SCSI Log Sense Command

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The SCSI Log Sense command is used to obtain current data from log pages in a SCSI target device. The CDB structure for the Log Sense command is:

The special parameter fields in the CDB have the following meaning:

  • PPC - Parameter Pointer Control - if this is one then the target returns a log page with parameter code values which have changed since the last Log Select command or Log Sense command. If PPC is zero then all bytes are returned.
  • SP - Save Parameters - if this is one then the target should save all saveable log parameters to a non-volatile memory or media area.
  • PC - Page Control - this indicates which type of values should be returned:
    • 00 - Current Threshold Values
    • 01 - Current Cumulative Values
    • 10 - Default Threshold Values
    • 11 - Default Cumulative Values
  • Parameter Pointer indicates the first parameter code to be returned.
  • Allocation Length in bytes

If the Parameter Pointer is zero and the PPC is zero and the Allocation Length is high enough then all parameters are returned.

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