[Bug 195479] New: mpt(4) on VMware ESXi causes enormous number of SCSI busy errors

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195479

            Bug ID: 195479
           Summary: mpt(4) on VMware ESXi causes enormous number of SCSI
                    busy errors
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: nwhitehorn at FreeBSD.org

I'm using VMWare ESXi with raw device mappings. During heavy disk I/O, my logs
fill (*very* rapidly) with messages like the following:

(da14:mpt0:0:15:0): WRITE(10). CDB: 2a 00 19 6c b0 d8 00 00 28 00 
(da14:mpt0:0:15:0): CAM status: SCSI Status Error
(da14:mpt0:0:15:0): SCSI status: Busy
(da14:mpt0:0:15:0): Retrying command
(da12:mpt0:0:13:0): WRITE(10). CDB: 2a 00 19 85 46 e0 00 00 20 00 
(da12:mpt0:0:13:0): CAM status: SCSI Status Error
(da12:mpt0:0:13:0): SCSI status: Busy
(da12:mpt0:0:13:0): Retrying command
(da13:mpt0:0:14:0): WRITE(10). CDB: 2a 00 19 85 46 e0 00 00 20 00 
(da13:mpt0:0:14:0): CAM status: SCSI Status Error
(da13:mpt0:0:14:0): SCSI status: Busy
(da13:mpt0:0:14:0): Retrying command

I see these, simultaneously from every disk in the attached array, at ~ 1
minute intervals. I am assuming VMware is using this code as a signaling
mechanism rather than an error, but FreeBSD treats it as an error. If the retry
count is exceeded, IO will stop to the disks.

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