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tar to tape drive command

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Top Forums UNIX for Advanced & Expert Users tar to tape drive command
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Old 10-12-2010
You might want to use dd option "bs=65536" or the like so you write more than 512 bytes a record.

tar will embed nulls in his output even to a pipe to compress unless you use cpio or maybe find an option for tar to stifle most or all of the nulls.

The compress is faster than gzip but twice as big, generally, so gzip or gzip -9 or bzip2 is a better choice. Tape is usually slower than CPU even with bzip2. Play around with the compression level options (bzip2 has a bewildering set), and see what is fast enough. Usually, there is not much difference between gzip -7 and gzip -9, but your data and CPU may vary. Oh, look, rzip, 7zip, . . .

---------- Post updated at 04:48 PM ---------- Previous update was at 04:45 PM ----------

rzip(1): large-file compression program - Linux man page
gzip vs. bzip2 vs. rzip (by Jeremy Zawodny)

---------- Post updated at 05:05 PM ---------- Previous update was at 04:48 PM ----------

PS: If you sort the files from find by extension or file type, you get even better compression! The rzip site says it must have a flat file in -- worried about 32 bit VM space, I guess.
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LEARN ABOUT SUNOS

tcopy

tcopy(1)							   User Commands							  tcopy(1)

NAME

       tcopy - copy a magnetic tape

SYNOPSIS

       tcopy source [destination]

DESCRIPTION

       The  tcopy  utility copies the magnetic tape mounted on the tape drive specified by the source argument. The only assumption made about the
       contents of a tape is that there are two tape marks at the end.

       When only a source drive is specified, tcopy scans the tape, and displays information about the sizes of records and tape files.  If a des-
       tination  is  specified,  tcopy makes a copies the source tape onto the destination tape, with blocking preserved. As it copies, tcopy pro-
       duces the same output as it does when only scanning a tape.

       The tcopy utility requires the use of Berkeley-compatible device names. For example,

       example% tcopy /dev/rmt/1b /dev/rmt/2b

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWesu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mt(1), ioctl(2), attributes(5)

NOTES

       tcopy will only run on systems supporting an associated set of  ioctl(2) requests.

SunOS 5.10							    10 Mar 2000 							  tcopy(1)