> From: Jason Thorpe <thorpej@nas.nasa.gov>
> Date: Wed, 29 Oct 1997 19:37:31 -0800

> On Wed, 29 Oct 1997 14:54:56 -0800 
>  "Erik E. Fair" (Time Keeper) <fair@clock.org> wrote:
> 
>  >       tty            sd0             md0             md1             cpu
>  >  tin tout  KB/t t/s MB/s   KB/t t/s MB/s   KB/t t/s MB/s  us ni sy in id
>  >    1  213  7.14   3 0.02   0.00   0 0.00   0.00   0 0.00   7  9 14  0 69
[...]
>  > Are those "md0" and "md1" disks the memory file system? If so, why are
>  > they apparently not instrumented?
> 
> No, the "mfs" is different from the "memory disks".  The latter can hold
> any file system; they're just a disk.
> 
> I don't know if the "md" driver has the requisite disk_busy()/disk_unbusy()
> calls to instrument it.

Rather than add disk_busy()/disk_unbusy() to the "md" driver, I am
inclined to suggest that the "md" driver should not even show up in
the list of devices above, because it is not real hardware.

Gordon