On Wednesday, 12.03.2014 at 14:38 +0000, Dave Ewart wrote:
> Hello,
>
> Four years ago I deployed a pair of Tandberg LTO-5 Ultrium (SAS) tape,
> connected a Dell PowerEdge server via a Dell H200 SAS controller.
>
> At that time ran the amtapetype utility which produced this output:
>
> define tapetype Tandberg-LTO5 {
> comment "Tandberg LTO5 1500/3000, produced by tapetype prog (hardware
> compression off)"
> length 1410 gbytes
> filemark 0 kbytes
> speed 125762 kps
> }
>
> (That was created by an older version of AMANDA, which we were using at
> the time: probably from Debian/Lenny, which was version 2.5.2p1, I
> believe)
>
> These tapes are native 1.5TB and so that looks pretty reasonable. We've
> never used these tapes to their fullest capacity and all was fun and
> shiny until recently when the tapes reported "No space left on device".
> However, the concerning thing is that the tapes reported 'full' at less
> than what I was expecting as full capacity, just above 1.1TB in fact.
> This means that our backup space 'growth', which I had been assuming was
> only 75%/80% full is in fact at 100%!
>
> [...]
>
> What's going on? Why am I not getting to use the full capacity??Just to follow up on this one: I was able to purchase two, replacement identical tape drives and with the new drives the full tape capacity is available. I have therefore assigned the above anomaly to the old tape drives having worn heads or similar. Cheers, Dave. -- Dave Ewart [email protected] Computing Manager, Cancer Epidemiology Unit University of Oxford N 51.7516, W 1.2152
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