Forum Discussion

Aspirant

Aug 02, 2016

NFS Performance issues

I work for Netapp in the NFS support area. I puchased this device almost a year ago and for the most part have been happy to have it just as a storage device. Recently I tried to put a VM on the de...

nfs

Performance

Using with a Virtual Hypervisor

Hopchen

Prodigy

Aug 03, 2016

Apart from what mdgm mentioned (definitely worth a read), can you please let us know whether you have NFS async enabled or disabled?

Go to the settings page of the share --> Network Access --> NFS --> Advanced.

This can have a very significant performance impact - running with or without async.

Thanks

SuperJT

Aspirant

Aug 04, 2016

Hi all,

Thanks for the response. I looked over the KB's listed.

1) I am running 6.5.0 (1 minor version below current i believe)

2) ASYNC is not enabled (I'll play with this to see if this improves performance)

3) Bit-Rot Protection is not enabled.

4) Snapshots are enabled, set for 'smart' for management and are set to daily.

edit:

Additional outputs:

mount options

jtownsen@superjt:~$ mount | grep vm
192.168.1.79:/data/vm_store on /var/lib/kimchi/nfs_mount/vm_store type nfs (rw,relatime,vers=3,rsize=524288,wsize=524288,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.1.79,mountvers=3,mountport=59523,mountproto=udp,local_lock=none,addr=192.168.1.79)

top.

Tasks: 212 total,   1 running, 211 sleeping,   0 stopped,   0 zombie
%Cpu(s):  0.2 us,  0.8 sy,  0.0 ni, 85.3 id, 13.7 wa,  0.0 hi,  0.1 si,  0.0 st
KiB Mem:   3931280 total,  3245088 used,   686192 free,      312 buffers
KiB Swap:  2094844 total,        0 used,  2094844 free,  1827016 cached

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND                                                                                       
 3656 root      20   0     0    0    0 D   1.7  0.0   0:23.35 nfsd                                                                                          
 1504 root      20   0     0    0    0 S   1.3  0.0  49:32.66 md127_raid5                                                                                   
 3655 root      20   0     0    0    0 S   0.7  0.0   0:12.35 nfsd                                                                                          
 1443 root       0 -20     0    0    0 S   0.3  0.0   1:28.83 kworker/2:1H                                                                                  
 2835 root       0 -20 2228m  17m 3120 S   0.3  0.5  16:10.14 vpnserver                                                                                     
 2954 root      35  15 1830m  71m 6596 S   0.3  1.9   6:21.11 Plex Script Hos                                                                               
 2957 admin     20   0 2363m 137m 5188 S   0.3  3.6  14:43.74 sabnzbd                                                                                       
 3543 admin     20   0  130m 7376 3084 S   0.3  0.2   0:02.97 apache2                                                                                       
14297 root      20   0     0    0    0 S   0.3  0.0   0:01.15 kworker/u8:5                                                                                  
14549 root      20   0     0    0    0 S   0.3  0.0   0:00.13 kworker/2:1                                                                                   
    1 root      20   0 45720 5052 2488 S   0.0  0.1   0:06.58 systemd

SuperJT

Aspirant

Aug 04, 2016

I enabled async on the volume.. Huge perf increase. 95 minutes to 4 minutes. I feel like this is indicating my disks are a problem.

root@superjt:/var/lib/kimchi/nfs_mount/vm_store# time tar xf gcc-5.3.0.tar.gz 

real	95m11.482s
user	0m9.828s
sys	0m48.948s
root@superjt:/var/lib/kimchi/nfs_mount/vm_store# rm -rf gcc-5.3.0/
root@superjt:/var/lib/kimchi/nfs_mount/vm_store# time tar xf gcc-5.3.0.tar.gz 

real	4m7.290s
user	0m8.152s
sys	0m30.148s
root@superjt:/var/lib/kimchi/nfs_mount/vm_store#