Copy from Datadomain to tape is super slow

[NynBack]

Hi everyone!

In my company we have a Dell Datadomain (3300) and a LTO-9 tape unit.

When we run the tape job, it only copies at 90 MB/s. When we do the backup job to the DD3300 repository, it works at 300-400 MB/s.

The LTO is connected via FTTH (4 Gbps)

Can someone help me with this?

Thank you!

[Mildur]

Hello Nyn

Welcome to the forum.
From my experience thats kind of expected. Read performance (your tape job) with deduplication appliances (not limited to Data Domain) is generally much lower than writing data to it (your backup job).

This happens because, during a read operation, the appliance needs to reconstruct each backup file from deduplicated blocks, which can take time depending on the appliance, and then transfer it to the Veeam gateway server and subsequently to the Veeam tape server.

Have you tried restoring an entire VM from your Data Domain? It's likely that the restore speed will be similar, around 90 MB/s.

Can someone help me with this?

If you're looking for assistance with this issue, I recommend reaching out to the Veeam customer support team.
They can help ensure that everything is functioning as expected.

Best,
Fabian

[NynBack]

Thank you Fabian, I didn't know this was normal behavior.

I think I will get stuck with this system for a while, since in Veeam we don't have the option to write to tape a backup directly.

Best Regards!

[Dima P.]

Hello Nyc,

since in Veeam we don't have the option to write to tape a backup directly.

That depends on the data - for files or objects you can use file to tape jobs, for image-level backup the only way is via disk to disk to tape approach. Thank you!