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Wednesday, October 12, 2011

vCenter 5 install error - FQDN cannot be resolved

To resolve it, you need to and a reverse lookup zone to your domain DNS server. Add the reverse zone if e.g. your vCenter resides on subnet.
go to the vCenter server and run ipconfig /registerdns
Refresh DNS service console and check if the pointer record for the vCenter server actually appeared there.

ESXi 5 nested install

Here is my LAB:

1. GA-970A-D3 MB with built-in Realtek NIC chipset and IOMMU support (no video - I used some old PCI video card), AMD 6 core 3.2 GHz CPU, 16 GB of GSKILL RAM, 400 w SPI power supply (I had some generic ATX case already), no HDDs - booting from some old 1GB USB stick ; bought in Memory Express ( for $426 including taxes. Not so bad.

Description Qty Unit Price Price Qty Unit Price Price
Gigabyte GA-970A-D3 w/ Dual DDR3 1866, 7.1 Audio, Gigabit Lan, PCI-E, CrossFireX 1 $109.00 $109.00 1 $103.74 $103.74
AMD Phenom™ II X6 1090T Black Edition 3.2GHz w/ 9MB Cache 1 $179.99 $179.99 1 $167.12 $167.12
GSKILL Ripjaws X Series 8GB PC3-10666 Dual Channel DDR3 Kit (2 x 4GB) 2 $49.99 $99.98 2 $47.44 $94.88
SPI ATX-400PN 400 Watts ATX12V 2.01 Power Supply w/ 120mm Fan, Noise Killer 1 $39.99 $39.99 1 $39.99 $39.99

Subtotal $428.96
Subtotal $405.73

Taxes $21.45
Taxes $20.29

Total $450.41
Total $426.01

2. Shared NFS storage on a Linux box.

Installation/configuration process
  • Install and configure ESXi 5 as usual.
  • Configure vSwitch (or VM Network Port Group) with Security Policy Exception set to Promiscuous Mode - Accept  (this is very important, otherwise you'll get network issues for your nested VMs - e.g. in particular they would be able to get DHCP address, UDP and some other protocols like SIP etc would work but there won't be any TCP connectivity!)
  • If you want to use VLANs in nested hypervisors, create additional port group, name it e.g Trunk and set VLAN ID to 4095
  • Enable Hardware virtualization on physical ESXi 5 host - add vhv.allow = "TRUE"  to /etc/vmware/config of your physical ESXi 5.0 host using vi or simply run
    echo 'vhv.allow = "TRUE"' >> /etc/vmware/config 
  • Create virtual ESXi 5 on your physical ESXi 5 host, use version 8 hardware and Red Hat 5 64bit OS, make sure the SCSI adapter is LSI Logic Parallel (default), assign 1 NIC from regular VM network ports and several NICs from Trunk port group.
  • Edit settings of the newly created ESXi 5 VM - change OS type in "Options" to Other-> ESXi 5.0
  • Select "Intel EPT/AMD RVI for MMU virtualization" in Options -> CPU/MMU virualization
  • Attach the ESXi 5 iso CD image, power on and install as usual.
  • If you have only 1 shared datastore and use HA cluster you'll receive the following error when you try to start a VM in cluster : "The operation is not allowed in the current state" or something like that. You'll also get the following warning message in the summary tab on the hosts: "The number of heartbeat datastores for host is 1, which is less than required: 2". This is because new advanced HA was introduced in ESXi 5 which relies on datastore heartbeat. Default numbers of hearbeat datastores is 2 (could be changed from 2 to 5). To disable sufficient datastore condition checking go to Cluster HA advanced options, add the following setting: das.ignoreinsufficienthbdatastore  and set the value to be True if you want, on the other hand, to change the number of heartbeat datastores required, add the following setting: das.heartbeatdsperhost and set the value to be anything from 2 (default) to 5

Friday, October 7, 2011

Exchange 2010 installation/configuration tricks

Just to summarize some of the issues I had when installing/configuring Exchange 2010

1. Add your domain to "Accepted Domains"
2. Configure the Receive Connector for incoming emails by enabling Anonymous authentication and specifying the FQDN name for HELO/EHLO
3. Create SMTP Send Connector
4. For blank OWA page issue - go to Server Manager->Features->Add Feature, select to install the “RPC over HTTP Proxy” feature and all dependent features
5. For "Base theme could not be found" OWA issue - run "C:\Program Files\Microsoft\Exchange Server\V14\Bin\UpdateCas.ps1" from Exchange Management Shell
6. For the "You must close all dialog boxes before you can close Exchange Management Console" Management Console error - roll back your IE9 back to IE8.
UPD: Issue has been finally resolved. Here is the link to MS fix: 

Sunday, October 2, 2011

VMware Certification Discounts

VMware Certification Discounts of 25% through 11/30/2011

Codes for 25% off VCP/VCAP/VCA exams through 11/30/2011