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8-2
SCSI REFERENCE 1014826
CHAPTER 8—LOG SENSE (4Dh)
8.2 WHAT YOU SEND TO THE LIBRARY
PPC (Parameter Pointer Control) – Byte 01, Bit 1
The value for the PPC field must be 0. This directs the library to return the
number of bytes that you specify in the Allocation Length field, beginning
with the parameter code specified in the Parameter Pointer field (bytes 05 and
06). The library returns the bytes in ascending order of parameter codes from
the specified log page. When both the PPC bit and the Parameter Pointer field
are set to 0 and the Allocation Length is sufficient, the library returns all
available log parameters for the specified log page to the initiator.
SP (Saved Parameters) – Byte 01, Bit 0
The value for this field must be 0, indicating that the library will perform the
LOG SENSE command and will not save log parameters.
PC (Page Control) – Byte 02, Bits 6 and 7
This field is always ignored and treated as if it contained the value 01h. This
indicates that the library will always return the cumulative values for any log
parameter requested. The library does not support any threshold values or
default cumulative values.
Page Code – Byte 02, Bits 0 through 5
The Page Code field allows you to identify the page that you want the library
to return. The value for this field must be one of the values specified in
Ta b l e 8 - 1 ; otherwise, the library terminates the command with Check
Condition status and sets the sense key to Illegal Request with the ASC set to
Invalid Field in CDB.
Table 8-1 Valid values for the Page Code field
Page Code Page Name Description
00h Supported Log Pages Returns a list of supported log pages.
2Eh TapeAlert Returns information from the library’s internal TapeAlert microcode.
This microcode constantly monitors the library for errors and
potential difficulties. When a problem is detected, the library sets a
flag on this page to identify the type of problem detected.
30h System Statistics Returns system statistics and retry counts.
33h Element Statistics Returns element statistics and retry counts.
34h Scan Retry Returns the number of times the library had to retry scanning the
cartridge at the specified element address.
36h Environment Returns environmental statistics
37h Command Failure Returns information on last command failures
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