AHCI disks have same serial number on Bhyve

[Peter Grehan]

Hi Ashutosh,

> FreeNAS uses disk serial number as identifier. We found that
> on Bhyve all AHCI controllers return common disk serial number i.e. ‘123456’.
> See attached screenshot. Due to this FreeNAS is not able to uniquely identify
> an AHCI disk when encryption support is enabled. Kindly let us know if an
> update to AHCI driver is in work to fix this issue.

  Known problem. The fix is to do what the virtio-blk emulation does, 
which is to use an md5 hash of the backing file/device name, and improve 
on that with an optional override similar to how MAC addresses are handled.

  It's on the todo list.

later,

Peter.