[OmniOS-discuss] Hung ZFS Pool

[Davide Poletto]

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> 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
>   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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