> On Jan 3, 2018, at 5:22 PM, Winston Sorfleet <[email protected]> wrote: > > On 2018-01-03 05:46 PM, Chris Miller wrote: >> Hi Jean-Louis, >> A vtape do not reserve the space, it only use the space of the dump you put >> on it. >> The vtape size should be the maximum size of any days or larger, they could >> be 120GB or 2TG, the result will be the same. >> Some vtape will use 5GB, some will use 120GB. >> Thanks very much. That is quite helpful. >> >> Is it possible to re-use a vtape for several successive backups? If the >> vtape were twice the size of a level 0 backup, then the level 1 backups >> would be appended, but the next level 0 would be too large and would trigger >> a new tape. >> >> Additionally, How do I configure larger cycles, meaning, I will use 150GB >> each week, and 2TB can hold 13 weeks. How do I tell Amanda that after 13 >> weeks, she should start over by deleting the oldest vtape? > > That's exactly what it will do, unless you explicitly tell Amanda that a tape > is out of commission. So, just like your traditional robot, it will cycle. > > HOWEVER, note that Amanda will not write to a tape that has been recently > written, whether it's 5 GB or 150 GB. It does not append to tapes (barring > some painful and unnecessary manual configuration, that is). So, you're > better off using small vtapes. Because if it only writes 5 GB to 150 GB in a > 2 TB NAS, that remaining 145 GB is unavailable to Amanda until that vtape > comes up for overwriting.
Except that we were just assured that it only uses 5G if that’s how much data you have. The 145G isn’t unavailable. You just “oversubscribe” the disk, since you know most of the backups will only be 5G. Still doing tapes myself, but I’m pretty sure I understood that much. Deb Baddorf Fermilab > > >> >> Thanks for the help, >> -- >> Chris. >> >> V:916.974.0424 >> F:916.974.0428 > > >
