06-12-2008
Appending files to a tape drive
I've starting playing with a tape drive for the first time. Its a new one, an IBM Ultrium LTO 4. After initially copying a file to the tape with tar cvf /dev/st0 /root/dummy, all subsequent files appended take an increasing amount of time with tar rvf /dev/st0 /root/dummyX. Is it normal for each appended file to take longer than the previous? Also, anyone have an idea of an optimal block size?
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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)