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How to troubleshoot NFS APD issues on VMware ESXi

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • VMware ESXi
  • NFS

Description

  • An all paths down (APD) timer is started when there has been a 5 second period with no communcation on any given TCP stream
  • After 140 seconds of being in this state, the connection is considered lost and an APD timeout is reached
    • Possible errors seen in VMware logs include, but not limited to:

YYYY-MM-DD T00:26:51.504Z: [APDCorrelator] xxxxxxxxxxxxxus: [esx.problem.storage.apd.timeout] Device or filesystem with identifier [xxxxxxxx-xxxxxxxx] has entered the All Paths Down Timeout state after being in the All Paths Down state for 140 seconds. I/Os will now be fast failed.

NFSLock: 608: Stop accessing fd 0x410011446d28  3
NFS: 133: Lost connection to the server 192.168.0.1 mount point /vol/datastore, mounted as xxxxxxxxx-xxxxxxxx-0000-000000000000 (“datastore”)

StorageApdHandler: 248: APD Timer started for ident [xxxxxxxx-xxxxxxxx]
StorageApdHandler: 846: APD Start for ident [xxxxxxxx-xxxxxxxx]!
StorageApdHandler: 277: APD Timer killed for ident [xxxxxxxx-xxxxxxxx]
StorageApdHandler: 902: APD Exit

[vob.storage.apd.start] Device or filesystem with identifier [xxxxxx-xxxxxxx] has entered the All Paths Down state
WARNING: NFS: xxx: Lost connection to the server xxxx mount point /xxxx, mounted as xxxxxx-xxxxxx-0000-000000000000 ("xxxxxxxx")
 
  • ONTAP may log at the time of the APD 
kernel: Nblade.nfsConnResetAndClose:error]: Shutting down connection with the client. Vserver ID is xx; network data protocol is NFS, Rpc Xid xxxxx; client IP address:port is x.x.x.x:xxxx. local IP address is x.x.x.x; reason is CSM error - Maximum number of rewind attempts has been exceeded
ERROR Nblade.CallbackTimedOut: SM NOTIFY: Vserver xx, Vif xxx: PORTMAP program (Program number:100000 Program version:2) on client x.x.x.x is not responding

 

 

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