NAME

ap_dmd - AP disk meta-driver

SYNOPSIS

ap_dmd@target,lun:partition

DESCRIPTION

The ap_dmd driver works with the AP software to support Alternate Pathing for physical devices handled by the ssd SCSI disk driver. See ssd(7) in man Pages(7): Device and Network Interfaces of the SunOS Reference Manual.

The AP feature lets you configure alternate SCSI paths to a physical device. These paths are associated with a meta-disk device, which is one of the file system special nodes associated with a particular meta-driver.

ap_dmd allows the AP Librarian, ap(7), to configure or unconfigure physical paths to a SCSI device via an interface that allows SET, UNSET, and SWITCH commands. These commands are issued by ap(7) at the behest of the user-invoked AP commands and AP daemon. To change the SCSI path information associated with a particular ap_dmd device, use apconfig(1M), apdb(1M) and apdisk(1M). For more information, see the Alternate Pathing 2.0 User's Guide

All device operations supported by the ssd driver are also valid on ap_dmd devices that have been created via AP commands. See the other AP commands for details regarding other components of AP software, and ssd(7) man page for information about block/character file accesses, I/O requests, disk partitioning schemes, CD-ROM support, and ioctls.

ERRORS

ENXIO

No physical SCSI path to the target device exists.

Other

For information on other errors, see sd(7).

FILES

apdmd.conf

driver configuration file

/dev/ap/dsk/mncntndnsn

block files

/dev/ap/rdsk/mncntndnsn

raw files

where m identifies the device as a meta-device and:

cn

Controller number

tn

Target number

dn

Logical unit number

sn

Slice (partition) number

DIAGNOSTICS

See ssd(7) in man Pages(7): Device and Network Interfaces of the SunOS Reference Manual.

AP Special Files..ap_dmd ( 7 ) SEE ALSO

Alternate Pathing 2.0 User's Guide

apconfig(1M), apdb(1M), apdisk(1M), apnet(1M), ap_daemon(1M) in man Pages(1M): Alternate Pathing Administration Commands

ap(7), ap_nmd(7) in man Pages(7): Alternate Pathing Special Files

ssd(7) in man Pages(7): Device and Network Interfaces of the SunOS Reference Manual