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Re: Ready NAS Ultra 4 plus slow write speed

Vez
Aspirant
Aspirant

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 timeouts on teamed NIC", but this I feel this is still prevalent.

 

Everything was fine prior to upgrading to 6.9.0

 

Thanks in advance 🙂

Model: ReadyNAS RNDU2000|ReadyNAS Ultra 2 Chassis only
Message 1 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed

Is the PC using wireless or ethernet?  You say "100 mbps" - do you really mean megabytes per second?

 

If you are using bonding, the try testing without the bond.  Also, if you are using jumbo frames, try disabling them.

 

Also, if you are using a Windows PC, can you try testing with NAStester?  http://www.808.dk/?code-csharp-nas-performance

 

 

Message 2 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

NAS performance tester 1.7 http://www.808.dk/?nastester
Running warmup...
Running a 400MB file write on X: 5 times...
Iteration 1: 9.91 MB/sec
Iteration 2: 7.56 MB/sec
Iteration 3: 9.28 MB/sec
Iteration 4: 54.40 MB/sec
Iteration 5: 19.33 MB/sec
-----------------------------
Average (W): 20.09 MB/sec
-----------------------------
Running a 400MB file read on X: 5 times...
Iteration 1: 97.96 MB/sec
Iteration 2: 104.32 MB/sec
Iteration 3: 98.37 MB/sec

 

As said previously with Teaming enabled on the switch and NAS it has worked flawlessly until 6.9.0.  I will get an "unteamed" to follow.

 

and yes I did mean 100MBs.

Message 3 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

Okay, looks as though I hadn't set the teaming back to mode 3+4 (which is was prior to 6.9.0) - set to 2+3 as this gave the best performance on 6.9.0.

 

I have now changed it back to 3+4 on 6.9.1 (prior to single NIC testing), and everything now seems to be normal with regard write speed 🙂

 

Thanks for your assistance 🙂  (presently writing a 10gb file near on 100MBs - which I wasnt able to do this morning).

Message 4 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

Right further more, I did a quick test this morning and the expected behavour of the fault appears to be back, strange how it was fine after switching mode but non the less, for example, here is the file transfer from a test file:

 

Transfertest.png

 

Starts off fine then drop to single digits as per earlier post.  I will have to get a test done where it isn't using a teamed NIC.

 

Message 5 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

and one without the Bond, this suggests that the bonding issue puported fixed in 6.9.1 still has issues.Transfertestwithoutbond.png

 

I will also get similar NAS test results as per request.

Message 6 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

Without Bond:

 

NAS performance tester 1.7 http://www.808.dk/?nastester
Running warmup...
Running a 400MB file write on X: 5 times...
Iteration 1: 66.31 MB/sec
Iteration 2: 73.69 MB/sec
Iteration 3: 68.17 MB/sec
Iteration 4: 67.21 MB/sec
Iteration 5: 52.35 MB/sec
-----------------------------
Average (W): 65.55 MB/sec
-----------------------------
Running a 400MB file read on X: 5 times...
Iteration 1: 106.29 MB/sec
Iteration 2: 106.77 MB/sec
Iteration 3: 107.09 MB/sec
Iteration 4: 108.34 MB/sec
Iteration 5: 107.26 MB/sec
-----------------------------
Average (R): 107.15 MB/sec
-----------------------------

Message 7 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

And from the bonded session:

 

 

Running warmup...
Running a 400MB file write on X: 5 times...
Iteration 1: 64.32 MB/sec
Iteration 2: 65.26 MB/sec
Iteration 3: 25.80 MB/sec
Iteration 4: 30.66 MB/sec
Iteration 5: 35.92 MB/sec
-----------------------------
Average (W): 44.39 MB/sec
-----------------------------
Running a 400MB file read on X: 5 times...
Iteration 1: 94.29 MB/sec
Iteration 2: 106.97 MB/sec
Iteration 3: 105.40 MB/sec
Iteration 4: 109.04 MB/sec
Iteration 5: 106.46 MB/sec
-----------------------------
Average (R): 104.43 MB/sec
-----------------------------

Message 8 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed

Can you also run a test using a local folder on the PC as the destination?  Just to rule out any possibility of a bottleneck there?

Message 9 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

localtest.pngHad to get a bigger file!

Message 10 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed

So it's certainly not limited by the local PC's disk.

 

Does the desktop PC also have a wifi NIC?  If so, make sure it is disabled.

 

Also, is AntiVirus enabled on the NAS?

Message 11 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

No wifi on PC, and no indexing or Antivirus on NAS

Message 12 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed

Are you seeing any packet loss in the NAS ethernet stats?

Message 13 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

bond0 Link encap:Ethernet HWaddr a0:21:b7:c1:1d:f6
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1
RX packets:21856120 errors:0 dropped:1420 overruns:0 frame:0
TX packets:18489647 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:28919351418 (26.9 GiB) TX bytes:21478302669 (20.0 GiB)

eth0 Link encap:Ethernet HWaddr a0:21:b7:c1:1d:f6
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:121466626 errors:0 dropped:374 overruns:0 frame:0
TX packets:108389037 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:127036580851 (118.3 GiB) TX bytes:112066603761 (104.3 GiB)
Interrupt:87 Memory:feadc000-0

eth1 Link encap:Ethernet HWaddr a0:21:b7:c1:1d:f6
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:211877416 errors:1222 dropped:3747 overruns:0 frame:1222
TX packets:138718284 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:254748327591 (237.2 GiB) TX bytes:100769173497 (93.8 GiB)
Interrupt:88 Memory:febdc000-0

Message 14 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed

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

Message 15 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

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.

 

Message 16 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed


@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.

Message 17 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

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.

Message 18 of 21
StephenB
Guru

Re: Ready NAS Ultra 4 plus slow write speed


@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.

Message 19 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

Right strange this....

 

Post cable swap (as in same cables on different NAS ports, the behaviour has dissapeared:

 

post cable swap bonded.png

I will in the course of the weekend swap the cables back and do another test.....

Message 20 of 21
Vez
Aspirant
Aspirant

Re: Ready NAS Ultra 4 plus slow write speed

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.

 

 

Message 21 of 21
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