We had issues in the past .. that the syslog host killed all VMs, with I/O .. so we limited:
ostype: l26
scsi0: pve-container:vm-105-disk-0,size=25G,ssd=1
scsi1: pve-container:vm-105-disk-1,discard=on,mbps_wr=40,size=2789377M,ssd=1
we had no issues anymore .. since years .. but the OS was...