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Category: Hypervisor

vMotion fails to migrate VMs between ESXi host which have the same configuration

vMotion fails to migrate VMs between ESXi host which have the same configuration

As a rule vMotion requires the same family of CPU among involved servers which ensure the same feature set to be presented in order to succeed. This is obvious statement, if you have for example Intel Xeon V3 and v4 CPU generations in your cluster you need EVC in order to make it work. But recently I have came across and issue that vMotion were failing to migrate VMs between hosts with identical configuration. That were Dells R730 with V3…

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vCenter Appliance 6.0 U3 email notifications are not sent when multiple email addresses are defined in an alarm action

vCenter Appliance 6.0 U3 email notifications are not sent when multiple email addresses are defined in an alarm action

Recently I tried to configure email notifications on my lab vCenter Server Appliance (6.0u3), but  experience issue:  “Diagnostic-Code: SMTP;550 5.7.60 SMTP; Client does not have permissions to send as this sender” I tried to use solution from kb: https://kb.vmware.com/kb/2075153 but apparently, the solution does not work with latest 6.0.x appliance! After some research and digging deeper (header analysis ), it seems that root cause was invalid return path in the email header. To resolve this you need to edit two…

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Esxi Net.ReversePathFwdCheckPromisc Advanced setting

Esxi Net.ReversePathFwdCheckPromisc Advanced setting

During deployment of Cisco proxy appliance, we discovered a problem. According to cisco to resolve this problem “Net.ReversePathFwdCheckPromisc” should be set to “1” on ESX’s. The question is – do you know any negative effects which such change could cause. We believe that there must be a reason why by default this option is set to 0 ? That’s why I decided to figure our what it is used for. After some research I was able to find answer: Setting…

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ESXi and Likewise – troubleshooting guide – part 2

ESXi and Likewise – troubleshooting guide – part 2

In last part of this small series, we discussed theoretical background about components and technology related for adding ESX host to windows AD environment. Now it is time to describe troubleshooting options and some real life problems with solutions. Let’s start from dividing all ESXi/Likewise issues into categories: Domain Join Failures Here are most often reasons that an attempt to join a domain fails: The user name or password of the account used to join the domain is incorrect. The…

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ESXi and Likewise – troubleshooting guide – part 1

ESXi and Likewise – troubleshooting guide – part 1

Last week I had to troubleshoot strange issue related to Active Directory integration with ESXI (6.0 version), this was motivation to prepare small (two articles) series about ESXi / Likewise integration and troubleshooting based on my latest experience. VMware use Powerbroker Identity Services (Formerly known as Likewise) for adding ESX host to windows AD environment. To begin as usual is good to have some theoretical background about related components and technology and we describe it all in this part. Below…

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VMware vSphere tags limit – is it known ?

VMware vSphere tags limit – is it known ?

Recently I received quite interesting question – what is the supported maximum quantity  for tags in vCenter 6.0U2 ? Malignant author of the question is a good friend of mine and VMware administrator in one person. He ssked about tags limit because he want to use them to provide more information about each of its production VM’s – roughly speaking need to create about 20000 tags. I thought ok., give me couple seconds to verify this,  and looked fast in…

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vSphere 6.5 – Update Manager changes

vSphere 6.5 – Update Manager changes

Going through our list of articles about new features in vSphere 6.5 the last one is vSphere Update Manager for vCenter Server Appliance. Since vSphere 6.5 it’s fully embedded and integrated with vCenter Server Appliance with no Windows dependencies. It means that vCenter Server Appliance delivers now Update Manager as an optional service similar to Auto Deploy, etc. Since vSphere 6.5 there is no longer possible to connect Update Manager instance that is installed on a Windows Server machine with vCenter Appliance….

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VMware Postgres 9.3.9.0 Installer failed with error code ‘3010’

VMware Postgres 9.3.9.0 Installer failed with error code ‘3010’

Couple days ago I hit strange issue with vcenter 6.x appliance update process. Attempting to upgrade vCenter server 6.0 U1 to 6U2, encounter following error: Installation of component VMware Postgres 9.3.9.0 Installer failed with error code ‘3010’. The installation rolled back after clicking at OK button. I was able to find following KB 2144389 with a similar issue but the workaround didn’t work. After rolling back to a snapshot before the update, we also tried to update vCenter to 6U…

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