IntroductionThe MDFS server prints fatal errors to the printer that has been configured to receive system messages. Reports are printed if the error is fatal, even if you disabled reports. These reports are accompanied by the SYSTEM ERROR indicator, so you know it is important.
"ABEND" erorrsErrors looking like "ABEND xxxx" where xxxx is a hexadecimal number, such as '0B07', indicate that something is wrong with the SCSI hardware; typically when somebody switches off the harddisc before switching off the MDFS (whether accidental or intentionally).
Flashing light errorsIf the SYSTEM ERROR indicator flashes, it shows that something is wrong with the hardware and the MDFS cannot get as far as to print a report.
I currently only know of one of the status flashes:
6 short, 1 long Occurs at switch-on if the harddisc is not ready.
Errors that are usually non-fatalThe usual non-fatal (depending on your outlook!) errors are:
Instead, I shall list the disc and tape error numbers so you can better understand the messages that you may receive.
Harddisc errors (not Adaptec controller) Code Key Meaning 03 4 Write fault. Is power supply voltage out-of-limits? 04 4 Not ready (fatal) 06 4 Track 0 not found 10 3 ID ECC error 11 3 Uncorrectable data error 12 3 Not ID address mark 13 3 No data address mark 14 3 Sector not found 15 3 Seek error 17 1 Recovered read error by retries 18 1 Receovered read error by ECC 1A 5 Parameter overrun 1C 3 Error while accessing defect list 20 5 Invalid command 21 5 Illegal disc address 22 5 Illegal function 24 5 Illegal bit or byte in CDB (caused by bad SCSI ribbon cable) 25 5 Invalid LUN 26 5 Illegal bit or byte in parameter list (reason as for #24) 31 3 Format operation failed 32 3 No spare location available 40 4 RAM diagnostic failure 44 4 ROM diagnostic failure 80 4 DC motor failed to start 81 4 DC motor speed error +/- 1% 82 4 DC motor speed error +/- 5% 83 4 Index calibration failed Ex x Sense key = x, error code = 0 FD - Unknown status byte FE - Device busy (ie, executing command) FF - RSS error, or Bus jammed, or No BSY Tape errors 08 4 Drive Communication Error (can be caused by removing tape during access) 10 3 ID CRC error (usually bad or warn tape, or high levels of RFI) 11 3 Unrecoverable read error (causes as for #10) 15 3 Seek error (causes as for #10) 19 3 Defect list error 21 5 Illegal Logical Block Address 24 5 Illegal bit or byte in command block (check the ribbon cable is okay) 27 7 Tape is write protected 28 6 New cartridge ready for use 29 6 SCSI RESET has occurred 42 4 Power-on diagnostics failure A0 4 Bsckground noise error A7 4 Autoload error (try reinserting tape) A8 2 Cartridge autoloading (wait for it to stop) B0 2 No cartridge in drive Ex x Sense key = x, error code = 0 FD - Unknown status byte FE - Device busy (ie, executing command) FF - RSS error, or Bus jammed, or No BSY And for those of you using floppy drives... 08 Data CRC error Can't read data, try another drive 10 Sector not found Disc may need to be reformatted 18 ID CRC error Disc may need to be reformatted 28 Generic CRC error Similar to errors 8 and 18 40 Write protected You have write protected the disc, or changed discs without telling the MDFS 80 Not ready MDFS hardware error 81 Disc timeout Usually caused by removal of the disc accidentally or intentionally 82 Track 0 not found Disc / drive / cable fault 83 Track 0 stuck true Drive / cable fault