On 2 April 2014 13:55, John Drescher <drescherjm AT gmail DOT com> wrote:
> On Wed, Apr 2, 2014 at 6:41 AM, Ben Laurie <ben AT links DOT org> wrote:
>> I recently swapped out my LTO-2 drive for an LTO-3 drive, but I'm
>> still using LTO-2 tapes.
>>
>> The current tape is still going strong and the latest backup says:
>>
>>   Last Volume Bytes:      607,752,327,168 (607.7 GB)
>>
>> which seems like quite a lot for a 200GB tape. Now, I realise the
>> drive can do compression, but with the old drive I never saw more than
>> ~400 GB on a single tape.
>>
>> Should I be suspicious? What exactly is Last Volume Bytes measuring?
>
> I have over 1TB on a few 200GB LTO2 tapes. This is due the the high
> compression of the dataset. LastVolumeBytes is measuring the total
> bytes stored on the tape.

To be clear: raw, uncompressed bytes (even if the compression was done
by Bacula)?

Also, as I say, I never saw more than about 400 GB on these tapes
before and the datasets shouldn't have changed radically - are LTO-3
drives better at compression?

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