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Dell PowerVault ML6000 Dell PowerVault ML6000 SCSI Reference Guide - Page 44

Mode Sense (6) Response, Mode Parameter Header, Control PC, Code, Allocation Length

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Page Control (PC) - This field indicates the type of mode page parameter values to return as shown in the following table Table 31 Page Control (PC) field Page Control Description 0 0 Report current values defined by: • The values set by the last successful MODE SELECT command. • The default values if no saved values exist. 0 1 Report changeable values 1 0 Report default values 1 1 Report saved values (report default values if no pages are previously saved) Page Code - This field determines which pages should be reported. For a list of available mode pages, see Table 36 on page 37. Allocation Length - This field specifies the number of bytes that the initiator allocated for returned MODE SENSE data. A length of 0 means that the library will return no MODE SENSE data. This is not considered to be an error. Mode Sense (6) Response The six-byte MODE SENSE response consists of a single four-byte Mode Parameter Header, followed by zero or more mode pages. Each page is individually described in "Mode Pages." Mode Parameter Header The following table lists the format of the Mode Parameter Header for the six-byte MODE SENSE command. Table 32 Mode Parameter Header format for Mode Sense (6) Bit Byte 7 6 5 4 3 2 1 0 0 Mode Data Length 1 Reserved 2 Reserved 3 Reserved Mode Data Length - This specifies the length in bytes that is available to be transferred as part of the response. The Mode Data Length does not include itself but does include the remaining 3 bytes of the parameter header, as well as the overall total number of bytes being sent for all requested pages. 34 SCSI Commands

