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DF and LS commands to NFS mount point are very slow due to failing SFP module

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fas-systems
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nas
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Applies to

ONTAP 9

Issue

  • df -h and ls command hang 10 seconds or 7 minutes.
  • NFS client is reporting nfs: server <storage_ip> not responding, still trying message.
  • From TCPDUMP, it looks like the storage system is delaying to send all NFS response packets(i.e. V3 Write Reply, V3 GETATTR Reply, V3 FSSTAT Reply, READDIRPLUS Reply).

Example:

2140       2021-12-21 16:30:31.305022           0.035760               Client_IP        Storage_IP          852         2049       579664231                1393168162         579664363           210         132         NFS         V3 FSSTAT Call (Reply In 3209), FH: 0xd16298da

3209       2021-12-21 16:30:33.404036           0.000018               Storage_IP          Client_IP        2049       852         1393365090                580508043           1393372330         7306       7240       NFS         V3 WRITE Reply (Call In 1842) Len: 4096 FILE_SYNCV3 WRITE Reply (Call In 1862) Len: 4096 FILE_SYNC  ; V3 WRITE Reply (Call In 1859) Len: 8192 FILE_SYNC  ; V3 WRITE Reply (Call In 1869) Len: 4096 FILE_SYNC  ; V3 WRITE Reply (Call In 1896) Len: 4096 FILE_SYNC  ; V3 WRITE Reply (Call In 1900) Len: 4096 FILE_SYNC  ; V3 WRITE Reply (Call In 1931) Len: 16384 FILE_SYNC  ; V3 WRITE Reply (Call In 1903) Len: 4096 FILE_SYNC  ; V3 WRITE Reply (Call In 1906) Len: 4096 FILE_SYNC  ; V3 WRITE Reply (Call In 1918) Len: 16384 FILE_SYNC  ; V3 WRITE Reply (Call In 2004) Len: 65536 FILE_SYNC  ; V3 WRITE Reply (Call In 2070) Len: 65536 FILE_SYNC  ; V3 WRITE Reply (Call In 2099) Len: 20480 FILE_SYNC  ; V3 FSSTAT Reply (Call In 2140)  ; V3 WRITE Reply (Call In 2161) Len: 4096 FILE_SYNC

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