[Bug 211852] Unsafe shutdowns on Intel 750 SSD

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211852

            Bug ID: 211852
           Summary: Unsafe shutdowns on Intel 750 SSD
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: rajil.s at gmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hello,

I am using a Intel 750 SSD AIC as an SLOG. Each time I poweroff the server the
'Unsafe Shutdowns' counter increments for the SSD. It seems that the Shutdown
command is not being sent to the SSD.



The smart data is as follows:

=== START OF SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

SMART/Health Information (NVMe Log 0x02, NSID 0xffffffff)
Critical Warning:  0x00
Temperature:  37 Celsius
Available Spare:  100%
Available Spare Threshold:  10%
Percentage Used:  0%
Data Units Read:  494 [252 MB]
Data Units Written:  468,568 [239 GB]
Host Read Commands:  5,865
Host Write Commands:  6,246,687
Controller Busy Time:  0
Power Cycles:  11
Power On Hours:  352
Unsafe Shutdowns:  8
Media and Data Integrity Errors:  0
Error Information Log Entries:  0

Error Information (NVMe Log 0x01, max 64 entries)

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