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After having troubles almost every week and missing the time frame
to catch the bastard, today I finally had the opportunity to catch
it in action:)<br>
<br>
As it turns out, it looks like a ZFS(not likely) or HW(probably)
problem. When in "hangup" state, iscsi and network worked flawlessly
and I was able to connect to iSCSI(but mounting the FS and issuing
commands(show lvm volume,..) worked really slow). I was also able to
work on the server, so it wasn't locked up.<br>
<br>
Then I decided to check the ZFS FS. I tried to create a file in ZFS
mount directory by issuing 'touch test-file' and command froze. I
tried to kill it with CTRL+C to no success. I tried to kill the
process with kill -9, but that did not help either. Looking at
iostat output, there was some reading happening, but absolutely no
writes (0, nada).<br>
<br>
I used 'lsiutils' to connect to my LSI HBA and issued port reset,
following a hard SAS link reset in a hope it will come back, but it
was still frozen. I also checked 'phy counters' in lsiutils, and
there were some devices with errors, but that could be due to port /
link reset.<br>
<br>
Long story short, after 30min, everything returned to normal,
without an errors message in logs or anywhere else. Bad thing is,
iSCSI target froze a few minutes later and only way to resolve the
trouble was to restart the server:(<br>
<br>
Matej<br>
<br>
<div class="moz-cite-prefix">On 12. 05. 2015 07:13, Matej Zerovnik
wrote:<br>
</div>
<blockquote cite="mid:55518BFF.6080608@zunaj.si" type="cite">
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I know building a single 50 drives RaidZ2 is a bad idea. As I
said, it's a legacy that I can't easily change. I already have a
backup pool with 7x10 drives RaidZ2 to which I hope I will be able
to switch this week. I hope to get some better results and less
crashing...<br>
<br>
What is interesting is that when the 'event' happens, server works
normaly, ZFS is accessable and writable(at least, there is no
errors in log files), only iscsi reports errors and drops the
connection. Another interesting thing is that after the 'event',
all write stops, only read continues for another 30min. After
30min all traffic stops for half an hour. After that, everything
starts to coming back up... Weird?!<br>
<br>
Matej<br>
<br>
<div class="moz-cite-prefix">On 09. 05. 2015 02:49, Richard Elling
wrote:<br>
</div>
<blockquote
cite="mid:40C78E86-F32D-4588-AF98-EB9820019960@richardelling.com"
type="cite">
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<div class="">On May 5, 2015, at 9:48 AM, Matej Zerovnik
<<a moz-do-not-send="true" href="mailto:matej@zunaj.si"
class="">matej@zunaj.si</a>> wrote:</div>
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<div class="">
<div style="font-family: Calibri,sans-serif;
font-size: 11pt;" class="">I will replace the
hardwarw in about 4 months with all SAS drives, but
I would love to have a working setup for the time
being as well;)<br class="">
<br class="">
I looked at smart stats and there doesnt seem to be
any errors. Also, no hard/soft/transfer error
reported by any drive. Will take a look at service
time tomorrow, maybe put the drives to graphite and
look at them over a longer period.<br class="">
<br class="">
I looked at iostat -x status today and stats for
pool itself reported 100% busy most of the time,
98-100% wait, 500-1300 transactions in queue, around
500 active,... First line, that is average from
boot, says avg service <a moz-do-not-send="true"
href="http://time.is" class="">time.is</a> around
1600ms which seems like aaaalot. Can it be due to
really big queue?<br class="">
<br class="">
Would it help to create 5 10drives raidz pools
instead of one with 50 drives?<br class="">
</div>
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<div><br class="">
</div>
<div>It is a bad idea to build a single raidz set with 50
drives. Very bad. Hence the zpool</div>
<div>man page says, "The recommended number is between 3 and 9
to help increase performance."</div>
<div>But this recommendation applies to reliability, too.</div>
<div> -- richard</div>
</div>
<br class="">
</blockquote>
<br>
<br>
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