User manual QUANTUM LTO-2 SCSI INTERFACE GUIDE 50004524 A

[. . . ] LTO-2 SCSI Interface Guide, 50004524 Rev. Quantum Corporation provides this publication "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability or fitness for a particular purpose. Quantum Corporation may revise this publication from time to time without notice. COPYRIGHT STATEMENT Copyright 2006 by Quantum Corporation. [. . . ] If medium removal is prevented and the medium is in the loaded position, then: · Pressing the Eject button on the front panel will be ignored. 2 · The LOAD UNLOAD command with the LOAD bit set to zero will result in a Check Condition status. The sense code is set to Illegal Request and the Additional Sense to Medium Removal Prevented (5302). All initiators that have prevented medium removal must enable it before the medium can be removed from the drive. A Bus Reset, Bus Device Reset message, Target Reset or Logical Unit Reset task management request, or power cycle will clear any previous medium removal prevented setting and allow medium removal. Table 135 PREVENT ALLOW MEDIUM REMOVAL Command Descriptor Block -- Data Format Bit Byte 0 1 2 3 4 5 7 6 5 4 3 2 1 0 Operation Code (1Eh) Ignored LUN Reserved Reserved Reserved Control Prevent Reserved LTO-2 SCSI Interface Guide 164 Chapter 2 SCSI Commands PREVENT ALLOW MEDIUM REMOVAL Command Table 136 PREVENT ALLOW MEDIUM REMOVAL Command Descriptor Block -- Field Descriptions Field Operation Code Ignored Logical Unit Prevent Bytes 0 1 Bits Description The Operation Code for Prevent/Allow Medium Removal is 1Eh. 5-7 The LUN field is vestigial from the SCSI-1 standard and is ignored. 11b = Not supported, no medium changer. 4 0-1 Reserved Control 5 All reserved bits must be 0. See Control Byte Format on page 29. LTO-2 SCSI Interface Guide 165 Chapter 2 SCSI Commands PREVENT ALLOW MEDIUM REMOVAL Command Completion Status 2 Table 137 shows the completion codes and messages for the PREVENT ALLOW MEDIUM REMOVAL command. Table 137 PREVENT ALLOW MEDIUM REMOVAL -- Completion Status Code 00h Message Good Status Description · The drive is ready to perform any appropriate command. · The drive remains in any previously set mode. · The tape position is not changed. 02h Check Condition Use the REQUEST SENSE command to retrieve status information. Possible Sense Keys are: Code Message Description 04h Hardware Error Parity error on the SCSI bus or drive hardware failure. Description Code Message 05h Illegal Request Unit Attention The Command Descriptor Block is invalid. The cartridge was changed, or the drive was reset prior to this command. 06h LTO-2 SCSI Interface Guide 166 Chapter 2 SCSI Commands READ Command READ Command 2 The READ command transfers one or more bytes or blocks from the drive to the Initiator beginning with the next block on tape. If the Fixed flag is clear and Transfer Length is not zero, then a single block of the length in Transfer Length is transferred. If the next block on tape is of this length or shorter then it is transferred to the initiator. If the next block is longer than this length, then only the length requested is returned and the logical position is set to after the record. If the length of the block was the same as the Transfer Length field, then good status is returned. If the length of the block was not the same as in Transfer Length and the Suppress Illegal Length Indicator (SILI) flag was clear, then Check Condition Status is returned. If the length of the block was not the same as in Transfer Length and the Suppress Illegal Length Indicator (SILI) flag was set, then Good status is returned. If the Fixed flag is set and the Transfer Length field is not zero and the Suppress Illegal Length Indicator (SILI) flag is clear, then a sequence of blocks of the currently configured block length is to be returned, the number of blocks being indicated in the Transfer Length field. If there is a sequence of blocks of this length on the tape, they are returned to the initiator with good status. If a block that is longer than the configured length is encountered before the sequence is complete, the blocks up to that block are returned followed by the configured length from the record that was too long and Check Condition status. If a block that is shorter than the configured length is encountered before the sequence is complete, the blocks up to that block are returned followed by all of that block and Check Condition status. The current position is set after the last block that was returned or partially returned. If the Transfer Length field is zero and the Suppress Illegal Length Indicator and the Fixed bit are not both set, then no action is taken. [. . . ] Worm control is in mode page 21, byte 4. If the calcutation between last eot and current is too big. 996h 997h 998h Servo Servo Servo 999h Servo 99Ah 99Bh 99Ch 99Dh Servo Servo Servo SCSI 99Eh SCSI 99Fh 9A0h Servo Servo LTO-2 SCSI Interface Guide 461 Appendix A Message Codes Status Name SRV_CMDPROC_UNEXPECTED_ MESSAGE_RESPONSE SRV_WW_INVALID_GET_ COMMAND SRV_CMDPROC_LOG_FULL SRV_NOT_ALLOW_TO_WRITE_TO _SVO_OFFTRK_REG SCSI_CLEANING_CARTRIDGE_CM _INVALID ASSERTION_HARD_FAILURE SRV_DAMPING_INPUT_FROZEN_ FOR_N_FIQ SCSI_INTERFACE_CDB_PHASE_ RETRIES_EXHAUSTED SCSI_INTERFACE_DATA_PHASE_ RETRIES_EXHAUSTED SCSI_INTERFACE_MAX_PARITY_ RETRIES SCSI_INTERFACE_RESELECT_ TIMEOUT SCSI_INTERFACE_BAD_MESSAGE_ RECEIVED SCSI_INTERFACE_BAD_IDENTIFY_ MESSAGE_RECEIVED SCSI_INTERFACE_MAX_IDE_ RETRIES Sense Key 9A1h 9A2h 9A3h 9A4h 9A5h 9A6h 9A7h Category Servo Servo Servo Servo SCSI General Servo Description Block writing of offtrk register. Hard error notification during interrupt context. Input to the servo module from the sensor is not changing for N FIQ count. [. . . ]