Exabyte EXB-8205 Instruções de Operação descarregar pdf (Página 374)

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Writing Data for Directory Support

To write data to make use of the directory support feature and the

READ POSITION and LOCATE commands, follow these steps:

1. At LBOT, create a directory pad by writing “filler” data (data

that you do not intend to store) to tape. This reserves an area of

tape for the master directory that will list the location of the data

sets on tape.

The directory pad can be up to 10 MBytes in length. It should be

big enough to store the following:

The names of all the data sets you plan to store on the tape

(plan for the maximum number of data sets and assume that

each data set will use the longest allowable name).

Four bytes of READ POSITION data for each data set on

tape.

Note: Forbestresults,use1KByte(orsmaller)

fixed-length blocks to create the directory pad.

Important

When writing this pad in 8500c format, disable data

compression by setting the DCE bit on the Data

Compression Page of the MODE SELECT command

to 0. This ensures that the pad area is the correct

length. After writing this pad and the pad described

in the following step, you can set the DCE bit back to 1

to enable compression.

LBOT

DIRECTORY PAD

May 1994 EXB-8205 and EXB-8505

(Standard and XL)

B-5

Appendix B Directory Support

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