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316 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
6543210
00000000 0
100000000
Reserved
200000000
300000000
400000000
5
Control
00h
Table
number
216