Here are some examples but check out the luxadm man page there are examples for pathnames of all kinds of different storages and how to look them up.
eg.
luxadm -v fast_write -d /devices/sbus@1f,0/SUNW,socal@1,0/sf@0,0/ssd@w2200002037000f96,0:a,raw
luxadm -v fast_write -e /devices/sbus@3.0/SUNW,socal@d,10000/sf@0,0/ssd@w2200002037049fc3,0:a,raw
Part of the man page:
SPARCstorage Array Subcommands
fast_write [ -s ] -c pathname
fast_write [ -s ] -d pathname
fast_write [ -s ] -e pathname
Enable or disable the use of the NVRAM to enhance the
performance of writes in the SPARCstorage Array. path-
name refers to the SPARCstorage Array controller or to
an individual disk.
SunOS 5.9 Last change: 4 Sep 2001 13
System Administration Commands luxadm(1M)
-s Cause the SPARCstorage Array to save the change
so it will persist across power-cycles.
-c Enable fast writes for synchronous writes only.
-d Disable fast writes.
-e Enable fast writes.