John Drescher wrote:
>> I got 80MB/s, admittedly still some way off the supposed 120MB/s.
>>
> I believe this assumes a 2:1 compression rate which is highly
> dependent on your data. I typically get 1.5:1 with my LTO2 drives and
> my data.

I believe the 120MB/s is the raw speed, 240MB/s is the compressed speed.

Since all I was backing up was lots of zeros (from /dev/zero) it should 
have compressed that quite well anyway :)

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