deblock(1)
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deblock Command
change blocking size
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SYNTAX
deblock [-i] [-o] [-f]
DESCRIPTION
Deblock reads from standard input and writes to standard output.
This utility is used to change the blocking factor between input
and output. An intermediate buffer stores bits of information to
be sent to output. The user selects the size of this buffer.
If this buffer is sufficiently large, limited streaming is
possible on streamer tapes.
The available options for deblock are as follows:
-i<size> Input buffer (record) size in bytes. The default is
5120.
-o<size> Output buffer (record) size in bytes. The default is
1024.
-f<size> The factor used to determine the intermediate buffer
size. The intermediate buffer size is determined by
multiplying the size of the input buffer by the value
of -f and then adding the size of the output buffer.
To facilitate streaming of tapes, reads with buffer size
specified by the "i" option are performed until the intermeditate
buffer is filled. When the intermediate buffer fills, writes
with buffer size specified by the "o" option are performed until
the intermediate buffer is empty. The "f" option sets the
intermediate buffer size.
EXAMPLE
The following command sequence reads a file, compresses it, and
writes it to a tape in cpio format. If the tape is a streaming
tape, it will stream during the time that the intermediate buffer
is being output. The output buffer size is selected for
streaming of B media. The intermediate buffer size is 540,672
(512 * 1024+16384).
echo foo|cpio -ob|compress|deblock -i512 -o16384 -f1024
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deblock(1)
SEE ALSO
dd(1)
DG/UX 4.00 Page 2
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