Ask The Experts

Slow NFS Performance ubuntu



im trying to understand whats is going on on my infrastructure


i have a AFF200 with 960gb(10) and linked on tengigabit ethernet for the nfs lif

when im run a test i got this value and is very hard to pass over 230 300mbps over a tengigabit


1 (f=0): [f(1)][100.0%][r=142MiB/s,w=0KiB/s][r=36.4k,w=0 IOPS][eta 00m:00s]


i check the network throughput on the filler side and is not reaching 10gbit

Iperf3 between netapp and node show 9.5gbit


notes: using ubuntu 18.04

mount options:rw,relatime,vers=3,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=,mountvers=3,mountport=635,mountproto=udp,local_lock=none,addr= 




the real symtom is some vms start getting high "Waiting for I/O"  and when i go to the node and trying to perform ls to the mountpoint the computer freeze arround 3 4 5 seconds to perform a list of 60 files


something that i do is create another lif with a different ip/port and remount to another mount point . when the issue happend on the normal mount point if i try to list to the second mount point works great


what i can check in this case?





It sounds like the only difference between the good and bad setups are the physical path the connection traverses. I would recommend looking at the ifstat counters on the two different ports. Packet loss can have a profound impact on TCP performance due to congestion control algorithms. A packet trace collected against the bad port would be allow you to rule in/out the network. 

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