Dell PowerVault TL4000 SCSI Reference Guide - Page 17

Initialize, Element, Status, Range

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INITIALIZE ELEMENT STATUS WITH RANGE (37h) The INITIALIZE ELEMENT STATUS WITH RANGE command shall cause the media changer to check the specified elements for volume status and any other relevant status. This command enables the initiator to get a quick response from a Read Element Status command that may follow, and is useful after a power failure, if tape medium has been changed by an operator, or if subsystem configuration has changed. Byte 0 1 2 3 4 5 6 7 8 9 Bit 7 (MSB) (MSB) 6 LUN 5 4 3 2 Operation Code (37h) Reserved Starting Element Address Reserved Reserved Number of Elements Reserved Control 1 0 Fast Range (LSB) (LSB) Field descriptions: Range: A Range bit of zero indicates that all element addresses shall be checked and that the Starting Element Address and Number of Elements fields are ignored. A Range bit of one indicates that the series of elements beginning at the specified Starting Element Address for the specified Number of Elements shall be checked. If the Number of Elements field is zero, the range checked shall start with the Starting Element Address and continue through the last element address on the unit. Fast: A Fast bit of one indicates that the specified elements shall be scanned for media presence only. A Fast bit of zero indicates that the specified elements shall be scanned for all relevant status. Element Address: When the Range bit is set this field specifies the starting element address of the scan for the Initialize Elements with Range command. When the Range bit is not set the information in this field is ignored. Number of Elements: When the Range bit is set this field specifies the number of elements to scan during the Initialize Elements with Range command. The number of cartridges to scan should not exceed the maximum number of available storage slots taking in account the starting Element Address field. When the Range bit is not set the information in this field is ignored. Chapter 3. Supported SCSI Commands 3-3

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INITIALIZE
ELEMENT
STATUS
WITH
RANGE
(37h)
The
INITIALIZE
ELEMENT
STATUS
WITH
RANGE
command
shall
cause
the
media
changer
to
check
the
specified
elements
for
volume
status
and
any
other
relevant
status.
This
command
enables
the
initiator
to
get
a
quick
response
from
a
Read
Element
Status
command
that
may
follow,
and
is
useful
after
a
power
failure,
if
tape
medium
has
been
changed
by
an
operator,
or
if
subsystem
configuration
has
changed.
Bit
7
6
5
4
3
2
1
0
Byte
0
Operation
Code
(37h)
1
LUN
Reserved
Fast
Range
2
(MSB)
Starting
Element
Address
3
(LSB)
4
Reserved
5
Reserved
6
(MSB)
Number
of
Elements
7
(LSB)
8
Reserved
9
Control
Field
descriptions:
Range:
A
Range
bit
of
zero
indicates
that
all
element
addresses
shall
be
checked
and
that
the
Starting
Element
Address
and
Number
of
Elements
fields
are
ignored.
A
Range
bit
of
one
indicates
that
the
series
of
elements
beginning
at
the
specified
Starting
Element
Address
for
the
specified
Number
of
Elements
shall
be
checked.
If
the
Number
of
Elements
field
is
zero,
the
range
checked
shall
start
with
the
Starting
Element
Address
and
continue
through
the
last
element
address
on
the
unit.
Fast:
A
Fast
bit
of
one
indicates
that
the
specified
elements
shall
be
scanned
for
media
presence
only.
A
Fast
bit
of
zero
indicates
that
the
specified
elements
shall
be
scanned
for
all
relevant
status.
Element
Address:
When
the
Range
bit
is
set
this
field
specifies
the
starting
element
address
of
the
scan
for
the
Initialize
Elements
with
Range
command.
When
the
Range
bit
is
not
set
the
information
in
this
field
is
ignored.
Number
of
Elements:
When
the
Range
bit
is
set
this
field
specifies
the
number
of
elements
to
scan
during
the
Initialize
Elements
with
Range
command.
The
number
of
cartridges
to
scan
should
not
exceed
the
maximum
number
of
available
storage
slots
taking
in
account
the
starting
Element
Address
field.
When
the
Range
bit
is
not
set
the
information
in
this
field
is
ignored.
Chapter
3.
Supported
SCSI
Commands
3-3