Dell PowerVault TL4000 SCSI Reference Guide - Page 18

INQUIRY, Standard, Inquiry - media attention

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INQUIRY (12h) The INQUIRY command requests that information regarding parameters of the medium changer be sent to the initiator. The media changer can provide two categories of data in response to an inquiry command: Standard Inquiry Data and Vital Product Data. Standard Inquiry Data contains basic data about the Medium Changer and Vital Product Data can comprise several pages of additional data. Each Vital Product Data page requires a separate INQUIRY command from the initiator. An INQUIRY command is not affected by, nor does it clear, a Unit Attention condition. Byte 0 1 2 3 4 5 Bit 7 (MSB) 6 LUN 5 4 3 2 1 0 Operation Code (12h) Reserved Page Code Allocation length Control Obsolete EVPD (LSB) Field descriptions: EVPD: Enable Vital Product Data. An enable vital product data (EVPD) bit of one specifies that the device server shall return the optional vital product data specified by the page code field. Note If the EVPD bit is set to 0, the page code must be 00h. Page Code: This field contains the page number of the vital product data page to be returned for the INQUIRY command, if the EVPD bit is set to 1. The following pages are supported: v 00h - Supported vital product pages v 80h - Unit serial number page v 83h - Device Identification page v C0h - Firmware build information page v D0h - Vendor Specific Page v FFh - Vendor Use Only Allocation Length: Specifies the number of bytes of inquiry information the media changer is allowed to return to the initiator during the command s data-in phase. Error status is not returned if the value in this field truncates the requested information. Standard Inquiry Data Byte 0 1 2 3 4 Bit 7 6 5 Peripheral Qualifier (0) RMB (1) Obsolete Obsolete NormACA (0) 4 3 2 1 0 Peripheral Device Type (08=Medium Changer) Reserved Version (5) HiSup Response data format (2) Additional length (43h) 3-4 TL2000 and TL4000 SCSI Reference

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INQUIRY
(12h)
The
INQUIRY
command
requests
that
information
regarding
parameters
of
the
medium
changer
be
sent
to
the
initiator.
The
media
changer
can
provide
two
categories
of
data
in
response
to
an
inquiry
command:
Standard
Inquiry
Data
and
Vital
Product
Data.
Standard
Inquiry
Data
contains
basic
data
about
the
Medium
Changer
and
Vital
Product
Data
can
comprise
several
pages
of
additional
data.
Each
Vital
Product
Data
page
requires
a
separate
INQUIRY
command
from
the
initiator.
An
INQUIRY
command
is
not
affected
by,
nor
does
it
clear,
a
Unit
Attention
condition.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(12h)
1
LUN
Reserved
Obsolete
EVPD
2
Page
Code
3
(MSB)
Allocation
length
4
(LSB)
5
Control
Field
descriptions:
EVPD:
Enable
Vital
Product
Data.
An
enable
vital
product
data
(EVPD)
bit
of
one
specifies
that
the
device
server
shall
return
the
optional
vital
product
data
specified
by
the
page
code
field.
Note
If
the
EVPD
bit
is
set
to
0,
the
page
code
must
be
00h.
Page
Code:
This
field
contains
the
page
number
of
the
vital
product
data
page
to
be
returned
for
the
INQUIRY
command,
if
the
EVPD
bit
is
set
to
1.
The
following
pages
are
supported:
v
00h
-
Supported
vital
product
pages
v
80h
-
Unit
serial
number
page
v
83h
-
Device
Identification
page
v
C0h
-
Firmware
build
information
page
v
D0h
-
Vendor
Specific
Page
v
FFh
-
Vendor
Use
Only
Allocation
Length:
Specifies
the
number
of
bytes
of
inquiry
information
the
media
changer
is
allowed
to
return
to
the
initiator
during
the
command
s
data-in
phase.
Error
status
is
not
returned
if
the
value
in
this
field
truncates
the
requested
information.
Standard
Inquiry
Data
Bit
7
6
5
4
3
2
1
0
Byte
0
Peripheral
Qualifier
(0)
Peripheral
Device
Type
(08=Medium
Changer)
1
RMB
(1)
Reserved
2
Version
(5)
3
Obsolete
Obsolete
NormACA
(0)
HiSup
Response
data
format
(2)
4
Additional
length
(43h)
3-4
TL2000
and
TL4000
SCSI
Reference