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5.1 In-band CLI Over the Fibre Channel
In-band Command Line Interface (CLI) configures and manages the Diamond Storage Array using
SCSI-based CLI commands over a Fibre Channel port connection.
In-band CLI allows a programmer to configure
the Diamond Storage Array while it is moving
data. Using a programmer's interface, CLI
commands as described previously in this manual
may be implemented.
In-band CLI is implemented as part of LUN 0. It
uses a different LUN than the array, and reports as
a Storage Enclosure Services (SES) device
(device type 0x0D).
LUN 0 is visible on all Fibre ports but is actually
a single unit. The default value for LUN 0 is 0x00.
LUN 0 must be reserved for each Write
Buffer/Read Buffer pair, using the SCSI Reserve
command to insure integrity of the in-band CLI
session.
1
An initiator (host) sends a SCSI Reserve
command to LUN 0.
• If LUN 0 is not reserved by another initiator,
LUN 0 is now reserved and ready to begin a
new CLI session.
• If the array configuration is reserved by a
different CLI session (i.e. serial or Telnet),
the in-band session will not be allowed to
modify the array configuration. If you try, the
results buffer of LUN 0 will return
Process X has the configuration
reserved.
ID of this session = Y
Ready.
2
The initiator issues a SCSI Write Buffer
command to LUN 0. A Write Buffer command
must be accompanied by an ASCII buffer
representing the CLI command string such as
set DiamondName Omega1
3
LUN 0 will execute the command line and
create feedback in the form of ASCII characters
into a buffer. This buffer is 8 KB and circular.
Retrieve the results by issuing a Read Buffer
command before issuing another Write Buffer
command.
19
ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual
4
A subsequent Write Buffer command will
execute the new command line and overwrite
the previous results in the buffer with new
results.
5
LUN 0 can be released by issuing a SCSI
Release command to the LUN after each
Write/Read Buffer pair, or multiple Write/Read
Buffer pairs.
Initiator (Host)
Reserve LUN 0
Write Buffer
LUN 0
bid 'AA'
"get Temperature"
Read Buffer
LUN 0
bid 'AA'
Release LUN 0
I/O details
The buffer sent to the Services LUN during the
data out phase of a Write Buffer command must
be
• ASCII data
• maximum 80 bytes length
• terminated with either a carriage return
character (0x0D), line feed character (0x0A) or
NULL character (0x00)
• Characters following the first carriage return
character, line feed character or NULL character
are ignored.
The buffer retrieved from the Services LUN
during the data-in phase of a Read Buffer
command will be
• ASCII data
• 8 KBytes (8192 bytes) in length
• terminated with a NULL character (0x00)
• Characters following the NULL character are
meaningless.
Diamond Array
return: "ok"
executes the CLI command,
stores output in buffer
return:
"Temperature=28C\r\n\Ready
.\r\n\0"
return: "ok"
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