Tandberg Data SDLT220-320 INTEGRATION, Руководство пользователя

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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.
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 6-3. Indicator Pattern During POST
Stage What Can Be Observed
1 The LEDs light in a progressing pattern from left to right.
2
The red and yellow LEDs are extinguished and the green LED
flashes until POST completes.
3
If POST fails, the green and yellow LED will illuminate
steadily and the red LED will blink.
Table 6-4. SCSI Command Timeout Values
Command Timeout
ERASE 6 hours (overwrite entire tape)
INQUIRY 500 milliseconds
LOAD/UNLOAD 16 minutes
LOCATE 6 hours
LOG SELECT 500 milliseconds
LOG SENSE 500 milliseconds
MODE SELECT 500 milliseconds
MODE SENSE 500 milliseconds