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VMware HA

Posted on 2012-04-12
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Last Modified: 2012-04-12
When scanning our hosts for vulnerabilities, I found that TCP port 8045 on the ESXi host showed up as running IBM DB2, I do not think this is the case, but I am not sure what all happens with HA.  Can anyone shed some insight on this?
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Question by:asrvwiz
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 37838220
8042 to 8045 TCP is used by VMware HA, not IBM DB2.

See TCP/UDP ports in use
http://kb.vmware.com/kb/1012382

VMware HA, is VMware's High Availability feature, which restarts virtual machines automatically when a host fails in a VMware Cluster.

VMware High Availability - Decrease Downtime and Reduce Risk
http://www.vmware.com/products/high-availability/overview.html

VMware High Availability (HA) Product Briefs
http://www.vmware.com/pdf/ha_datasheet.pdf
http://www.vmware.com/files/pdf/VMware-High-Availability-DS-EN.pdf

VMware vSphere Availability Guide ESX 4.1vSphere
http://www.vmware.com/pdf/vsphere4/r41/vsp_41_availability.pdf
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by:asrvwiz
ID: 37838662
Distributed Resource Scheduler (DRS)). Automate the optimal placement of virtual machines restarted after server failure.

Can I choose what host a guest goes to?
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 37838685
You can define Affinity rules, to stick VMs to hosts, but that's not really the idea behind DRS, because it best selects the host.

VMware vSphere Availability Guide ESX 4.1vSphere
http://www.vmware.com/pdf/vsphere4/r41/vsp_41_availability.pdf
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by:asrvwiz
ID: 37838724
What does triggers an HA event?  Just the lost of network connsctivity between vCenter and the host, or would a power supply failure on a host with dual supplies cause an HA event?
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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 37838754
Host failure, which could be hardware fault on the host, or loss of networking to the Host.

A single power supply failure, with two power supplies, does not cause the host to fail!
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