Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 72)

Using the EXB-8505 to Write Compressed Data

The EXB-8505 writes compressed data in two different formats: 8200c

and 8500c. The default data format for the EXB-8505 is typically

8500c. However, an EEPROM option allows you to choose whether

the default data format is 8200, 8200c, 8500, or 8500c (see the “Default

write format” option on page A-5).

When writing compressed data with the EXB-8505, keep the following

rules in mind:

The EXB-8505 allows only one physical format on any one tape.

To write compressed data, you must write the tape entirely in

8500c format or 8200c format.

When writing to a new tape, you must use the MODE SELECT

command to specify the tape’s format at the logical beginning of

tape (LBOT). If you do not specify a format, the EXB-8505 writes

in its power-on default format (typically 8500c format).

You can use the MODE SELECT command to specify data

compression parameters. The parameters that you can specify

depend on whether your SCSI driver uses non-page format or

page format for the MODE SELECT command. If your SCSI

driver does not support MODE SELECT pages, the only

compression-related information you can specify is the Density

Code, which is located in the Block Descriptor (see Section 10.6).

If your SCSI driver supports MODE SELECT pages, you can

specify compression-related information with both the Density

Code and the Data Compression Page (Page Code=0Fh).

If you are writing in 8500c format and your SCSI driver supports

MODE SELECT pages, you can turn data compression on and off

at any point on the tape using the DCE (Data Compression

Enable) bit of the Data Compression Page. If your SCSI driver

does not support MODE SELECT pages, you cannot turn data

compression on and off.

If you are writing in 8200c format, you cannot turn data

compression on and off.

3-10

EXB-8205 and EXB-8505

(Standard and XL)

510503

3 Implementing CTS Operations

1 2 ... 67 68 69 70 71 72 73 74 75 76 77 ... 445 446

Sem comentários

Exabyte EXB-8205 Instruções de Operação Página 72