Hi Gal,

You can decrease the interval of checking the VM watermark, search for vm_watermark_interval in VDSM.
In the engine, you have the InitialSizeInBytes parameter when creating a snapshot for a VM.

Regards,

Shani Leviim

On Sun, Dec 13, 2020 at 3:35 PM Gal Villaret <gal.villaret@gmail.com> wrote:

Hi all,

Lately, I have been encountering an issue where VMs freeze during backups.
From what I can gather, this happens because some of the VMs sometimes perform large writes during the backup window and the snapshots dose not grow fast enough.
I use ISCSI storage with all VM disks preallocated.

Is there a configuration value I can change in order to increase the initial size of snapshots and also maybe change the watermark trigger for the expansion of snapshots?

Thanks.
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