wtbt Super Contributor.
Super Contributor.
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High Java util

Hello again!

Running ZCM 2017 Update 1 now on 3 primaries, the third added yesterday for mobile management use. For some time, cannot say how long, the first primary often shows high Java utilization. The second primary usually keeps calm. We've noticed that sometimes when creating bundles they "get stuck" halfways. They seem ok and ready for use but clients get cached item error all the time until something like zman srf or a complete restart is performed on the affected server. We also note that huge log files are created in /var/opt/novell/log/zenworka/ZENLoader with names like java_pid3798.hprof (I've not tried to see what's in them)
On this particular server, when starting gui desktop (which we rarely do), the screen gets filled with notifications from packagekitd, seemingly trying to install an update over and over again, not showing wich one.

My question is, perhaps the easiest fix is to drop this server and set up a new one in the appliance version? If so, will this new server "look like" the old one in all respects? All content synced from the other primary etc? Or is there something I should check out that may be the cause of the behaviour? Note that the server works essentially as it should, most of the times no-one notices anything strange about it.

Regards
Bengt
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Micro Focus Expert
Micro Focus Expert

Re: High Java util

I'm guessing your Linux Server needs OS patching..........
https://www.novell.com/support/kb/doc.php?id=7021007

There was recently a Kernel Update that was out for a few weeks that causes Java to Crash....(Loader and Server use Java)
Check your Kernel Versions and Update if appropriate...........
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wtbt Super Contributor.
Super Contributor.

Re: High Java util

Both primaries on SLES 11sp4 have been regularly patched, running kernel 3.0.101-107-default for some time.
What happens is this: Bundle created in ZCC on primary 1 - bundle not working throwing cached item error or similar. Restarting zenworks services with novell-zenworks.configure (takes long time to fully reinitialise) then diong zman srf followed by zac cc and zac ref on primary 1 usually makes the bundle work. After restarting services java utilization goes through the roof and stays there for some time and then goes low again. Somewhere during this procedure a 4 GiB + file is created in /var/opt/novell/log/zenworks/ZENLoader.
Client error msg looks slightly different depending on whether it tries to download the bundle from primary 1 or 2, niether works.
Bundle created in ZCC on primary 2 works right away as long as the client downloads it from primary 2. Primary 2 has overall low utilization with short peaks from time to time.
Sometimes primary 1 works as it should making new bundles work shortly after creation.
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Micro Focus Expert
Micro Focus Expert

Re: High Java util

I would recommend an SR then.
The only known cause or Java crashes were fixed by the Kernel Fix above released end of last month.
If they servers are Virtualized and the memory is not dedicated, it cause crashes as well so verifying that is also recommended.
However, if after double checking your kernel and memory dedication settings are good....I would recommend an SR as this is not a known or reported issue.
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wtbt Super Contributor.
Super Contributor.

Re: High Java util

We're on Academic so no SRs, unfortunately. Would it be risky to replace the two non-appliance primaries one at a time? Admittedly I haven't done proper research on the subject but is there a path for replacing a non-appliance 2017 upd1 with an appliance (Update 1 not included?) preserving the content? As things are now we have 3 primaries running.

/Bengt
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