129646: Exchange 2016 backup extremely slow

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Javier Saiz
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Joined: 2016-11-15
Posts: 3

Hi

I'm having a serious performance problem backing up Exchange 2016 running on a Hyper-V VM.

We are using Backup Advanced for Hyper-V (11.7.50064) and all VM's agents are also the same version.

When trying to backup Exchange DB (information store) backup speed oscilates between 460KB/s and 512KB/s as if there was a hard limit though when backing up other VMs on the same host we easily achieve sustained average speeds of 150-200MB/s and higher peaks to the same LTO-7 drive (SAS2 DAS). With a DB size of >90GB this means it would take over 24h to complete a backup. All host's storage is enterprise SSD based (SAS RAID5). 

On the  Exchange VM I see a constant disc read speed of 1-1.5MB/s when running the backup process.

Any idea or suggestion of where to start looking?

EDIT:

Backing up this complete Exchange VM without using agents (approx. 180GB) finishes in 18min using the same SW/HW.