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.dut...@gmail.com> wrote: > On Tue, 8 Oct 2024 at 13:17, rmluglist2--- via Hampshire > <hampshire@mailman.lug.org.uk> 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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