HP LTO 4 SCSI, LTO 4 FC, LTO 4 SAS manual SCSI command

•If the drive receives a valid ACI 4.1 format Set Drive Configuration command.

•An ACI 4.2 or ACI 4.3 format Set Drive Configuration command with the ACI Major/Minor Version fields set to 41h.

•The tape drive is reset. Fibre Channel tape drives do not support ACI 4.0 compatibility mode, so they will only accept ACI version 4.1 and later commands.

•An SAS tape drive will remain in ACI 4.2 compatibility mode until it receives a valid ACI 4.2/4.3 format Set Drive Configuration command with the ACI Major/Minor Version fields set to a new and valid ACI version (which is 43h). It will then respond with the appropriate ACI version RDATA. The drive will return to ACI 4.2 compatibility mode in the following circumstances:

•If it receives an ACI 4.2 or ACI 4.3 format Set Drive Configuration command with the ACI Major/Minor Version fields set to 42h.

•If the drive is reset. SAS tape drives do not support ACI 4.0 or ACI 4.1 compatibility mode, so they will only accept ACI version 4.2 and later commands.

HP LTO tape drives support all ACI versions later than their default ACI compatibility mode version. For example, Fibre Channel drives default to ACI 4.1 compatibility mode but also support ACI version 4.2 and ACI 4.3, which can be selected using the appropriate format ACI Set Drive Configuration command.

Notes

An HP LTO tape drive supports a two-step initialization sequence. The first step behaves as described above; the drive goes through the first step of the initialization sequence and then begins to send the <ENQ> character at 10-second intervals. The drive sends the <ENQ> character within 500 ms of the power-on, drive reset, ACI reset or completion of firmware upgrade.

Once the drive sends the first <ENQ> character, it will begin the second step of initialization. This may take several minutes to complete as it includes rewinding the tape and, optionally, unthreading it, if the drive contains a seated cartridge with threaded media.

During the second step of initialization, the drive will respond to all ACI commands, except Get Drive Info, Get Error Info and some Send SCSI commands with BUSY status. The drive will respond normally to the Get Error Info command. It will respond normally to the Get Drive Info command except that every byte of the Manufacturing Data Code and Serial Number fields will contain the value FFh. During initialization the drive supports SCSI commands as in the following table. It responds with BUSY status to commands that are unsupported:

	SCSI command	Supported during initialization
	INQUIRY	Yes
	LOG SELECT	No
	LOG SENSE	Yes
	MODE SELECT	No
	MODE SENSE	No
	READ ATTRIBUTE	No
	RECEIVE DIAGNOSTIC REPORT	No
40 Supporting Ultrium features		HP restricted