`<div dir="ltr"><div>Hi Brian,<br><br>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?<br><br>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.<br><br></div>Regards, Davide.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Dec 9, 2015 at 2:14 PM, Brian Hechinger <span dir="ltr"><<a href="mailto:wonko@4amlunch.net" target="_blank">wonko@4amlunch.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">So I decided to do some testing on the pool I have that is made up of a pair of Samsung 851 NVMe drives.<br>
<br>
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.<br>
<br>
I setup the other slices as a mirror and ran iozone against it.<br>
<br>
It wrote fast. Really fast.<br>
<br>
Then it stopped.<br>
<br>
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.<br>
<br>
root@basket1:/root# zpool status -v zoom<br>
pool: zoom<br>
state: ONLINE<br>
status: One or more devices are faulted in response to IO failures.<br>
action: Make sure the affected devices are connected, then run 'zpool clear'.<br>
see: <a href="http://illumos.org/msg/ZFS-8000-HC" rel="noreferrer" target="_blank">http://illumos.org/msg/ZFS-8000-HC</a><br>
scan: none requested<br>
config:<br>
<br>
NAME STATE READ WRITE CKSUM<br>
zoom ONLINE 0 0 1<br>
mirror-0 ONLINE 0 0 6<br>
c4t1d0s1 ONLINE 0 0 6<br>
c5t1d0s1 ONLINE 0 0 6<br>
<br>
errors: List of errors unavailable (insufficient privileges)<br>
root@basket1:/root# ls /zoom/<br>
iozone.DUMMY.0 iozone.DUMMY.10 iozone.DUMMY.12 iozone.DUMMY.14 iozone.DUMMY.2 iozone.DUMMY.4 iozone.DUMMY.6 iozone.DUMMY.8<br>
iozone.DUMMY.1 iozone.DUMMY.11 iozone.DUMMY.13 iozone.DUMMY.15 iozone.DUMMY.3 iozone.DUMMY.5 iozone.DUMMY.7 iozone.DUMMY.9<br>
root@basket1:/root# touch /zoom/hi<br>
<br>
So read access appears to be ok. Writes are totally boned, however. That touch just hangs forever.<br>
<br>
So what do I need to do to provide you all with the information you need to diagnose this.<br>
<br>
Thanks!<br>
<br>
-brian<br>
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</blockquote></div><br></div>
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