Dell PowerVault ML6000 Dell PowerVault ML6000 SCSI Reference Guide - Page 88

Test Unit Ready (00h), What the Library Does With This Command, Command Usage

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Test Unit Ready (00h) What the Library Does With This Command The library returns status based on its current mode and state. These are defined in the following table. Table 74 Test Unit Ready statuses Mode State Status Online Ready Good Online Not Ready Check Condition Offline Ready Check Condition Offline Not Ready Check Condition It will also return any pending Unit Attentions regardless of the current mode and state, to convey changes within the subsystem, such as I/E station accesses, door openings, etc. The various types of Unit Attention conditions are listed in the Request Sense command section in Table 71 on page 72. Command Usage The TEST UNIT READY command allows the initiator to verify that the library is ready to accept commands or perform motion tasks. It is a suitable command for general polling to monitor the library, and receive information via Unit Attentions on any changes within the library. Test Unit Ready CDB Format The TEST UNIT READY CDB format is shown in the following table. Table 75 TEST UNIT READY CDB format Byte Bit 7 6 5 4 3 2 1 0 0 Op Code (00h) 1 Logical Unit Number Reserved 2 Reserved 3 Reserved 4 Reserved 5 Control 78 SCSI Commands

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78
SCSI Commands
Test Unit Ready (00h)
What the Library Does With This Command
The library returns status based on its current mode and state. These are defined in the following table.
It will also return any pending Unit Attentions regardless of the current mode and state, to convey changes
within the subsystem, such as I/E station accesses, door openings, etc. The various types of Unit Attention
conditions are listed in the Request Sense command section in
Table 71
on page 72.
Command Usage
The TEST UNIT READY command allows the initiator to verify that the library is ready to accept commands
or perform motion tasks. It is a suitable command for general polling to monitor the library, and receive
information via Unit Attentions on any changes within the library.
Test Unit Ready CDB Format
The TEST UNIT READY CDB format is shown in the following table.
Table 74
Test Unit Ready statuses
Mode
State
Status
Online
Ready
Good
Online
Not Ready
Check Condition
Offline
Ready
Check Condition
Offline
Not Ready
Check Condition
Table 75
TEST UNIT READY CDB format
Bit
Byte
7
6
5
4
3
2
1
0
0
Op Code (00h)
1
Logical Unit Number
Reserved
2
Reserved
3
Reserved
4
Reserved
5
Control