Dell PowerVault ML6000 Dell PowerVault ML6000 SCSI Reference Guide - Page 43

Mode Sense (6) - 1Ah, What the Library Does With This Command, Command Usage

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Mode Sense (6) - 1Ah What the Library Does With This Command The library will return the current settings for the supported mode pages. This command can be issued to the Controller logical unit as well as the Media Changer logical units. The mode pages supported by each device vary. Command Usage This command can be used to determine certain operational settings governing the behavior of the library. For example, the number of elements and their assigned addresses can be obtained through use of MODE SENSE, which allows an application to adapt to a library configuration instead of using fixed values. Use of MODE SENSE to obtain these parameters during initialization is highly recommended to facilitate the most flexibility in supporting the library. Mode Sense (6) CDB Format The six-byte MODE SENSE CDB format is shown in the following table. Table 30 MODE SENSE CDB format Byte Bit 7 6 5 4 3 2 1 0 0 Op Code (1Ah) 1 Logical Unit Number Rsvd DBD Reserved 2 PC Page Code 3 Reserved 4 Allocation Length 5 Control Disable Block Descriptors (DBD) - A value of 0 or 1 is supported, although block descriptors are not returned. PowerVault ML6000 SCSI Reference Guide 33

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PowerVault ML6000 SCSI Reference Guide
33
Mode Sense (6) - 1Ah
What the Library Does With This Command
The library will return the current settings for the supported mode pages. This command can be issued to
the Controller logical unit as well as the Media Changer logical units. The mode pages supported by each
device vary.
Command Usage
This command can be used to determine certain operational settings governing the behavior of the library.
For example, the number of elements and their assigned addresses can be obtained through use of MODE
SENSE, which allows an application to adapt to a library configuration instead of using fixed values. Use of
MODE SENSE to obtain these parameters during initialization is highly recommended to facilitate the most
flexibility in supporting the library.
Mode Sense (6) CDB Format
The six-byte MODE SENSE CDB format is shown in the following table.
Disable Block Descriptors (DBD)
- A value of 0 or 1 is supported, although block descriptors are not
returned.
Table 30
MODE SENSE CDB format
Bit
Byte
7
6
5
4
3
2
1
0
0
Op Code (1Ah)
1
Logical Unit Number
Rsvd
DBD
Reserved
2
PC
Page Code
3
Reserved
4
Allocation Length
5
Control