[OmniOS-discuss] Hung ZFS Pool

[Brian Hechinger]

So I decided to do some testing on the pool I have that is made up of a pair of Samsung 851 NVMe drives.

I’ve got it partitioned as I’m using part of it to test as SLOG against the “spinning rust pool”. Yes I know these aren’t ideal for this, but they will do for now.

I setup the other slices as a mirror and ran iozone against it.

It wrote fast. Really fast.

Then it stopped.

Now the pool seems to be wedged. At first I thought it might be the drives themselves, but I see them still functioning as SLOG just fine, so it’s not that I don’t believe.

root at basket1:/root# zpool status -v zoom
  pool: zoom
 state: ONLINE
status: One or more devices are faulted in response to IO failures.
action: Make sure the affected devices are connected, then run 'zpool clear'.
   see: http://illumos.org/msg/ZFS-8000-HC
  scan: none requested
config:

        NAME          STATE     READ WRITE CKSUM
        zoom          ONLINE       0     0     1
          mirror-0    ONLINE       0     0     6
            c4t1d0s1  ONLINE       0     0     6
            c5t1d0s1  ONLINE       0     0     6

errors: List of errors unavailable (insufficient privileges)
root at basket1:/root# ls /zoom/
iozone.DUMMY.0  iozone.DUMMY.10  iozone.DUMMY.12  iozone.DUMMY.14  iozone.DUMMY.2  iozone.DUMMY.4  iozone.DUMMY.6  iozone.DUMMY.8
iozone.DUMMY.1  iozone.DUMMY.11  iozone.DUMMY.13  iozone.DUMMY.15  iozone.DUMMY.3  iozone.DUMMY.5  iozone.DUMMY.7  iozone.DUMMY.9
root at basket1:/root# touch /zoom/hi

So read access appears to be ok. Writes are totally boned, however.  That touch just hangs forever.

So what do I need to do to provide you all with the information you need to diagnose this.

Thanks!

-brian