06-09-2009
ZFS will complain if you try and mount a file system twice.
UFS won't put out any messages if multiple hosts mount the same file system, and I assume it could panic your host if more than one host were to write to it at the same time.
If you're concerned about multiple hosts accessing your file systems, you could mask LUNs on your at the switch (as noted above) or at the storage itself, depending on your configuration.
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LEARN ABOUT MOJAVE
showmount
SHOWMOUNT(8) BSD System Manager's Manual SHOWMOUNT(8)
NAME
showmount -- show remote NFS mounts on host
SYNOPSIS
showmount [-Ae36] [-a | -d] [host]
DESCRIPTION
showmount shows status information about the NFS server on host. By default it prints the names of all hosts that have NFS file systems
mounted on the host. See NFS: Network File System Protocol Specification, RFC 1094, Appendix A, and NFS: Network File System Version 3
Protocol Specification, Appendix I, for a detailed description of the protocol.
-A Search for NFS servers advertised via Bonjour.
-a List all mount points in the form: host:dirpath
-d List directory paths of mount points instead of hosts.
-e Show the host's exports list.
-3 Use mount protocol Version 3, compatible with NFS Version 3.
-6 Use only IPv6 addresses to contact servers.
SEE ALSO
mount(1), mountd(8), nfsd(8), mDNSResponder(8)
BUGS
The mount daemon running on the server only has an idea of the actual mounts, since the NFS server is stateless. showmount will only display
the information as accurately as the mount daemon reports it.
HISTORY
The showmount utility first appeared in 4.4BSD.
4th Berkeley Distribution September 26, 2010 4th Berkeley Distribution