IBM SG24-5131-00 manual Diagnostics, #lsdev -Cc disk grep SSA

#lsdev -Cc disk grep SSA

hdisk3	Available 00-07-L	SSA Logical Disk Drive
hdisk4	Available 00-07-L	SSA Logical Disk Drive
hdisk5	Available 00-07-L	SSA Logical Disk Drive
hdisk6	Available 00-07-L	SSA Logical Disk Drive
hdisk7	Available 00-07-L	SSA Logical Disk Drive
hdisk8	Available 00-07-L	SSA Logical Disk Drive

SSA physical disks:

•Are configured as pdisk0, pdisk1,...,pdiskN.

•Have errors logged against them in the system error log.

•Support a character special file (/dev/pdisk0, /dev/pdisk1,...,/dev/p.diskN).

•Support the IOCTLl subroutine for servicing and diagnostic functions.

•Do not accept read or write subroutine calls for the character special file.

In order to list the physical disk definitions use the following command:

#lsdev -Cc pdisk grep SSA

pdisk0 Available 00-07-P 1GB SSA C Physical Disk Drive pdisk1 Available 00-07-P 1GB SSA C Physical Disk Drive pdisk2 Available 00-07-P 1GB SSA C Physical Disk Drive pdisk3 Available 00-07-P 1GB SSA C Physical Disk Drive pdisk4 Available 00-07-P 1GB SSA C Physical Disk Drive pdisk5 Available 00-07-P 1GB SSA C Physical Disk Drive

Diagnostics

A good tool to get rid of SSA problems are the SSA service aids in the AIX diagnostic program diag. The SSA diagnostic routines are fully documented in A Practical Guide to SSA for AIX, SG24-4599. The following is a brief overview:

The SSA service aids are accessed from the main menu of the diag program. Select Task Selection -> SSA Service Aids. This will give you the following options:

Set Service Mode	This option enables you to determine the location
	of a specific SSA disk drive within a loop and to
	remove the drive from the configuration, if
	required.
Link Verification	This option enables you to determine the
	operational status of a link
	Cluster Hardware and Software Preparation 69