[Bug 239801] mfi errors causing zfs checksum errors

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239801

Hiroki Sato <hrs at FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|Open                        |In Progress

--- Comment #5 from Hiroki Sato <hrs at FreeBSD.org> ---
(In reply to Daniel Mafua from comment #4)

Thanks for your report.  I have several other systems which are suffering from
the same problem.  Here is information about this problem which I got so far:

* mfi(4) can report I/O errors which is not related to an actual hardware
failure
  after upgrading FreeBSD to 11.3 or 12.0.

* The error does not depend on ZFS while ZFS is very likely to report
  checksum errors of the zpool.  On a system using UFS, the I/O error
  can cause a system panic, boot failure, or something fatal.

* It seems that the I/O error depends on a specific firmware version.  Some
older
  firmware versions work fine even with mfi(4) on 11.3 and 12.0. 

* If the device is also supported by mrsas(4), switching to it will solves
  the error.  Note that it will cause an incompatibility issue---mfi(4) uses
  /dev/mfi* device nodes for the attached drives and mfiutil(8) as the userland
  utility.  mrsas(4) uses /dev/da* and a vendor-supplied utility such as
  megaCli instead.

I am investigating what caused this regression but a workaround is to use
mrsas(4) instead of mfi(4) by specifying hw.mfi.mrsas_enable="1" at boot time.

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