Copying large amounts of data to ReadyNas 214 starts at 100MB/s +/- and drops to 15MB/s +/-

Hello all

I have a ReadyNas with (at the moment) one 5TB WD Red NAS Drive installed.

Yesterday I copied approximately 100GB of Data to it and the transfer started well at over 100MB/s, however, after a while the transfer speed dropped to 15MB/s and stayed there for the duration of the copy.

I have IPv6 Disabled on the ReadyNas and also the Virus Checker is Disabled.

The ReadyNas is running OS 6.6.0.

The PC I was copying from is running Windows 10 x64 and is connected to the Network via Gigabit as is the ReadyNas, both connected via a Netgear GS108Tv2 Switch.

I have copied the section from the Network Setting Log for the Network Port that is attached below:

eth1   Link encap:Ethernet HWaddr a0:63:91:9c:1a:11
          inet addr:192.168.1.90 Bcast:192.168.1.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:9000 Metric:1
          RX packets:327752784 errors:0 dropped:163743 overruns:0 frame:100457
          TX packets:296738965 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1381342327 (1.2 GiB) TX bytes:4141565492 (3.8 GiB)

As you can see there is a very large number of Dropped Packets and Frames, however, when looking at the GS108Tv2 Stats no Dropped Packet Errors are shown, or any Errors for that matter between the ReadyNas and the PC.

Does anyone have any ideas why this is happening?

Thanks in advance

Kevin

Performance

StephenB
Dec 24, 2016
kncowans wrote:

I received a reply from Skywalker and he accessed my ReadyNas remotely and unfortunately confirmed that the Eth0 had failed (hung) and said I needed to contact Support to arrange an RMA.

thx for the update - it's good that he was able to diagnose it.

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StephenB
Guru - Experienced User
Dec 21, 2016
kncowans wrote:

RX packets:327752784 errors:0 dropped:163743 overruns:0 frame:100457

First of all, the dropped packets were delivered, so the GS108T has no way of knowing that the NAS didn't process them.

Are Jumbo Frames enabled anywhere on the network? If so, double-check the MTU you are using.

The frame errors are probably the place to start - they usually are ethernet packets that had a bad CRC checksum. That suggests a problem with the link between the switch and the NAS. Try a different cable first, then move the cable to a different switch port on both the GS108T and the RN214.

Also, enable ethernet flow control on the GS108T.
- kncowans
  Virtuoso
  Dec 21, 2016
  Hello Stephen
  
  Thanks for the reply.
  
  I have put my answers below:
  
  Are Jumbo Frames enabled anywhere on the network? If so, double-check the MTU you are using.
  
  Yes, 9K Jumbo Frames are Enabled on the PCs, Switch and ReadyNas.
  
  The frame errors are probably the place to start - they usually are ethernet packets that had a bad CRC checksum. That suggests a problem with the link between the switch and the NAS. Try a different cable first, then move the cable to a different
  switch port on both the GS108T and the RN214.
  
  I have tried multiple cables and also different Ports on the GS108Tv2, I have even tried a different Switch with no improvement.
  
  Is there anyway to zero out the Network Settings Log so that I can get a better idea of what is happening?
  
  Also, enable ethernet flow control on the GS108T.
  
  Flow Control is Enabled on the GS108Tv2.
  
  As I mentioned in a previous discussion with you concerning Teaming, the Eth0 Port is showing as Not Active, even when a cable is plugged in (as shown below) to which you replied that there is a known issue with Lan Teaming on 6.6.0. Hopefully this issue will be resolved in the next Firmware.
  
  Because of this I am unfortunately not able to try connecting a Lan Cable to Eth0.
  
  Thanks in advance
  
  Kevin
  - StephenB
    Guru - Experienced User
    Dec 21, 2016
    kncowans wrote:
    
    Is there anyway to zero out the Network Settings Log so that I can get a better idea of what is happening?
    
    A reboot should do it. Though it's tedious you can download before and after a test, and subtract. Or get the stats via ssh (ifconfig).
    
    kncowans wrote:
    
    Because of this I am unfortunately not able to try connecting a Lan Cable to Eth0.
    
    That is annoying, and unfortunately not in the changelog for 6.6.1 beta. Hopefully they will fix it in beta 4. Maybe try pming skywalker or kohdee and see if there is a manual way to resolve it.
    
    It's possible that the RN214 NIC is simply failing, and you need an RMA.
    
    You could try turning JF off on the data source and the RN214 and see if that changes anything. No need to change the switch settings.
    
    Also, if you still have LACP configured on the switch - The switch has different settings for MTU, one for the link, and a second one for the bond. The one for the bond is a bit hard to find. Though the bond won't set up with only one cable, it might be prudent to check with a switch port that isn't part of the bond configuration,
    
    Or just confirm the MTU on the path to the NAS, using ping on the PC.

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Copying large amounts of data to ReadyNas 214 starts at 100MB/s +/- and drops to 15MB/s +/-

8 Replies

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