Johnny Billquist <[email protected]> wrote:
> This is obviously a limitation of the rmt protocol, which makes the
> assumption that all records are of equal length. Works for the standard
> Unix tools, which also tend to want to use tapes with a fixed record length.
From the FreeBSD 10.3 rmt(8) man page:
..... The protocol is comprised of the following commands,
which are sent as indicated - no spaces are supplied between the command
and its arguments, or between its arguments, and `\n' indicates that a
newline should be supplied:
......
Wcount\n
Write data onto the open device. The rmt utility reads count
bytes from the connection, aborting if a premature end-of-file is
encountered. The response value is that returned from the
write(2) call.
So each write to the tape can have a different record length.
All this reminds me how happy I am not to deal with tape drives any
more! I can't remember how many times I issued "mt fsf" without an
"&" not remembering the operation made the process incorruptible, and
resistant to CTRL-Z.
I always said tape drivers and boot roms always sucked because once
you got them working, you didn't want to touch them again!
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