Section	Page
Contents	3
Tables	7
SCSI Command Support	11
Device Model	11
Controller Device Commands and Parameters	12
Media Changer Commands and Parameters	13
General Command Support Behavior	15
Multiple Initiator Support	15
Element Addressing	15
Command Status	15
Unit Attentions	16
Resets	16
Common CDB Fields	16
Reserved Fields	17
Online/Offline Operation	17
Supported Interfaces	17
SCSI Parallel Interface Support	17
Supported Messages	17
Fibre Channel Interface Support	18
Logical Libraries	19
Mailbox Behavior	19
Autocleaning	19
Removed Drives	20
SCSI Commands	21
Initialize Element Status - 07h	21
What the Library Does With This Command	21
Command Usage	21
Initialize Element Status CDB Format	22
Initialize Element Status With Range - E7h	23
What the Library Does With This Command	23
Command Usage	23
Initialize Element Status With Range CDB Format	23
Inquiry - 12h	25
What the Library Does With This Command	25
Command Usage	25
Inquiry CDB Format	25
Standard Inquiry Response	26
Vital Product Data Pages	27
Supported Vital Product Data Page (00h)	28
Unit Serial Number Page (80h)	29
Device Identification Page (83h)	30
Log Sense - 4Dh	34
What the Library Does with This Command	34
Command Usage	34
Log Sense CDB Format	34
Log Sense Response	35
Log Page Format	35
Supported Log Page (00h)	37
Tape Alert Log Page (2Eh)	37
Mode Select (6) - 15h	39
What the Library Does With This Command	39
Command Usage	39
Mode Select (6) CDB Format	39
Mode Parameter Header	40
Mode Select (10) - 55h	41
What the Library Does With This Command	41
Command Usage	41
Mode Select (10) CDB Format	41
Mode Parameter Header	42
Mode Sense (6) - 1Ah	43
What the Library Does With This Command	43
Command Usage	43
Mode Sense (6) CDB Format	43
Mode Sense (6) Response	44
Mode Parameter Header	44
Mode Sense (10) - 5Ah	45
What the Library Does With This Command	45
Command Usage	45
Mode Sense (10) CDB Format	45
Mode Sense (10) Response	46
Mode Parameter Header	46
Mode Pages	47
Disconnect-Reconnect Page (02h)	48
Fibre Channel Logical Unit Control Page (18h)	49
Fibre Channel Port Control Page (19h)	50
Informational Exceptions Control Page (1Ch)	51
Element Address Assignment Page (1Dh)	53
Transport Geometry Parameters Page (1Eh)	54
Device Capabilities Page (1Fh)	55
All Mode Pages (3Fh)	55
Move Medium – A5h	56
What the Library Does With This Command	56
Command Usage	56
Move Medium CDB Format	57
Persistent Reserve In – 5Eh	58
What the Library Does With This Command	58
Command Usage	58
Persistent Reserve In CDB Format	58
Persistent Reserve In Response	58
Read Keys Response	59
Read Reservations Response	60
Persistent Reserve Out – 5Fh	61
What the Library Does With This Command	61
Command Usage	61
Persistent Reserve Out CDB Format	61
Position to Element – 2Bh	63
What the Library Does With This Command	63
Command Usage	63
Position to Element CDB Format	63
Prevent Allow Medium Removal – 1Eh	64
What the Library Does With This Command	64
Command Usage	64
Prevent Allow Medium Removal CDB Format	64
Read Buffer – 3Ch	65
What the Library Does With This Command	65
Command Usage	65
Read Buffer CDB Format	65
Read Buffer Response	66
Read Element Status – B8h	68
What the Library Does With This Command	68
Command Usage	68
Read Element Status CDB Format	68
Read Element Status Response	70
Element Status Header	70
Element Status Page	71
Element Descriptors	71
Primary Volume Tag Field	72
Medium Transport Element Descriptor	72
Storage Element Descriptor	73
Import/Export Element Descriptor	74
Data Transfer Element Descriptor	75
Release Element – 17h	77
What the Library Does With This Command	77
Command Usage	77
Release Element CDB Format	77
Report LUNS – A0h	78
What the Library Does With This Command	78
Command Usage	78
Report LUNS CDB Format	78
Report LUNS Response	79
Request Sense – 03h	80
What the Library Does With This Command	80
Command Usage	80
Request Sense CDB Format	80
Request Sense Response	81
Additional Sense Codes and Qualifiers	82
Reserve Element - 16h	86
What the Library Does With This Command	86
Command Usage	86
Reserve Element CDB Format	86
Send Diagnostic - 1Dh	87
What the Library Does With This Command	87
Command Usage	87
Send Diagnostic CDB Format	87
Test Unit Ready (00h)	88
What the Library Does With This Command	88
Command Usage	88
Test Unit Ready CDB Format	88
Write Buffer (3Bh)	89
What the Library Does With This Command	89
Command Usage	89

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SCSI Commands

Page Control (PC)

- This field indicates the type of mode page parameter values to return as shown in the

following table

Page Code

- This field determines which pages should be reported. For a list of available mode pages, see

Table 36

on page 37.

Allocation Length

- This field specifies the number of bytes that the initiator allocated for returned MODE

SENSE data. A length of 0 means that the library will return no MODE SENSE data. This is not considered

to be an error.

Mode Sense (6) Response

The six-byte MODE SENSE response consists of a single four-byte Mode Parameter Header, followed by

zero or more mode pages. Each page is individually described in “Mode Pages.”

Mode Parameter Header

The following table lists the format of the Mode Parameter Header for the six-byte MODE SENSE command.

Mode Data Length

- This specifies the length in bytes that is available to be transferred as part of the

response. The Mode Data Length does not include itself but does include the remaining 3 bytes of the

parameter header, as well as the overall total number of bytes being sent for all requested pages.

Table 31

Page Control (PC) field

Page Control

Description

Report current values defined by:

•

The values set by the last successful MODE SELECT command.

•

The default values if no saved values exist.

Report changeable values

Report default values

Report saved values (report default values if no pages are previously saved)

Table 32

Mode Parameter Header format for Mode Sense (6)

Bit

Byte

Mode Data Length

Reserved