Date: Sun, 24 Oct 2010 17:35:32 +0100 From: Bruce Cran <bruce@cran.org.uk> To: src-committers@freebsd.org Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org Subject: Re: svn commit: r214279 - in head: share/man/man4 sys/cam sys/cam/ata sys/kern Message-ID: <201010241735.32876.bruce@cran.org.uk> In-Reply-To: <201010241631.o9OGVw1C033817@svn.freebsd.org> References: <201010241631.o9OGVw1C033817@svn.freebsd.org>
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On Sunday 24 October 2010 17:31:58 Bruce Cran wrote: > Log: > Mostly revert r203420, and add similar functionality into ada(4) since > the existing code caused problems with some SCSI controllers. > > A new sysctl kern.cam.ada.spindown_shutdown has been added that controls > whether or not to spin-down disks when shutting down. > Spinning down the disks unloads/parks the heads - this is > much better than removing power when the disk is still > spinning because otherwise an Emergency Unload occurs which may cause > damage to the actuator. The FLUSH CACHE + STANDBY IMMEDIATE commands are issued (instead of just SLEEP) following the procedure documented in Fujitsu's MHW series product documentation under section 1.10.1, "Recommended power-off sequence". -- Bruce Cran
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