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From "Davis, Daniel (NIH/NLM) [C]" <>
Subject RE: Couple of question about Virtualization and Load Balancer
Date Thu, 21 Jan 2016 15:31:47 GMT
> The first one is about virtualization, I'd like to know if there are any official test
> on loss of performance in virtualization environment. I think that the loss of
> performance is negligible, and quick question on test infrastructure is confirming
> this, but I'd like to know if there is some official numbers on this.

I think any "official" test would run into the very reasonable problem of which schema, indexed
data, and queries to test.
This problem is well summarized by

However, there is a Solr performance test tool with a track record - SolrMeter<>.
   You can also do a lot with good old JMeter.

From: [] On
Behalf Of Gian Maria Ricci - aka Alkampfer
Sent: Thursday, January 21, 2016 6:38 AM
Subject: Couple of question about Virtualization and Load Balancer


I've a couple of quick question about production setup.

The second question is about Load Balancer: any clue on how to automatically change the configuration
on the load balancer if some of the node goes down? I'm looking to advices on what to monitor,
the simplest solution could be issuing some test query and verify if the node is able to answer,
but it would be nice to know if there are some standard metrics to monitor to proactively
alert. (Es. Heap size almost full, so it would be probably better to remove the node from
the balancer and alert a human to have a look at the status of the node).

Many thanks.

Gian Maria Ricci
Cell: +39 320 0136949
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