# [OmniOS-discuss] Hung ZFS Pool

Brian Hechinger wonko at 4amlunch.net
Wed Dec 9 14:04:36 UTC 2015

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    Sorry, typo-ed that.

    These are SM951

    -brian

    > On Dec 9, 2015, at 9:02 AM, Davide Poletto <davide.poletto at gmail.com> wrote:
    >
    > Hi Brian,
    >
    > a side note: are you sure that your Samsung 851 drive (I think you're referring more specifically to the Samsung PM851 SSD Drive) supports the NVMe interface standard?
    >
    > I think it doesn't...at least looking at its released interface's specifications: it uses SATA 3 (6.0 Gbps) interface instead of the NVMe 1.1 used by "disks" like the Samsung PM/SM951, PM1725, XS/SM1715 or the PM/SM953...just to name some.
    >
    > Regards, Davide.
    >
    > On Wed, Dec 9, 2015 at 2:14 PM, Brian Hechinger <wonko at 4amlunch.net <mailto:wonko at 4amlunch.net>> wrote:
    > 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 <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
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