Re: [Mtx-general] OT: drive capacity (was AIT-3 Tape full with 42G)

[W B. <ws...@pa...>]

And...@wi... wrote:
> 
> > If you want to really know how many bytes you can put on tape, I
> recommend using dd. something like
> 
>                  /bin/yes | dd of=/dev/rmt/0c bs=1000
> 
> I tried this and its seemed take all day, but when I killed it, I got:
> 5188091+893263 records in
> 
> which  man dd says means:
>  f+p records in(out)
>            numbers of full and partial blocks read(written)
> 
> I'm guessing dd won't quit when the tape is full and so it was just
> hung/blocked on the write?
> 

dd will stop when it gets an I/O error at end of tape.

Pick a different source of input data, like:

tar -cvf - / | dd of=/dev/rmt/0c ibs=1024k obs=1024k

Wes