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diskpatch(1M)							 diskpatch(1M)

NAME    [Toc]    [Back]

     diskpatch - prevent stiction problems with	some disk drives

SYNOPSIS    [Toc]    [Back]

     diskpatch [-v] [-H	halt [-S delay]	[-F]] [-W]

DESCRIPTION    [Toc]    [Back]

     diskpatch is normally run from cron(1M) twice a week and whenever the
     system is shutdown.  It uses the hardware inventory mechanism to find all
     the disk drives on	the system attached to the supported SCSI controllers,
     (excluding	the jag(7M) controller)	and determines the type	of disk	drive
     by	sending	the SCSI inquiry command, using	the ds(7M) driver.

     If	the drive is found to be one of	the susceptible	drives,	a special
     command is	issued to the drive that causes	it to spin down	(stop) for a
     brief period, and then start again.  This sequence	prevents the stiction
     from occurring, in	most cases (stiction means that	the magnetic heads
     have become stuck to the surface of the drive media, usually preventing
     the drive from starting and preventing the	drive from being used).

     The options are:

     -v	       Verbose mode.  The inquiry info for each	disk drive found is

     -H	halt   Send a vendor specific command to the affected disk drives that
	       will usually prevent stiction from occurring.  halt is the
	       interval	in seconds the drive will remain halted; the interval
	       should be 30 seconds.  Normally this command is ignored by the
	       disk drive if it	has been running less than 48 hours since last
	       turned off or the command was last issued.

     -F	       Forces the cleaning action specified by -H regardless of	time
	       since last issued or hours powered on.

     -S	delay  Specify the delay in seconds between sets of drives, to avoid
	       overloading the drive's power supply.  An attempt is made to
	       overlap drives to reduce	the overall runtime.

     -W	       Warns if	the firmware isn't new enough to support this command,
	       and the disk appears to be one of the susceptible disk drives.

NOTE    [Toc]    [Back]

     This command must be run as the superuser.

SEE ALSO    [Toc]    [Back]

     cron(1M), ds(7M).

									PPPPaaaaggggeeee 1111
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