Tape Log Page (Sony Unique) - Sony AIT-SDX800 Product Specifications Manual

6.Command Specification

6.6.7. Tape Log Page (Sony Unique)

This page is a Sony unique page which provides information on the tape currently being used. This log cannot be
cleared and has the following format:
Bit 7
Byte
0 Reserved
1
2 (MSB)
3
4 (MSB)
5
6 DU (0)
7
8
3+m
This page is used to return Tape Log information to the host in a format which conforms to the LOG SENSE
command page format.
Supported Parameter Codes in this page are listed below along with their meanings:
Parameter Code
This information is contained within RAM in the Drive Controller. The log is updated as the tape is used.
The term 'current' refers to information generated during the current load of the tape; 'previous' refers to information
generated during the last tape load; 'total' refers to information generated during the life of the tape since it was first
initialized including the current load.
Use: An estimate of reading and writing performance can be made by the ratios of 'Total Groups Written' to
'Rewritten Tracks' and 'Groups Read' to 'C3 ECC Count'. An indication of tape degradation can be gained by
comparing these ratios for 'current', 'previous' and 'total' entries.
Any attempt to change this page using LOG SELECT will result in a CHECK CONDITION with a Sense Key of
ILLEGAL REQUEST. The current cumulative values will be returned regardless of the Page Control field in the LOG
SENSE CDB.
6-24
Table 6-21: Tape Log Page
6 5
DS (1) TSD (0) ETC (0)
Parameter Length (m)
Table 6-22: Tape Log parameter codes
001h Current Groups Written
002h Current Rewritten Tracks
003h Current Groups Read
004h Current C3 ECC Count
005h Previous Groups Written
006h Previous Rewritten Tracks
007h Previous Groups Read
008h Previous C3 ECC Count
009h Total Groups Written
00Ah Total Rewritten Tracks
00Bh Total Groups Read
00Ch Total C3 ECC Count
00Dh Load Count
4 3
Page Code (30h)
Reserved
Page Length (98h)
Parameter Code
TMC (00)
Parameter Value
Description
SONY AIT-3Ex drive SDX-800V series Ver.1.0
LOG SENSE
2 1 0
(LSB)
LBIN (0) LP (0)
Length
8
8
8
8
8
8
8
8
8
8
8
8
4