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ssadisk SSA Disk Device Driver
Purpose
To provide support for Serial Storage Architecture (SSA) disk drives.
Syntax
#include <sys/devinfo.h>
#include <sys/ssa.h>
#include <sys/ssadisk.h>
Configuration Issues
SSA Logical Disks, SSA Physical Disks, and SSA RAID Arrays
Serial Storage Architecture (SSA) disk drives are represented in the operating system
as SSA logical disks (hdisk0, hdisk1.....hdiskN) and SSA physical disks
(pdisk0,pdisk1.....pdiskN). SSA RAID arrays are represented as SSA logical disks
(hdisk0, hdisk1.....hdiskN). SSA logical disks represent the logical properties of the
disk drive or array, and can have volume groups and file systems mounted on them.
SSA physical disks represent the physical properties of the disk drive.
By default:
v One pdisk is always configured for each physical disk drive.
v One hdisk is configured either for each disk drive that is connected to the using
system, or for each array.
By default, all disk drives are configured as system disk drives. The array management
software deletes hdisks to create arrays.
SSA physical disks have the following properties. They:
v Are configured as pdisk0, pdisk1.....pdiskn
v Have errors logged against them in the system error log
v Provide support for a character special file (/dev/pdisk0 /dev/pdisk1..../dev/pdiskn)
v Provide support for the ioctl subroutine for servicing and diagnostics functions
v Do not accept read or write subroutine calls for the character special file
SSA logical disks have the following properties. They:
v Are configured as hdisk0, hdisk1.....hdiskn
v Provide support for a character special file (/dev/rhdisk0,
/dev/rhdisk1..../dev/rhdiskn)
v Provide support for a block special file (/dev/hdisk0, /dev/hdisk1..../dev/hdiskn)
v Provide support for the ioctl subroutine call for nonservice and diagnostics functions
only
v Accept the read and write subroutine call to the special files
v Can be members of volume groups, and have file systems mounted on them
266 User’s Guide and Maintenance Information
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