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Full Discussion: tar to tape drive command
Top Forums UNIX for Advanced & Expert Users tar to tape drive command Post 302461899 by DGPickett on Tuesday 12th of October 2010 05:05:17 PM
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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TS(4)							     Kernel Interfaces Manual							     TS(4)

NAME
ts - TS-11 magtape interface SYNOPSIS
/sys/conf/SYSTEM: NTS ts_drives # TS11 /etc/dtab: #Name Unit# Addr Vector Br Handler(s) # Comments ts ? 172520 224 5 tsintr # ts11 driver major device number(s): raw: 8 block: 2 minor device encoding: bits 0003 specify TS drive bit 0004 specifies no-rewind operation bit 0010 ignored DESCRIPTION
The ts-11 combination provides a standard tape drive interface as described in mtio(4). The ts-11 operates only at 1600 bpi, and only one transport is possible per controller. FILES
/dev/MAKEDEV script to create special files /dev/MAKEDEV.local script to localize special files SEE ALSO
mt(1), tar(1), tp(1), mtio(4), ht(4), tm(4), dtab(5), autoconfig(8) DIAGNOSTICS
ts%d: no write ring. An attempt was made to write on the tape drive when no write ring was present; this message is written on the termi- nal of the user who tried to access the tape. ts%d: not online. An attempt was made to access the tape while it was offline; this message is written on the terminal of the user who tried to access the tape. ts%d: hard error bn%d xs0=%b xs1=%b xs2=%b xs3=%b. A hard error occurred on the tape at block bn; status registers 0-3 are printed in octal and symbolically decoded as bits. ts%d: addr mod 4 != 0. The address of a TS-11 command packet was not on an even longword boundary. BUGS
If any non-data error is encountered on non-raw tape, it refuses to do anything more until closed. The device lives at the same address as a tm-11 tm(4). 3rd Berkeley Distribution January 28, 1988 TS(4)
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