[Bug 212211] mrsas (4) does not allow smartctl to access S.M.A.R.T data from physical drive hidden under /dev/daX

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212211

--- Comment #14 from Terry Kennedy <terry-freebsd@glaver.org> ---
Created attachment 229667
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229667&action=edit
Requested info

I'm attaching the output from the two commands you requested. /dev/da0 is a
RAID5 of 4 SSDs. This is a PERC H730 (PCI card=0x1f491028 chip=0x005d1000) in a
Dell PowerEdge R730.

There seems to be partial support for passthru in the mrsas driver. I think I
noted this in my first comment on this PR.

There is quite a large amount of variation in the behavior of the various
MegaRAID drivers in FreeBSD. mfi will expose all of the physical member disks
as /dev/passX devices if the undocumented mfip module is loaded. One of the
other MegaRAID drivers (mpr, maybe?) has an interesting misfeature of only
exposing the last physical member disk of a volume as a /dev/passX device.

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