Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 190)

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EXB-8505 Only: Using the Data Compression Page for 8500c

Compressed Format Tapes

For the EXB-8505, if your driver uses page format and you are

reading and writing 8500c compressed format tapes, follow these

steps to control compression:

1. When the tape is at LBOT, set the Density Code in the Block

Descriptor to 8Ch. This specifies 8500c format for the tape and

turns data compression on.

2. If you want, send this page to turn data compression off and

back on again when you write individual logical blocks.

To turn compression off, set the DCE bit to 0.

To turn compression back on, set the DCE bit to 1.

Note: The EXB-8505 monitors the compression ratio and

automatically switches to 8500 format when a logical block

expands. For this reason, you do not need to turn

compression on and off for individual logical blocks based on

the file type.

EXB-8505 or EXB-8205: Using the Data Compression Page

for 8200c Compressed Format Tapes

If you are using either the EXB-8505 or EXB-8205 to write and read

8200c format tapes, you do not need to send the Data Compression

Page. (In 8200c format, you cannot turn data compression on and off

independently of the tape’s position.)

However, if you must send this page for some reason, be sure that the

DCE and DDE fields exactly match what would be expected for the

tape format. That is, if the Density Code is 90h (8200c format), the

DCE and DDE bits must both be 1. Otherwise, the CTS will return

Check Condition status and set the sense key to Illegal Request (5h).

Field Definitions

Byte 00, Bits 5 through 0 - Page Code

The Page Code identifies the page being transferred. The valid value

is 0Fh (Data Compression Page).

10-34

EXB-8205 and EXB-8505

(Standard and XL)

510503

10 MODE SELECT (15h) and MODE SENSE (1Ah)

1 2 ... 185 186 187 188 189 190 191 192 193 194 195 ... 445 446

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Exabyte EXB-8205 Instruções de Operação Página 190

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