Dell PowerVault TL4000 SCSI Reference Guide - Page 10

About, Ready, Condition - driver

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Immediately after the user command is finished the media changer switches to on-line mode. Note the media changer is continuous off-line when it is configured into Sequential Mode. The concept of control modes is introduced to explain the owner of the media changer. If the media changer is on-line then the SCSI bus has control of the loader. When the media changer is in OCP Control mode the OCP has control of the media changer. Described below are the possible control modes of the library: v SCSI Control mode (on-line) , in which the media changer is controlled by a SCSI driver issuing commands to move cartridges between the existing elements. This is the default control mode. v Sequential mode (off-line), in which the media changer is controlled by the media changers internal firmware. In this mode the media changer will automatically replace an ejected cartridge from the tape drive with another one from the media changers inventory. The media changer can be configured into Sequential mode by means of the OCP menu or RMU browser. v OCP / RMU / Console Control mode (off-line) , in which the media changer is controlled by a user. These control modes allow the user to send media access commands like move cartridges between existing elements. The media changer will return Not Ready status on media access SCSI command when the media changer is off-line. The media changer will accept media access SCSI commands when the media changer is on-line. About the Not Ready Condition The media changer reports Not Ready when it is unable to accept medium access commands. During the Not Ready reason the media changer will perform all non-media access commands as specified. The media changer is Not Ready when: v Its initialization routine is in progress v It is in sequential mode v It is off-line v A magazine is removed Not Ready reason Initializing Magazine removed Sequential Mode Off-line Sense code during 02/04/01 02/3B/12 02/04/8E 02/04/12 Sense info after Not Ready reason finished 06/28/00 02/04/01 (see note 1) 06/28/00 06/28/00 Note: When a magazine is inserted the media changer will automatically re-initialize. During this process the media changer shall return 02/04/01 status. When initializing is finished the media changer shall return a unit attention 06/28/00 before returning Ready status. The following non-media access commands are allowed during the Not Ready reason: Allowed commands during not ready state INQUIRY LOG SENSE MODE SENSE (6) MODE SENSE (10) PERSISTENT RESERVE IN 2-2 TL2000 and TL4000 SCSI Reference

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Immediately
after
the
user
command
is
finished
the
media
changer
switches
to
on-line
mode.
Note
the
media
changer
is
continuous
off-line
when
it
is
configured
into
Sequential
Mode.
The
concept
of
control
modes
is
introduced
to
explain
the
owner
of
the
media
changer.
If
the
media
changer
is
on-line
then
the
SCSI
bus
has
control
of
the
loader.
When
the
media
changer
is
in
OCP
Control
mode
the
OCP
has
control
of
the
media
changer.
Described
below
are
the
possible
control
modes
of
the
library:
v
SCSI
Control
mode
(on-line)
,
in
which
the
media
changer
is
controlled
by
a
SCSI
driver
issuing
commands
to
move
cartridges
between
the
existing
elements.
This
is
the
default
control
mode.
v
Sequential
mode
(off-line),
in
which
the
media
changer
is
controlled
by
the
media
changers
internal
firmware.
In
this
mode
the
media
changer
will
automatically
replace
an
ejected
cartridge
from
the
tape
drive
with
another
one
from
the
media
changers
inventory.
The
media
changer
can
be
configured
into
Sequential
mode
by
means
of
the
OCP
menu
or
RMU
browser.
v
OCP
/
RMU
/
Console
Control
mode
(off-line)
,
in
which
the
media
changer
is
controlled
by
a
user.
These
control
modes
allow
the
user
to
send
media
access
commands
like
move
cartridges
between
existing
elements.
The
media
changer
will
return
Not
Ready
status
on
media
access
SCSI
command
when
the
media
changer
is
off-line.
The
media
changer
will
accept
media
access
SCSI
commands
when
the
media
changer
is
on-line.
About
the
Not
Ready
Condition
The
media
changer
reports
Not
Ready
when
it
is
unable
to
accept
medium
access
commands.
During
the
Not
Ready
reason
the
media
changer
will
perform
all
non-media
access
commands
as
specified.
The
media
changer
is
Not
Ready
when:
v
Its
initialization
routine
is
in
progress
v
It
is
in
sequential
mode
v
It
is
off-line
v
A
magazine
is
removed
Not
Ready
reason
Sense
code
during
Sense
info
after
Not
Ready
reason
finished
Initializing
02/04/01
06/28/00
Magazine
removed
02/3B/12
02/04/01
(see
note
1)
Sequential
Mode
02/04/8E
06/28/00
Off-line
02/04/12
06/28/00
Note:
When
a
magazine
is
inserted
the
media
changer
will
automatically
re-initialize.
During
this
process
the
media
changer
shall
return
02/04/01
status.
When
initializing
is
finished
the
media
changer
shall
return
a
unit
attention
06/28/00
before
returning
Ready
status.
The
following
non-media
access
commands
are
allowed
during
the
Not
Ready
reason:
Allowed
commands
during
not
ready
state
INQUIRY
LOG
SENSE
MODE
SENSE
(6)
MODE
SENSE
(10)
PERSISTENT
RESERVE
IN
2-2
TL2000
and
TL4000
SCSI
Reference