Perhaps you need to read the Solaris Tunable Parameters Reference Manual which says the following about maxphys:
Default
131,072 (Sun-4u) or 57,344 (x86). The sd driver uses the value of 1,048,576
if the drive supports wide transfers. The ssd driver uses 1,048,576 by
default.
If you are using fibre, you will be using 1,048,576 by default.
-- richard
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