Atto-technology Diamond Storage Array VT-Class Manual de usuario descargar pdf (Pagina 28)

ATTO Technology Inc. Diamond Storage Array Installation and Operation Manual

4.1 In-band CLI Over Fibre Channel

In-band Command Line Interface (CLI) configures and manages the Diamond-VT using SCSI-based

CLI commands over a Fibre Channel port connection.

In-band CLI allows a programmer to configure

the Diamond-VT 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 Diamond-VT, 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 Diamond-VT configuration is reserved

by a different CLI session (i.e. serial or

Telnet), the in-band session is not allowed to

modify the Diamond-VT configuration. If you

try, the results buffer of LUN 0 returns:

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

LUN 0 executes 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.

3 A subsequent Write Buffer command

executes the new command line and overwrites

the previous results in the buffer with new

results.

4 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.

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:

• ASCII data

• 8 KBytes (8192 bytes) in length

• terminated with a NULL character (0x00)

• Characters following the NULL character are

meaningless.

A CHECK_CONDITION,

INVALID_PARAMETER_IN_CDB is returned

Initiator (Host) Diamond-VT

Reserve LUN 0 return: “ok”

Write Buffer

LUN 0

bid ‘AA’

“get Temperature”

executes the CLI

command, stores

output in buffer

Read Buffer

LUN 0

bid ‘AA’

return:”Temperature=28

C\r\n\Ready.\r\n\0”

Release LUN 0 return: “ok”

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Atto-technology Diamond Storage Array VT-Class Manual de usuario Pagina 28

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