Thanks but in this case it was writing to a brand new tape. Should I have
run an erase before starting even on such a tape?
Thx
Rob
On Tue, 8 Oct 2024, 16:14 James Dutton, <james.dutton@???> wrote:
> On Tue, 8 Oct 2024 at 13:17, rmluglist2--- via Hampshire
> <hampshire@???> wrote:
> >
> > Hi all
> >
> >
> >
> > OK – I’m not having much luck with these tape backups – a 20Tb HDD is
> looking very favourable right now but I’ll press on for the moment…
> >
> >
> >
> > Does anyone know why a (LTO4) drive would report a tape being full when
> “it isn’t”? It wrote about 470Gb perfectly well on a completely blank
> tape then errored out with “No space left on device” on a brand new (in
> cellophane) blank tape. I know this thanks to du -h on the source data
> and then reading the recorded data back with dd which reports the file size
> for every file it reads back on the tape.
> >
> >
> >
> > Any ideas anyone?
> >
>
> Have you been writing incremental backups or missed an initialisation
> step that wipes an old tape and makes it ready for reuse.
> LTO4 writes in a serpentine pattern. I think LTO4 is 4 passes needed
> to fill the tape.
> Most backup software will keep track of which tape has been used in
> the past, and will not overwrite it unless told to.
> So, normally the backup just "append" data to the tape, without
> over-writing what went before.
>
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