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How to enable/start perpetual logs?
Hello,
I need to start perpetual logs on a cluster as the existing logs are very old, 1 year ago. So how can start the collection of new perpetual logs and for how long to have good overview on the cluster performance?
echolaughmk
522 Posts
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October 31st, 2016 05:00
Hi,
They should be always running, but there are some prior issues I think that might stop them on an upgrade or restart. One workaround can be found here (depending on what code you are on):
The default performance monitors may pause after a GeoSynchrony upgrade or when the VPLEXManagementServer console restarts.
To restart the perpetual monitoring, run the following command :
VPlexcli:/>ll /monitoring/directors/*/monitors/
This should be run on both mgmt stations if you have a metro and see the issues.
After a little while you should see the log files with "perpetual" in their name or you can run a collect-diagnostics and see if that grabbed them as well.
garyo
89 Posts
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January 25th, 2017 10:00
The following CLI command generally speaking is the best first option to try:
VPlexcli:/> debug engineering-mode on
VPlexcli:/> emc-internal configuration restart-perpetual-monitors
VPlexcli:/> debug engineering-mode off
5.4 SP1 specific, this KB mentions the "ll /monitoring/directors/*/monitors/" command, but there is some more to it and is only 5.4 specific: https://support.emc.com/kb/334191
As for how long you need to get a good view of performance - well, that all depends but generally speaking I'd say at least 24 to 48 hours is required to get a good feel for performance. Perpetual monitor files contain about 60 days or so worth of history.
Instantaneous performance over the last 5 minutes is visible via the Unisphere GUI.
Be sure to also check out the VPM (VPLEX Performance Monitor) for virtual-volumes which can store I believe up to 30 days of per virtual-volume information.
Gary