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Forum Discussion
Ready NAS Ultra 4 plus slow write speed
My write speed from my PC is extremely slow, it appears to start off at the expected 100mbps per second, and then drops to single digits within seconds..... I read that 6.9.1 fixed "interface tim...
RX packets: dropped:1420
RX packets: dropped:374
RX packets: errors:1222 dropped:3747
Though the percentage is low, there likely is a clue here - especially since we see a sharp increase on the errors+drops on the slave interface between the first and second test. TCP (used by SMB) presumes that errors are the result of congestion, and it will sharply back off the data rate whenever it sees link errors. Then it slowly builds the rate again (until it sees another error).
It looks like flow control might not be enabled on the switch/router (at least that's the simplest explanation for the drops). The errors are another matter. Perhaps try a different cable on the slave interface
Flow control is enabled on the GS110TP. The switch isnt seeing an TX or RX errors associated with the 2 ports.
I will swap the cables over to see if the fault follows the cable after restarting the NAS and doing a few tests.
Vez wrote:
The switch isnt seeing an TX or RX errors associated with the 2 ports.
In the case of RX drops, it won't see errors. The NAS is receiving the packets, but the software isn't keeping up with the traffic flow. So the NAS ethernet driver is dropping received packets because it has run out of buffering. Flow control is supposed to solve that, it's odd that it isn't.
Is the source PC using a single NIC? Or are you using bonding there also?
Assuming the cable change doesn't help: Although Netgear really discourages it, you could try downgrading the NAS to 6.9.0 and seeing if the speeds revert to normal. I've seen a couple posts here reporting successful downgrades from 6.9.1 to 6.9.0.
So if the switch isnt seeing any faults, then highly unlikley to be a cable fault, as you say the NAS is running out of buffer.......
Source PC is a single NIC.
This issue started with 6.9.0 and 6.9.1 hasnt resolved it.
Vez wrote:
So if the switch isnt seeing any faults, then highly unlikley to be a cable fault, as you say the NAS is running out of buffer.......
The 1222 frame errors on the slave interface are physical layer, and the cable could be responsible for those. I don't think the switch would see them as errors.
Right strange this....
Post cable swap (as in same cables on different NAS ports, the behaviour has dissapeared:
I will in the course of the weekend swap the cables back and do another test.....
Okay so this problem still exists, and I can confirm it is NOT a problem with the switch or the cables, as I now have a new NAS which runs happily with the following results.
unning warmup...
Running a 400MB file write on Z: 5 times...
Iteration 1: 101.39 MB/sec
Iteration 2: 106.69 MB/sec
Iteration 3: 113.47 MB/sec
Iteration 4: 113.08 MB/sec
Iteration 5: 110.52 MB/sec
-----------------------------
Average (W): 109.03 MB/sec
-----------------------------
Running a 400MB file read on Z: 5 times...
Iteration 1: 110.22 MB/sec
Iteration 2: 107.32 MB/sec
Iteration 3: 110.28 MB/sec
Iteration 4: 110.10 MB/sec
Iteration 5: 107.81 MB/sec
-----------------------------
Average (R): 109.14 MB/sec
-----------------------------As stated the issue of dropping speeds on file transfer, this is since a certain firmware (see above), where the NAS interfaces drop to single figure MBs.
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