Using spindown to prolong the life of old hard disks


 
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Old 04-22-2008
Using spindown to prolong the life of old hard disks

Tue, 22 Apr 2008 15:00:00 GMT
Many people leave their computers on around the clock. This usually implies that all the attached hard disks are always spinning. Constantly spinning up a hard disk normally increases the chances of drive failure. When a disk is not powered it should last longer than if it was spinning. There is a delicate balance between having a hard disk spinning down and up too frequently and leaving it spinning around the clock. If you have a filesystem that you want to have near instant access to but do so on an infrequent basis, you might like to use spindown to automatically spin down the disk containing that filesystem after you have finished accessing the drive.


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hdio(7I)							  Ioctl Requests							  hdio(7I)

NAME
hdio - SMD and IPI disk control operations SYNOPSIS
#include <sys/hdio.h> DESCRIPTION
Note - The SMC and IPI drivers have been discontinued. dkio(7I) is now the preferred method for retrieving disk information. The SMD and IPI disk drivers supplied with this release support a set of ioctl(2) requests for diagnostics and bad sector information. Basic to these ioctl() requests are the definitions in <sys/hdio.h>. IOCTLS
HDKIOCGTYPE The argument is a pointer to a hdk_type structure (described below). This ioctl() gets specific information from the hard disk. HDKIOCSTYPE The argument is a pointer to a hdk_type structure (described below). This ioctl() sets specific information about the hard disk. /* * Used for drive info */ struct hdk_type { ushort_t hdkt_hsect; /* hard sector count (read only) */ ushort_t hdkt_promrev; /* prom revision (read only) */ uchar_t hdkt_drtype; /* drive type (ctlr specific) */ uchar_t hdkt_drstat; /* drive status (ctlr specific, ro) */ }; HDKIOCGBAD The argument is a pointer to a hdk_badmap structure (described below). This ioctl() is used to get the bad sector map from the disk. HDKIOCSBAD The argument is a pointer to a hdk_badmap structure (described below). This ioctl() is used to set the bad sector map on the disk. /* * Used for bad sector map */ struct hdk_badmap { caddr_t hdkb_bufaddr; /* address of user's map buffer */ }; HDKIOCGDIAG The argument is a pointer to a hdk_diag structure (described below). This ioctl() gets the most recent command that failed along with the sector and error number from the hard disk. /* * Used for disk diagnostics */ struct hdk_diag { ushort_t hdkd_errcmd; /* most recent command in error */ daddr_t hdkd_errsect; /* most recent sector in error */ uchar_t hdkd_errno; /* most recent error number */ uchar_t hdkd_severe; /* severity of most recent error */ }; SEE ALSO
ioctl(2), dkio(7I) SunOS 5.10 13 Aug 2002 hdio(7I)