Slow backup after enabled Windows deduplication

[ManuelRighi]

Hello,
I have B&R v. 7.0.0.839 on Physical server with Windows Server 2012 R2.
I enable Windows Server deduplication on my backup server, in the drive where veeam save its backups.
After that, a few days after that windows has completed deduplication all the data, the speed of veeam backup is very slow (than before when deduplication windows was not active).

Can you help me ?
Manuel

[foggy]

Manuel, what are the bottleneck stats the job is showing? What backup mode it is set for (forward or reversed incremental)? What is the "Deduplicate files older than" setting for the target volume?

[ManuelRighi]

Hi,
bottleneck is Source.
Backup mode is reversed incremental.
Windows deduplicates files older than 3 days.

[veremin]

Can you provide the full bottleneck statistics with the percent distribution? How often the backup is being performed? Thanks.

[ManuelRighi]

where can I find this value Eremin ?

[veremin]

Double-click a job -> Show details -> Load. Thanks.

[ManuelRighi]

I have many VM's on one backup job.
Some VM have these uses:

Busy: Source 35% > Proxy 26% > Network 27% > Target 96%
Busy: Source 4% > Proxy 24% > Network 25% > Target 99%
Busy: Source 72% > Proxy 27% > Network 24% > Target 81%
Busy: Source 13% > Proxy 29% > Network 25% > Target 49%
Busy: Source 15% > Proxy 33% > Network 83% > Target 50%
Busy: Source 16% > Proxy 30% > Network 0% > Target 99%


Backup job is being performed once a day, every day

[foggy]

Well, the main idea here is that with reversed incremental mode, changes are being injected into the existing VBK file, which is already deduplicated. This significantly affects write speed (target being the bottleneck tells that writing data to the storage is the issue).