This article provides steps to workaround the issue if unable to unmount NFS datastore in ESXi 6.x.
When using NFS datastores on some NetApp NFS filer models on an ESXi host, the following symptoms may appear.
NFSLock: 515: Stop accessing ## ######### #
NFS: 283: Lost connection to the server ###.###.###.# mount point /vol/datastore##, mounted as
########
-########
-####-############ ("datastore##")NFSLock: 477: Start accessing ##
#########
againNFS: 292: Restored connection to the server
###.###.###.#
mount point /vol/datastore##, mounted as
-########
-########
-################
("datastore##")
<YYYY-MM-DD>T<time> Z cpu2:8194)StorageApdHandler: 277: APD Timer killed for ident [
]########
-########
</time><YYYY-MM-DD>T<time></time> 607Z cpu2:8194)StorageApdHandler: 402: Device or filesystem with identifier [
] has exited the All Paths Down state.########
-########
<YYYY-MM-DD>T<time></time> Z cpu2:8194)StorageApdHandler: 902: APD Exit for ident [
]!########
-########
<YYYY-MM-DD>T<time></time> Z cpu16:8208)NFSLock: 570: Start accessing ## ############## again
<YYYY-MM-DD>T<time></time> Z cpu2:8194)WARNING: NFS: 322: Lost connection to the server ##.##.##.# mount point /vol/nfsexamplevolume, mounted as
-########
-########
-################
("NFS_EXAMPLE_VOLUME")<YYYY-MM-DD>T<time></time> Z cpu2:8194)WARNING: NFS: 322: Lost connection to the server
##.##.##.#
mount point /vol/nfsexamplevolume2, mounted as
("NFS_EXAMPLE_VOLUME2")
-########
-########
-################
<YYYY-MM-DD>T<time></time> Z: [vmfsCorrelator] ###############
: [esx.problem.vmfs.nfs.server.disconnect] ###.###.###.#
/vol/datastore## ########
-########
-####
-############
volume-name:datastore##
<YYYY-MM-DD>T<time></time> Z: [vmfsCorrelator] ##############
: [esx.problem.vmfs.nfs.server.restored] ###.###.###.#
/vol/datastore## ########
-########
-####
-############
volume-name:datastore##
No Time Source Destination Protocol Length Info
###### ###.###### ##.#.#.## ##.#.#.##
RPC 574 [TCP ZeroWindow] Continuation
###### ###.###### ##.#.#.## ##.#.#.##
TCP 1514 [TCP ZeroWindow] [TCP segment of a reassembled PDU]
VMware vSphere ESXi 6.x
VMware vSphere ESXi 7.x
VMware vSphere ESXi 8.x
NFS.MaxQueueDepth
advanced parameter to a much lower value. This reduces or eliminates the disconnections.MaxQueueDepth
, circumventing the issue.NFS.MaxQueueDepth
advanced parameter using the vSphere Client:
NFS.MaxQueueDepth
.NFS.MaxQueueDepth
advanced parameter via the command line:
esxcfg-advcfg -s 64 /NFS/MaxQueueDepth
esxcfg-advcfg -g /NFS/MaxQueueDepth