# How long for DPM to perform a backup to VTL?

• ### Question

• Hello,

Can anyone advise how to calculate the duration for a DPM backup (include MBS and dedup)

Using 10TB as the dataset and using 1GB bandwidth

How long for a 1st full backup?

How long for an incremental daily backup?

How long for a weekly backup?

How long for a monthly backup?

Many thanks.

Regards Peter

Wednesday, June 20, 2018 10:39 AM

### All replies

• Hi!

I'm afraid this is very difficult to calculate or estimate, as speeds vary a lot, and there's other things going on in the network always, which means you cannot keep a constant bandwidth speed.

The best way to get an estimation is to follow up the backup trend and calculate an average of that.

But doing a VERY simple calculation:

Data

• 10TB (10000GB or 10240000MB)

Bandwidth

• 1GBbps (1000Mbps ~125MB/s)

10240000MB ÷ 125MB = 81920

So it will take 81920 seconds to transfer 10TB of data at full speed.

To get this in minutes: 81920s ÷ 60 = 1365.33min

To get this in hours: 1365.33...min ÷ 60 = 22.75...h

Best regards,
Leon

Blog: https://thesystemcenterblog.com  LinkedIn:

Wednesday, June 20, 2018 1:28 PM
• Thanks for the example.

That shows the transfer of data estimate but i am wondering about the actual DPM compression and dedup process and how long that takes, as i understand it does that before it transfers it out to the storage (disk).

Any idea how to calculate the DPM process?

Thanks

Regards Peter

Friday, June 22, 2018 1:44 AM
• Hi,

we are running quite a lot DPM servers with VTLs.

It is not really possible to calculate that.

There are so many points that can have an affect on this:

- speed of storage
- speed of VTL
- DPM does not dedup on Tape (DPM does not dedup anyway)
- type / amount of files
- configuration of DPM Server / OS

...

regards

/bkpfast

My postings are provided &quot;AS IS&quot; with no warranties and confer no rights

Tuesday, June 26, 2018 7:00 AM