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

2

0

0

0

 

ratio × 100

 

 

 

 

 

 

 

 

 

 

1

Write Compression

2

0

0

0

 

Ratio × 100

 

 

 

 

 

 

 

 

 

 

2

Megabytes transferred

4

0

0

0

 

to server

 

 

 

 

 

 

 

 

 

 

3

Bytes transferred to

4

0

0

0

 

server

 

 

 

 

 

 

 

 

 

 

4

Megabytes read from

4

0

0

0

 

tape

 

 

 

 

 

 

 

 

 

 

5

Bytes read from tape

4

0

0

0

 

 

 

 

 

 

6

Megabytes transferred

4

0

0

0

 

from server

 

 

 

 

 

 

 

 

 

 

7

Bytes transferred from

4

0

0

0

 

server

 

 

 

 

 

 

 

 

 

 

8

Megabytes written to

4

0

0

0

 

tape

 

 

 

 

 

 

 

 

 

 

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 25

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IBM T200F manual Data Compression Log Parameters

T200F, T200 specifications

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