adding second hdd cause LAN adapter configure change in guest OS

[WanpengQian]

When adding second HDD to vm, the slot number of LAN adapter will change because LAN adapter slot number is populated after HDD.
Recent FreeBSD version can add multi HDD to single AHCI HDD slot.
But if we adding second AHCI slot, also cause this problem.
guest OS will recognize as new LAN adapter. and have to configure IP in Windows GUI after that.

If we can force slot number in config file, that will solve this problem.

[WanpengQian]

Today I read the man 8 bhyve again, there is a config example below

          bhyve -c 4 \
             -s 0,amd_hostbridge -s 1,lpc \
             -s 1:0,ahci,hd:/images/disk.1,hd:/images/disk.2,\
           hd:/images/disk.3,hd:/images/disk.4,\
           hd:/images/disk.5,hd:/images/disk.6,\
           hd:/images/disk.7,hd:/images/disk.8,\
           cd:/images/install.iso \
             -s 3,virtio-net,tap0 \
             -l com1,/dev/nmdm0A \
             -A -H -P -m 8G

I have an idea of dirty workaround here.
Instead of adding second hdd, I modify the first hdd setting like below:

disk0_type="ahci-hd"
disk0_name="disk0.img,hd:/dev/ada2"

And it works.

[churchers]

In 1.2 you should be able to use the ahci_device_limit="8" option to configure vm-bhyve to put up to 32 disks on a single controller.

[WanpengQian]

can we set ahci_device_limit=8 as default value?

[churchers]

In the future I may look at using 8 unless the user overrides it. For now I have updated the Windows template so anyone using that for guests (as far as I'm aware only Windows ties the interface config to the slot) will get up to 8 disks before moving to the next slot.