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NFS access hangs and CLI commands hang or slow to respond after upgrading cluster with flexcache to 9.15.1

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Category:
ontap-9
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nas
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Applies to

  • Ontap 9.15.1+
  • Flexcache
  • NFS

 

Issue

  • After upgrading a node hosting a flexcache to 9.15.1+ NFS access hangs and most CLI commands hang or are slow to receive responses
  • The following is also seen in logs
    • sktrace.log shows Slow SPINVFS_FILEOPS_<OP> with "time=<val>",  greater than 5000 
      • SPINVFS_FILEOPS_WRITERPC: spin_writerpc end: tid=(123456:spiniod 3) vnode 0xfffff1234a5678b0 dsid 0xa12b34cd fid 12345, err=0, time=7227 ms
    • mgwd.log may log 'SQLite mutex_trace: long delay in enter'
      • [kern_mgwd:info:3822] 0xabcdef01234: 0: WARNING: SQL_CONTEXT: sqlite_mutex_leave_traced:src/sql_context.cc:609 SQLite mutex_trace: long delay in enter (6353ms) for mutex 0x123a01234
    • ems may log CTRAN Connection closed
      • CsmMpAgentThread: csm.connClose:debug]: Session (req=node:dblade, rsp=node:dblade, uniquifier=0b01234567890123) with Tag CTRAN: Connection from local lif 0 to remote IP is closed.
  • Nodes with 48 or more CPU cores and a large number of flexcache relationships to a large number of remote nodes are more likely to experience this issue

 

 

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