Log Insight Cluster: Data Not Balanced Across Nodes

In Log Insight 2.0 a scale-out feature was introduced. The best practice when using scale-out is to configure an external load balancer in front of the cluster and send all ingestion traffic (i.e. syslog and ingestion API) to the load balancer instead of directly to a node. The reason for this best practice is to assist with balancing data across nodes and also to provide ingestion high availability. In this post, I would like to discuss why data may not be balanced across a Log Insight cluster whether a load balancer is used or not.

unbalanced_scale

Continue reading

Cisco MDS CPU utilization of 100 percent seen in certain situations

For those of you who read the MDS 9000 NX-OS update, 5.0(7), release notes, you may have noticed that the title of this post is one of the caveats that was resolved. I figured I would elaborate a bit more on this issue as I was directly involved in discovering it and I am directly involved in ensuring it gets fully resolved.

Continue reading

Rescan All Hangs ESXi

I ran into a interesting problem the other day. I was brought into an environment that had a pair of ESXi 5.1 hosts connected to an iSCSI datastore. One host could see and access the datastore without issue while the other host showed no datastore attached. Per the administrator both hosts had been mounted to the datastore and the claim was that the environment had not be touched/changed in any way.

What was going on and how can you fix it?

Continue reading