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rpokala
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2015-12-11T21:50:59.964763Z
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[PR 195033] Document mps.enable_ssu

mps(4) sends StartStopUnit to SATA direct-access devices during shutdown.
Document the tunables which control that behavior.

PR:		195033
Reviewed by:	scottl
Approved by:	jhb
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D4456

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