/var/log/vmkernel.log
file on the ESXi host, you see entries similar to:NFSLock: 515: Stop accessing fd 0xc21eba0 4
NFS: 283: Lost connection to the server 192.168.100.1 mount point /vol/datastore01,
mounted as bf7ce3db-42c081a2-0000-000000000000 ("datastore01")
NFSLock: 477: Start accessing fd 0xc21eba0 again
NFS: 292: Restored connection to the server 192.168.100.1 mount point /vol/datastore01,
mounted as bf7ce3db-42c081a2-0000-000000000000 ("datastore01")
<YYYY-MM-DD>T<time> Z cpu2:8194)StorageApdHandler: 277: APD Timer killed for ident [b63367a0-e78ee62a]
<YYYY-MM-DD>T<time> Z cpu2:8194)StorageApdHandler: 402: Device or filesystem with ID [b63367a0-e78ee62a] exited All Paths Down state.
<YYYY-MM-DD>T<time> Z cpu2:8194)StorageApdHandler: 902: APD Exit for ident [b63367a0-e78ee62a]!
<YYYY-MM-DD>T<time> Z cpu6:8208)NFSLock: 570: Start accessing fd 0x4100108487f8 again
<YYYY-MM-DD>T<time> Z cpu2:8194)WARNING: NFS: 322: Lost connection to the server 10.20.90.2 mount point /vol/nfs_snapmirror_test,
mounted as bd5763b1-19271ed7-0000-000000000000 ("AFO_SNAPMIRROR_TEST")
<YYYY-MM-DD>T<time> Z cpu2:8194)WARNING: NFS: 322: Lost connection to the server 10.20.90.2 mount point /vol/nfs_vmware_isos_vol01,
mounted as 654dc625-6010e4e6-0000-000000000000 ("NFS_SATA_ISOS_VOL01")</time></time></time></time></time></time>
<YYYY-MM-DD>T<time> Z: [vmfsCorrelator] 6084893035396us: [esx.problem.vmfs.nfs.server.disconnect]
192.168.100.1 /vol/datastore01 bf7ce3db-42c081a2-0000-000000000000 volume-name:datastore01
<YYYY-MM-DD>T<time> Z: [vmfsCorrelator] 6085187880809us: [esx.problem.vmfs.nfs.server.restored]
192.168.100.1 /vol/datastore01 bf7ce3db-42c081a2-0000-000000000000 volume-name:datastore01</time></time>
No Time Source Destination Protocol Length Info 784095 325.356980 10.1.1.35 10.1.1.26 RPC 574 [TCP ZeroWindow] Continuation 792130 325.452001 10.1.1.35 10.1.1.26 TCP 1514 [TCP ZeroWindow] [TCP segment of a reassembled PDU]
Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.
Note: VMware suggests a value of 64. If this is not sufficient to stop the disconnects, you may need to further reduce the value by half. For example, change the value to 32 or 16 accordingly until the disconnects cease.