`<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Sorry, typo-ed that.<div class=""><br class=""></div><div class="">These are SM951</div><div class=""><br class=""></div><div class="">-brian</div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Dec 9, 2015, at 9:02 AM, Davide Poletto <<a href="mailto:davide.poletto@gmail.com" class="">davide.poletto@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="">Hi Brian,<br class=""><br class="">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 class=""><br class="">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 class=""><br class=""></div>Regards, Davide.<br class=""></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Dec 9, 2015 at 2:14 PM, Brian Hechinger <span dir="ltr" class=""><<a href="mailto:wonko@4amlunch.net" target="_blank" class="">wonko@4amlunch.net</a>></span> wrote:<br class=""><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 class="">
<br class="">
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 class="">
<br class="">
I setup the other slices as a mirror and ran iozone against it.<br class="">
<br class="">
It wrote fast. Really fast.<br class="">
<br class="">
Then it stopped.<br class="">
<br class="">
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 class="">
<br class="">
root@basket1:/root# zpool status -v zoom<br class="">
pool: zoom<br class="">
state: ONLINE<br class="">
status: One or more devices are faulted in response to IO failures.<br class="">
action: Make sure the affected devices are connected, then run 'zpool clear'.<br class="">
see: <a href="http://illumos.org/msg/ZFS-8000-HC" rel="noreferrer" target="_blank" class="">http://illumos.org/msg/ZFS-8000-HC</a><br class="">
scan: none requested<br class="">
config:<br class="">
<br class="">
NAME STATE READ WRITE CKSUM<br class="">
zoom ONLINE 0 0 1<br class="">
mirror-0 ONLINE 0 0 6<br class="">
c4t1d0s1 ONLINE 0 0 6<br class="">
c5t1d0s1 ONLINE 0 0 6<br class="">
<br class="">
errors: List of errors unavailable (insufficient privileges)<br class="">
root@basket1:/root# ls /zoom/<br class="">
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 class="">
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 class="">
root@basket1:/root# touch /zoom/hi<br class="">
<br class="">
So read access appears to be ok. Writes are totally boned, however. That touch just hangs forever.<br class="">
<br class="">
So what do I need to do to provide you all with the information you need to diagnose this.<br class="">
<br class="">
Thanks!<br class="">
<br class="">
-brian<br class="">
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