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@FreeBSD.org
Reporter: nwhiteh...@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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