Power On Self Test; Scsi Command Timeout; Table 6-3. Indicator Pattern During Post; Table 6-4. Scsi Command Timeout Values - Tandberg Data SDLT220-320 INTEGRATION Manual

CHAPTER 6: SCSI and Controller Interface Specification

6.6 Power On Self Test

When power is applied to the tape system, the system performs a Power On Self
Test (POST). POST completes in approximately ten seconds. While POST is
running, the tape system responds BUSY to SCSI commands. The tape system
also responds to various SCSI messages during POST.
During this time, if a host tries to negotiate Synchronous or Wide transfers, the
tape system will negotiate to Asynchronous or Narrow. It may take longer than the
duration of POST for the drive to become ready.

Table 6-3. Indicator Pattern During POST

Stage
1
2
3

6.7 SCSI Command Timeout

Table 6-4 shows the length of time a SCSI command "waits" for a response before
it times out.

Table 6-4. SCSI Command Timeout Values

Command
ERASE
INQUIRY
LOAD/UNLOAD
LOCATE
LOG SELECT
LOG SENSE
MODE SELECT
MODE SENSE
What Can Be Observed
The LEDs light in a progressing pattern from left to right.
The red and yellow LEDs are extinguished and the green LED
flashes until POST completes.
If POST fails, the green and yellow LED will illuminate
steadily and the red LED will blink.
Timeout
6 hours (overwrite entire tape)
500 milliseconds
16 minutes
6 hours
500 milliseconds
500 milliseconds
500 milliseconds
500 milliseconds