error handling - Sense Key for ASC/ASCQ Numbers -


in scsi interface errors recognized concatenation of 3 numbers: sensekey + asc + ascq. asc/ascq pair description describes meaning of errors based on asc/ascq values. not asc/ascq pairs have meaning sense keys. how should know sense key returned each asc/ascq pair?

asc/ascq not tied sense key.

sense key main error code. asc , ascq additional sense code , qualifier. it's little tip answer wrong in i_t_l_q nexus.

so answer question - there no way know sense key returned each asc/ascq pair in general.

but there known "sense key" + asc + ascq combinations, because of operating systems implement error handling small subset of errors. unfortunately, can find subset inspecting source codes.

for example, in mac os x darwin kernel can additional_sense_code in ioscsiarchitecturemodelfamily. here example ioscsiblockcommands/ioscsiblockcommandsdevicepm.cpp, line 659:

// check sense key see if error group know how handle if  ( ( ( sensebuffer.sense_key & ksense_key_mask ) == ksense_key_not_ready ) ||        ( ( sensebuffer.sense_key & ksense_key_mask ) == ksense_key_medium_error ) ) {      // sensekey 02 ( not ready ) or 03 ( medium error ). check see     // if can      if ( ( sensebuffer.additional_sense_code == 0x04 ) &&           ( sensebuffer.additional_sense_code_qualifier == 0x02 ) )     {          // device requires start command before can tell if media there         if ( start_stop_unit ( request, 0x00, 0x00, 0x00, 0x01, 0x00 ) == true )         {              status_log ( ( "sending start_stop_unit.\n" ) );             serviceresponse = sendcommand ( request, 0 );          }          status_log ( ( "%s::drive not ready\n", getname ( ) ) );          iosleep ( 200 );         continue;      }      else if ( ( sensebuffer.additional_sense_code == 0x3a ) &&                ( sensebuffer.additional_sense_code_qualifier == 0x00 ) )     {          status_log ( ( "no media.\n" ) );         // no media present, return false         driveready = true;         mediapresent = false;      }      else     {          status_log ( ( "%s::drive not ready\n", getname ( ) ) );         iosleep ( 200 );         continue;      }  }

used sk+asc+ascq tupes:

  • 0x02/0x03, 0x04, 0x02 - not ready/medium error, logical unit not ready, initializing command required;
  • 0x02/0x03, 0x3a, 0x00 - not ready/medium error, medium not present.

as can see here asc/ascq pair used either 0x02 or 0x03 sense keys, , action take determined on asc/ascq pair, doesn't matter how asc/ascq pairs divided between sense keys.


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