Quantum 1200 Series DAT Autochanger Guía de usuario descargar pdf (Pagina 293)

SDLT 600 SCSI Interface Guide Chapter 4: SCSI Commands

81-81200-02 REV A01 January 2005 4-251

4.38.3 Download Microcode Mode (04h)

This mode uses buffer offsets to download the firmware image into the drive’s buffer in parts. The

firmware image must be downloaded in integral (whole) multiples of 8 KB. These commands do not

cause the new image to become active. A Download Microcode and Save Mode WRITE BUFFER

command must be issued for the image to become active.

The drive must not contain any tape medium before starting an image download. This is to safeguard

against accidentally starting a firmware update. If a tape cartridge is loaded when all or part of a

firmware image has been downloaded, the drive rejects another WRITE BUFFER command with

Download Microcode mode.

An error on a WRITE BUFFER command causes the drive to discard any downloaded image data.The

download must be restarted from the beginning.

4.38.4 Download Microcode and Save Mode (05h)

This mode downloads and saves the entire image at once, or downloads the image and saves it, or

starts a save operation after the image data has been downloaded using the Download Microcode mode

(04h) described above.

This mode of the WRITE BUFFER command causes the drive to verify the image data and update the

Flash EEPROM firmware area. During the reprogramming of the Flash EEPROM, the Write Protect

and Drive Status LEDs on the drive’s front panel blink. Also, while it is updating the EEPROM, the

drive disconnects from the network SCSI bus and does not respond until the update is complete.

When the Save operation completes successfully, the firmware restarts itself, causing the power-on

self-test (POST) to run. At that point, the drive generates two UNIT ATTENTION conditions:

POWER UP RESET and OPERATING CODE HAS CHANGED.

4.38.5 Write Data to Echo Buffer Mode (0Ah)

In this mode, the drive transfers data from the application client and stores it in an Echo Buffer. The

drive ignores the Buffer ID and Buffer Offset fields in this mode. Once a WRITE BUFFER command

completes successfully, the data is preserved in the Echo Buffer unless there is an intervening

command to write to the Echo Buffer or unless the drive is reset by any means.

AUTION If any type of power failure occurs during the actual

reprogramming of the FLASH EEPROM or if the

reprogramming fails before completion, the drive subsystem

becomes unusable and the drive must be replaced.

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Quantum 1200 Series DAT Autochanger Guía de usuario Pagina 293