53 test unit ready command, Test unit ready command – Seagate Fibre Channel Interface User Manual
Page 330
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Fibre Channel Interface Manual, Rev. D
12.53
Test Unit Ready command
The Test Unit Ready command provides a means to verify the logical unit is ready. This is not a request for a
self test. If the logical unit (drive) can accept an appropriate medium access command without returning Check
Condition status, the drive returns a Good status.
If the drive cannot become operational or is in a state such that an initiator action (e.g., Start command) is
required to make the unit ready, the drive returns Check Condition status with a sense key of Not Ready. One
of several possible additional sense codes indicates the reason for the Not Ready condition.
Field definitions (listed alphabetically)
Control
See Control Bytes in Section 11.2.1.6.
Table 216: Test Unit Ready command (00h)
Bit
Byte
7
6
5
4
3
2
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
Reserved
2
0
0
0
0
0
0
0
0
3
0
0
0
0
0
0
0
0
4
0
0
0
0
0
0
0
0
5
Control
00h
Table
number