SCSI Log Sense Command

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.