IBM Ultrium Internal Tape Drive T200, Справочное руководство

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Note: For this command, a megabyte is equal to 1 048 576 bytes. As an example,
a value of 17487h in Parameter 3 is equal to 95 367 megabytes, which is
equal to 100 000 000 000 bytes.
Data Compression Log
The Data Compression Log Page Code is 32h. Parameter byte fields 0 and 1 are 2
bytes long. Parameter byte fields 2 through 9 are each 4 bytes long.
The supported fields are listed in Table 25.
Table 25. Data Compression Log Parameters
Parameter Description Length DU LP LBIN
0 Read Compression
ratio
×
100
2 0 0 0
1 Write Compression
Ratio
×
100
2 0 0 0
2 Megabytes transferred
to server 4 0 0 0
3 Bytes transferred to
server 4 0 0 0
4 Megabytes read from
tape 4 0 0 0
5 Bytes read from tape 4 0 0 0
6 Megabytes transferred
from server 4 0 0 0
7 Bytes transferred from
server 4 0 0 0
8 Megabytes written to
tape 4 0 0 0
9 Bytes written to tape 4 0 0 0
Parameters 2 through 9 occur as pairs that represent a large number of bytes
transferred. The first 4-byte parameter represents the number of whole megabytes
transferred, rounded to the nearest megabyte. The second 4-byte parameter
represents the difference between this number of megabytes and the actual number
of bytes. This may be a signed quantity.
This data may be reset, but may not be written.
Chapter 2. Command Support
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