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NFS UDP traffic intermittently drops after upgrade to ONTAP 9.2 or newer

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Category:
ontap-9
Specialty:
network
Last Updated:

Applies to

  • ONTAP 9.2 and later

Issue

  • Mostly the issue is found after ONTAP is upgraded to 9.2 or later, the filer does not reply to every ICMP (ping) request even if it can be found in a packet trace.
  • This is occurring on every interface on the cluster and even on e0M interface.
  • A strange behavior could be related to multiple LIFs on the same port not responding at different times.

     

  • This issue is affecting the NFS data transfer also if UDP is used as a transport layer causing a huge delay

      This can be confirmed by following simple test:

        Situation1# Mounted with UDP

[root@centos-04 /]# mount -t nfs -o vers=3,proto=udp 10.128.242.45:/vol1_svm2  /mnt/vol1_svm2_ontap93
[root@centos-04 /]# cd  /mnt/vol1_svm2_ontap93
[root@centos-04 vol1_svm2_ontap93]# dd if=/dev/zero of=./test bs=4096 count=10000
10000 0 records in
10000 0 records out
40960000 bytes (41 MB) copied, 37.0209 s, 1.1 MB/s  <<<

         Situation2# Mounted with TCP

[root@centos-04 vol1_svm2_ontap93]# cd /
[root@centos-04 /]# umount /mnt/vol1_svm2_ontap93
[root@centos-04 /]# mount -t nfs -o vers=3,proto=tcp 10.128.242.45:/vol1_svm2 /mnt/vol1_svm2_ontap93
[root@centos-04 /]# cd  /mnt/vol1_svm2_ontap93
[root@centos-04 vol1_svm2_ontap93]# dd if=/dev/zero of=./test bs=4096 count=10000
10000 0 records in
10000 0 records out
40960000 bytes (41 MB) copied, 0.240958 s, 170 MB/s <<<

 

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