What is MPIO?
In my current role I have inherited a largish vSphere 4.1 environment, that has to put it nicely “evolved”. We have been having host disconnection issues in one of the clusters, coupled with HA Configuration errors. well today one host disconnected and absolutely refused to reconnect, bizarrely it kept telling us that the username/password combination was incorrect within vCenter.
So we jumped on the ILo and entered the SAME username and combination and low and behold we gained access to the promised land. Now I know what you are thinking “CapLocks”, but no checked that.
My next troubleshooting step was to restart the management agents on the errant host but again this did not fix the error.
The I had a “lightbulb” moment, as we checked the network settings on the host. I saw that the gateway address was incorrect, it was configured with a correct gateway address but for the wrong subnet. it was set to the vMotion network not the Management network. reset that and all of a sudden we could rejoin vCenter.
I then checked the rest of the Hosts in the Cluster and found the same basic configuration error, we reset the gateway across the cluster and low and behold now HA works as designed and no more configuration errors.
Moral of this story is “Check the Basics”
VMware Tools for Linux is getting better all the time. Actually it has been in movement for years and the way it has improved shows the strength of Open Source.
Back in the old days, we only had one package to care about: VMware Tools as bundled with the VMware product. Many times it stopped working after a kernel upgrade and we had to patch the source code by hand. Continue reading
Updated Security Advisory, this one relates to some third party advisories. but please note that it does include a critical status!!, however that said, there is currently nothing you can do about the issue unless you are running vCenter 5.5, the update to the latest version “Update 1”.
The issue relates to a possible DDoS attack on the NTP Service and I advise you to read KB2070193 for full information on the vulnerability and remediation approaches.
Today marks the release of vSphere 5.5 Update 1, you can find the release notes here and the links to the download are found here. Why is this such a milestone? Well it also finally marks the release of VMware’s long awaited entry into the world of Software defined storage the VSAN, but before we move onto that what else is contained in Update 1? Continue reading
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Not so common problems
There is a subset of problems that happen very very rarely. That require a set of coincidences to occur in order for them to happen. The chances of these events actually happening are so small as to be negligible. In modern computing, they happen. Continue reading
Today finally marks the announcement of the general availability of VMware VSAN. This is VMware’s most public beta to date.
So, What Is VSAN?
VSAN is true integrated software-defined storage. It is embedded into the vKernel, it is a distributed object store, and as such, it is resource efficient. There is no requirement for an extra virtual machine on each host.
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SDN is getting a lot of hype at the moment. Coupled with its kissing cousin, network virtualization, it is all the buzz. So what exactly is it? At its most basic level, SDN is an approach to networking in which the control plane is decoupled from hardware and given over to a software controller.
To read the full post click here