, you're using swap on your drives at the same time as the transfer. When your shingled drives start remapping sectors, your write performance for both swap and data transfers sinks to almost nothing.
You'll need to:
- Add RAM
- Switch to drives that aren't SMR.
What power settings do you have? Does it change clock speed when idle?
I let my CPU run at base clock all the time and just let core park do it's job. I sacrifice some 5W maybe but it's a lot snappier.
Wonder if your CPU get stuck at 200MHz or something and stay there.
A Samsung 860 QVO 1TB drive will NEVER do 1000MB/sec. Nor does SATA-3 support that speed. At best, an 860 QVO does a little over 500MB/sec until its cache fills, after which it drops to around 80MB/sec. That's less than 1/12 of what you seem to be expecting out of this drive.Pietroos said:And you can't tell me that a samsung qvo does not hold 1000MB/s and needs to go at 1MB/s