On 03/31/2014 12:00 PM, Rupert Russell wrote: > Hi, > > shred -v /dev/st0 # where /dev/st0 is the drive in a multi tape carousel. > > This starts well with. > Pass 1/4 (random) 15MiB > Pass 1/4 (random) 41MiB > Pass 1/4 (random) 70MiB > Pass 1/4 (random).....etc > > But when the end of a 200GiB tape is reached in pass 1, 'shred' doesn't > appear to trigger a rewind or maybe wait for the tape to be rewound before > attempting to overwrite the data. > > > The final messages before and around the error are:- > > Pass 1/4 (random) 190GiB/190GiB 100% > > Pass 2/4 (random) > > Error writing at offset 1288. No space left on device. > > (The next line in my script then runs and unloads the tape.) > > Is this not rewinding the tape a bug or my mis-use of the 'shred' command?
shred(1) doesn't rewind the tape. It could issue an MTREW ioctl or something, though I suspect there are all sorts of ioctls to consider depending on plaftorm. I also see the `mt erase` command/ioctl which might suffice? If not then explicitly handling the tape like this might suffice? for i in $(seq 3); do mt -f /dev/st0 rewind shred -n1 /dev/st0 done thanks, Pádraig.
