Since ufs is not a cluster file system, you would need to write a script to
unmount and mount it read only and then mount it write access on the second
system.
But a better solution would be use use two luns one for each system for zfs see
zfa man page:
Example 18 Setting sharenfs Property Options on a ZFS File
System
The following commands show how to set "sharenfs" property
options to enable rw access for a set of IP addresses and to
enable root access for system neo on the tank/home file sys-
tem.
# zfs set sharenfs='r...@123.123.0.0/16,root=neo' tank/home
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