[Bug 231569] ZFS per-disk status not showing "resilvering" during resilver

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=231569

            Bug ID: 231569
           Summary: ZFS per-disk status not showing "resilvering" during
                    resilver
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: spork at bway.net

I have some additonal background in the forums if there's any interest:

https://forums.freebsd.org/threads/weird-and-slow-zfs-resilver.67616/

Basically I got confused/worried about a resilver process because the data
presented in "zpool status" did not report the correct information.  Narrowing
it down, the problem is pretty simple:

In the configuration, where "zpool status" is showing me the warnings regrading
mismatched sector size, there is no indication which drives are being
resilvered:

[spork at trunk ~]$ zpool status
  pool: zroot
 state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Fri Sep 21 18:33:00 2018
        121M scanned out of 5.90T at 5.48M/s, 313h30m to go
        81.6M resilvered, 0.00% done
config:

        NAME            STATE     READ WRITE CKSUM
        zroot           ONLINE       0     0     0
          mirror-0      ONLINE       0     0     0
            gpt/zdisk0  ONLINE       0     0     0  block size: 512B
configured, 4096B native
            gpt/zdisk1  ONLINE       0     0     0  block size: 512B
configured, 4096B native
          mirror-1      ONLINE       0     0     0
            gpt/zdisk2  ONLINE       0     0     0  block size: 512B
configured, 4096B native
            gpt/zdisk3  ONLINE       0     0     0  block size: 512B
configured, 4096B native
          mirror-3      ONLINE       0     0     0
            gpt/zdisk5  ONLINE       0     0     0
            gpt/zdisk4  ONLINE       0     0     0
        logs
          gpt/zil0      ONLINE       0     0     0

errors: No known data errors

(label to device translation: zdisk0=ada0, zdisk1=ada1, zdisk2=ada2,
zdisk3=ada3, zdisk4=ada4, zdisk5=ada5, zil0=da0)

In the above output, the main status line indicates resilvering is in progress.
 This is correct - I have just replaced two drives, ada0 and ada3.  gstat shows
activity that should mostly confirm that the resilver is in progress:

[spork at trunk ~]$ gstat -pb
dT: 1.009s  w: 1.000s
 L(q)  ops/s    r/s   kBps   ms/r    w/s   kBps   ms/w   %busy Name
    0    205    154   3257    8.0     51    761    0.3   56.8  ada1
    1    228      0      0    0.0    228   3817    0.9   20.6  ada0
    0      0      0      0    0.0      0      0    0.0    0.0  da1
    0    195    152   5740   12.4     43    761    0.3   76.1  ada2
    0    332      0      0    0.0    331   5846    1.0   40.5  ada3
    0     58     15     41    9.2     43    761    0.5    9.4  ada4
    0     55     12     17    8.6     42    761    0.1    7.1  ada5
    0     15      0      0    0.0      7     91    0.5    0.5  da0

As you can see, the "zpool status" output is not indicating which drive(s) are
being resilvered.

Any ideas on debugging this?  I've never seen this behavior before.

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