Dell PowerVault TL4000 SCSI Reference Guide - Page 67

Element, Status

Get Dell PowerVault TL4000 PDF manuals and user guides View all Dell PowerVault TL4000 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 67 highlights

READ ELEMENT STATUS (B8h) The READ ELEMENT STATUS command is sent to a target from the initiator requesting that the target report the status of its internal elements. Bit 7 Byte 0 1 2 (MSB) 3 4 (MSB) 5 6 7 (MSB) 8 9 10 11 6 LUN 5 4 3 2 1 0 Operation Code (B8h) VolTag Starting Element Address Element Type Code Number of Elements Reserved CurData (LSB) (LSB) DVCID Allocation Length Reserved Control (LSB) Field descriptions: VolTag: If the VolTag bit is set the media changer shall return volume tag information in the element descriptors. If the VolTag bit is not set the media changer shall not return volume tag information. Element Type Code: This field specifies the element type or types selected to report in response to this command. A value of 0 indicates that status for all element types is to be reported. 0h 1h 2h 3h 4h 5h - Fh Report all element types Report Medium Transport Elements (Cartridge pickers) Report Storage Elements (Cartridge Slots) Report Import / Export Elements (I/O Slots) Report Data Transfer Elements (Tape drives) Reserved Starting Element Address: This field indicates the starting element address. Elements greater or equal than the starting address are returned. Number of Elements: This field specifies the maximum number of element descriptors to return. If the allocation length is not sufficient to transfer all of the element information, the target transfers all the information that can be completely transferred; this is not an error condition. CurData: If the CurData bit is set the library shall return element status data without causing device motion. If the CurData bit is zero, the library may cause device motion to confirm element status data. Chapter 3. Supported SCSI Commands 3-53

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
READ
ELEMENT
STATUS
(B8h)
The
READ
ELEMENT
STATUS
command
is
sent
to
a
target
from
the
initiator
requesting
that
the
target
report
the
status
of
its
internal
elements.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(B8h)
1
LUN
VolTag
Element
Type
Code
2
(MSB)
Starting
Element
Address
3
(LSB)
4
(MSB)
Number
of
Elements
5
(LSB)
6
Reserved
CurData
DVCID
7
(MSB)
8
Allocation
Length
9
(LSB)
10
Reserved
11
Control
Field
descriptions:
VolTag:
If
the
VolTag
bit
is
set
the
media
changer
shall
return
volume
tag
information
in
the
element
descriptors.
If
the
VolTag
bit
is
not
set
the
media
changer
shall
not
return
volume
tag
information.
Element
Type
Code:
This
field
specifies
the
element
type
or
types
selected
to
report
in
response
to
this
command.
A
value
of
0
indicates
that
status
for
all
element
types
is
to
be
reported.
0h
Report
all
element
types
1h
Report
Medium
Transport
Elements
(Cartridge
pickers)
2h
Report
Storage
Elements
(Cartridge
Slots)
3h
Report
Import
/
Export
Elements
(I/O
Slots)
4h
Report
Data
Transfer
Elements
(Tape
drives)
5h
-
Fh
Reserved
Starting
Element
Address:
This
field
indicates
the
starting
element
address.
Elements
greater
or
equal
than
the
starting
address
are
returned.
Number
of
Elements:
This
field
specifies
the
maximum
number
of
element
descriptors
to
return.
If
the
allocation
length
is
not
sufficient
to
transfer
all
of
the
element
information,
the
target
transfers
all
the
information
that
can
be
completely
transferred;
this
is
not
an
error
condition.
CurData:
If
the
CurData
bit
is
set
the
library
shall
return
element
status
data
without
causing
device
motion.
If
the
CurData
bit
is
zero,
the
library
may
cause
device
motion
to
confirm
element
status
data.
Chapter
3.
Supported
SCSI
Commands
3-53