User manual QUANTUM DLT2000

[. . . ] ® DLT2000/DLT2500/DLT2700 Cartridge Tape Subsystem Product Manual Date: 19 January 96 Order Number: 81-109132-03 Quantum reserves the right to make changes and improvements to its products, without incurring any obligation to incorporate such changes or improvements in units previously sold or shipped. You can request Quantum publications from your Quantum Sales Representative, or order them directly from Quantum. Publication Number: 81-109132-03 SERVICE CENTERS Quantum Service Center 715 Sycamore Avenue Milpitas, California 95035 Phone (408) 894-4000 Fax: (408) 894-3218 Quantum Gmbh Genferstrasse 4B 60437 Frankfurt am Main 56 Germany Phone: (49) 69-509-1080 Fax: (49) 69-509-10891 Quantum Asia-Pacific Pte. 50 Tagore Lane #b1-04 Singapore, 2678 Phone: (65) 450-9333 Fax (65) 452-2544 CompacTape DLT is a trademark of Quantum Corporation. is a trademark of Quantum Corporation. Copyright 1996 by Quantum Corporation. [. . . ] Unit Attentions will be created in the following circumstances: · · · · · · Power on BUS Reset Bus Device Reset message When the media may have changed asynchronously Another initiator changed the Mode Parameters A firmware (microcode) update has completed Two queued Unit Attentions are not unusual. For example, if a unit is powered up and a cartridge is loaded, Power Up and Not-ready to Ready Transition Unit Attentions are created. Due to a limited number of Unit Attention buffers, if an initiator does not clear Unit Attentions queued for it, at some point the tape device will stop generating new Unit Attentions for that I-L combination (but existing ones will be left queued). A LOAD command will not generate a Unit Attention for the initiator that issued the command, since the transition to ready is synchronous. 8. 2. 5 Behavior Around Power-On and SCSI Bus Reset · · · All device SCSI lines shall go to high impedance when the DLT2000 is powered off. The DLT2000 will not generate any spurious signals on the SCSI bus at power-on. Within 5 seconds of power on, and within 250 milliseconds (typically under 4 ms) after a Bus Reset, the DLT2000 will respond to SCSI bus selections and return appropriate, normal, responses. Tape motion commands will be returned with Check Condition status, Sense Key Not Ready, until the media has been made ready. The Hard Bus Reset option is implemented. Cached write data are flushed to the media upon bus reset. The media is rewound to BOP (Beginning of Partition, i. e. Beginning of Tape). · ·= · The DLT2000 will be able to recognize multiple bus resets in succession and bus resets of arbitrarily long duration. It will recover within the time limits specified above, following the last bus reset. DLT2000/DLT2700 Cartridge Tape Subsystem 8-3 DLT2000 SCSI Interface 8. 2. 6 Data Cache and Tape Write Interaction The DLT2000 contains a data cache that buffers blocks (records) until they are written. This section defines specific times that blocks shall be written to tape. A Mode Select parameter allows the data cache to be disabled (unbuffered mode). In this mode, every WRITE command will cause the data to be written to the media before the STATUS byte and the COMMAND COMPLETE message is returned to the host. Unbuffered mode is not recommended due to the poor performance that will result. __________________________NOTE ____________________________ Unbuffered mode is not recommended due to the poor performance that will result. ____________________________________________________________ The write data cache shall be written (flushed) to the media under the following circumstances: · · · · ·= When WRITE FILEMARKS command is issued with the immediate bit is set to zero. When a WRITE 0 FILEMARKS command is issued. Data in the cache longer than specified by the value of the Mode Parameter "Write Delay Time" shall be automatically written to media. When a nonwrite type media access command is received (for example, SPACE, READ, UNLOAD, . . ) When a SCSI Bus Reset or a Bus Device Reset message is received. 8. 2. 7 Other SCSI Functionality 1. [. . . ] a bad SCSI bus cable, improper termination, etc. ), an ECM or drive fault, or a firmware bug. D-2 DLT2000/DLT2700 Cartridge Tape Subsystem EEROM Resident Bugcheck and Event Logs Bits 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 / / / 48 95 96 Day Count 7 Up-Time Stamp 83 80 POH/PC Time Stamp Error Code 68020 Status Register 81 82 83 84 85 86 87 88 89 90 91 92 / / / 93 94 System Context 0 49 / / / 68020 A0-A7 Registers . / / / ISR Return Address 68020 PC Register 68020 MSP Register 68020 D0-D7 Registers . . SW Major Revision SW Minor Revision Figure D-2 Bugcheck LOG Packet Layout Table D-2 Bugcheck Error Codes Bugcheck Code E204 EE01 EE02 EE03 EE04 EE05 EE06 EE08 EE09 EE0D F202 Meaning and Possible Cause nexpected Timer2 Interrupt- possible ECM fault Spurious Non-Maskable Interrupt- possible ECM fault Spurious 8254 Timer Interrupt- possible ECM fault Spurious Level 5 interrupt (GPSP)- possible ECM fault Spurious Drive Comm Interrupt- possible ECM fault Spurious Loader Comm Interrupt- possible ECM fault Spurious Diag Comm Interrupt- possible ECM fault Watch Dog Expiration- SCSI bus may have lost termination, or ECM is constantly receiving non-tape commands. Spurious Power Fail Signal received- possible power supply fault Spurious Level 6 interrupt (GPSP)- possible ECM fault Loader time out-possible media loader fault DLT2000/DLT2700 Cartridge Tape Subsystem D-3 EEROM Resident Bugcheck and Event Logs D. 3 PO/ST failure packets PO/ST failure packets are stored whenever the Power-On /Self-Test logic detects a failure of any kind. [. . . ]