DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126
Issue 4
June 1999
Maintenance Object Repair Procedures
9-546DISK (MSS Disk Circuit Pack)
9
System Technician-Demanded Tests: Descriptions
and Error Codes
Always investigate tests in the order presented in the table below when
inspecting errors in the system. By clearing error codes associated with the
Disk
Reset Test
, for example, you may also clear errors generated from other tests in
the testing sequence.
Disk Reset Test (#809 and #894)
The Disk Reset Test consists of the following steps controlled by firmware on the
Host Adapter Circuit (located on the MSSNET circuit pack):
■ Disk Drive reset: A SCSI BUS DEVICE RESET message is transmitted to
the Disk circuit pack to reset it.
■ Presence test: A SCSI INQUIRY command is sent to the Disk Drive to
attempt to query it. If the Disk Drive is present, it will return information
about the device type, whether or not its medium is removable,
compatibility with established standards, vendor and product IDs, and
other miscellaneous information.
■ Start unit: This starts the disk drive spinning.
■ Capacity test: A SCSI READ CAPACITY command is sent to the Disk
Drive. It returns with the logical block address and the block length of the
last logical block on the medium. This is necessary to restore the
information lost after the reset and verify that the device can be accessed.
A SCSI READ DATA BUFFERS command is sent to the Disk Drive. This
returns the size of the controller memory data buffers.
Order of Investigation
Short Test
Sequence
Long Test
Sequence
Reset Board
Sequence D/ND
1
1. D = Destructive; ND = Nondestructive
Disk Reset Test (#809) X X ND
Disk Diagnostic Test (#813) X X ND
Disk Looparound Test (#814) X X ND
Disk Status Test (#815) X X ND
Disk Firmware Error Counters
Read and Clear Test (#812)
XX ND
Disk Write-Read Test (#810) X ND
Disk Audit Test (#811) X ND
Disk Reset Test (#894) X ND
