LTO3 library speed

[arie_5]

I would like to know if someone is using LTO3 and how fast can he backup?
I bean told that LTO3 is too fast for single thread writing. I need to have multiplexing in order to feed the tape at 80MBps.

[Leif Halvarsson_2]

Hi,
I have not yet used any LTO3 device but have done a lot of benchmarks with LTO2.
I belive you are right, in the "real world" it will be very hard to feed one LTO3 drive using only one data stream but, it may be possible if:
- Unix backup.
- Fast CPU.
- Very fast disk system.
- Large files or rawdisk backup.

[arie_5]

tody i am using 4 lto2 tape and the 100baseT network is limiting me. i started to migrate to 1000baseT and the test on LTO2 show i get the maximum 2.5 GBpm.

[Kurt Beyers.]

Arie,

In a new setup I reach a throughput of 100 GB/hour in a SAN based file system backup to LTO3 drives with DataProtector.

So the throughput is about the same as with a LTO2 drive, the metadata is probably slowing down the process.

The 80 MB/s will be very hard to reach even with a high concurrency.

best regards,
Kurt