ssadisk SSA Disk Device Driver
Purpose Toprovide support for Serial Storage Architecture (SSA) disk drives.
Syntax #include <sys/devinfo.h>
#include <sys/ssa.h>
#include <sys/ssadisk.h>
Configuration IssuesSSA Logical Disks, SSA Physical Disks, and SSARAID Arrays
Serial StorageArchitecture (SSA) disk drives are represented in the operating system
as SSAlogical disks (hdisk0, hdisk1.....hdiskN) and SSA physical disks
(pdisk0,pdisk1.....pdiskN). SSARAID arrays are represented as SSA logical disks
(hdisk0, hdisk1.....hdiskN). SSAlogical disks represent the logical properties of the
disk drive or array,and can have volume groups and file systems mounted on them.
SSAphysical disks represent the physical properties of the disk drive.
By default:
vOne pdisk is always configured for each physical disk drive.
vOne 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.
SSAphysical disks have the following properties. They:
vAre configured as pdisk0, pdisk1.....pdiskn
vHave errors logged against them in the system error log
vProvide support for a character special file (/dev/pdisk0 /dev/pdisk1..../dev/pdiskn)
vProvide support for the ioctl subroutine for servicing and diagnostics functions
vDo not accept read or write subroutine calls for the character special file
SSAlogical disks have the following properties. They:
vAre configured as hdisk0, hdisk1.....hdiskn
vProvide support for a character special file (/dev/rhdisk0,
/dev/rhdisk1..../dev/rhdiskn)
vProvide support for a block special file (/dev/hdisk0, /dev/hdisk1..../dev/hdiskn)
vProvide support for the ioctl subroutine call for nonservice and diagnostics functions
only
vAccept the read and write subroutine call to the special files
vCan be members of volume groups, and have file systems mounted on them
266 User’s Guide and Maintenance Information
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