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.

1An 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.

2The 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

3LUN 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.

4A subsequent Write Buffer command will execute the new command line and overwrite the previous results in the buffer with new results.

5LUN 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)

Diamond Array

 

 

Reserve LUN 0

return: “ok”

 

 

Write Buffer

executes the CLI command,

LUN 0

stores output in buffer

bid ‘AA’

 

“get Temperature”

 

 

 

Read Buffer

return:

LUN 0

”Temperature=28C\r\n\Ready

bid ‘AA’

.\r\n\0”

 

 

Release LUN 0

return: “ok”

 

 

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.

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ATTO Technology S-Class manual In-band CLI Over the Fibre Channel, Details, Initiator Host Diamond Array
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S-Class specifications

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