Yes I am using LTO3 with LTO media tape is a HP C7973A Drive is a HP storageworks Ultrium 920 But this issue is the same with my lto2 and lto1 drive. I checked the tapes at work and they hold the correct amount of data when written with Backup Exec. so it must be a configuration issue. The performance is fine, if anything it is faster to write the tapes using tar than backup exec, it is just not compressing and I have no idea how to turn this on. (Although mt and mtst say it is already on). Is the tape density a good place to be looking? As far as I can tell it is indicating no compression. 0x44 on mty lto3 drive 0x42 on ltot and 0x40 on lto1 On 28 April 2016 at 17:08, Greg Freemyer <greg.freemyer@gmail.com> wrote:

On Thu, Apr 28, 2016 at 12:02 PM, Paul Groves <paul.groves.787@gmail.com> wrote:

...

I am using an LTO3 tape which is 400GB native (up to 800GB) so I would expect somewhere between these values. The directory contains many un-compressed media files so should be compressible, and it is only 368GB in size. It stops at around about 250-300GB mark by my estimation, which was my original problem. It isn;t even using anywhere near it's native size.

Paul,

Ar you sure you are using both LTO-3 drives and LTO-3 media?

If so, I have no idea why the tapes would not hold at least the 400GB of data.

Greg

-- Greg Freemyer www.IntelligentAvatar.net

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