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|Oracle Solaris Tunable Parameters Reference Manual Oracle Solaris 10 1/13 Information Library|
0 (enabled) or 1 (disabled)
In general, metadata compression should be enabled. For metadata intensive loads, this default is expected to gain some amount of space (a few percentages) at the expense of a little extra CPU computation. However, a bigger motivation exists to have metadata compression on. For directories that grow to millions of objects then shrink to just a few, metadata compression saves large amounts of space (greater than 10 times).
I/O on flash storage devices is aligned along 4 KB boundaries. If metadata compression is enabled, the I/O on flash storage devices might become unaligned. You might consider disabling metadata compression to resolve the I/O alignment problem if you are using flash devices for primary storage. Using separate log devices on flash devices are not effected by the alignment problem.