Windows VMs transfer speeds drop to 0 to/from HDD zfs mirrored pool

Hello,

When I'm using Windows 10/11 VMs, stored on an SSD zfs mirror pool, to transfer files to/from zfs HDD mirrored pool on the same Host, speeds frequently drop to 0 and hang there for a few minutes.

I don't have this issue with Ubuntu and linux VMs so I'm guessing it has something to do with Windows virtio drivers and zfs cache on the HDDs, but I can't put my finger on it. My solution at the moment is to rate limit the virtio network driver to 180 MB/s and the virtio hdd driver (for...

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