Re: hard-disk via virtio-blk under windows (discard_granularity=0)

Hi: few years ago virtio-blk device was showing as hard-disk under windows. recent years the driver change the device to show as thin-provisioned disk. the change is good for ssd, but not so good for raw hard-disk. under windows server 2022 the default virtio-blk situation is quite bad, ssd trim is very slow. and defrag a bigger volume like 1TB harddisk will always show "memory not enough", even when the volume is empty. I found discussions to change the "discard_granularity" to make trim happy again. and libvirt support the syntax like below: <blockio discard_granularity='2097152'/> I also found if I can set "discard_granularity" to zero, then windows will recognize the device as "traditional hard drive" again and won't do unnecessary trim to it. I want to do this for years, but couldn't find a way to set it up like vitio-scsi's rotational parameter. the sad part is if I setup it under RHEL 9.4 with librirt 10.0 like below: <blockio discard_granularity='0'/> the line will just disappear when I close "virsh edit"

so I can only use complex format with "<qemu:override>" to set "discard_granularity='0'" I wonder if libvirt would be changed to accept "discard_granularity='0'" so the traditional hard-disk can be recognized under windows again.

or is there better ways to distinguish hard-disk/ssd/thin-disk for virtio-blk now?

Regards, tbskyd