Archive for the ‘Tips’ Category

VMware DRS disable caused by single VM

Posted on June 8th, 2011 in Tips, Virtualization | No Comments »

My Client had a weird issue recently on 1 of the production vSphere 4.1 host. Error message shown on summary tab as ” DRS is not able to function normally cause by insufficient resource”.This is not the exact message as I can’t remember the full error message, but it represent the similar meaning of the error. This message had been alerted for more than a week as we thought the mgmt-ware restart command should able to fix this.  The system is currently in production, therefore we are suggesting to vmotion out all the production VMs, and put the host to maintenance before we issue the command.

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VMware vSphere 4.1 Update 1 on SQL 2008 R2

Posted on June 8th, 2011 in Tips, vCenter, vSphere | No Comments »

Microsoft SQL 2008 R2 had been officially supported for VMware vSphere 4.1 update 1. Previously it doesn’t supported if you are not on update 1. I just did an upgrade yesterday and here is some finding to share. 1st, I tried to perform an upgrade as usual, and of course I retain all the database information to prevent reconfiguration and performance data lost for the previous environment. Unfortunately, the update manager portion had given error which it not allowed us to continue the installation. It left me no choice that a re installation will be required. If you hit to the same situation, do not panic as your previous configuration will still retain, and no down time require even you are on dVswitch. Ensure no host name changes in this case will be safe enough for you to proceed further.

During the re-installation, you I will suggest you follow the sequence to un-install all the vCenter application 1 by 1. Update Manager required to be un-install before you uninstall the vCenter server. You can backup and re-attach the SQL DB as the MDF and LDF files is in place. If your vCenter is on virtual environment, strongly recommend a snapshot taken before any changes been made. Once you re-attach the DB, you will require to perform the DSN connections to be created from ODBC.

Here is the tricky part you need to take note. It take me 2 hours to figure out due to some confuse and mistake. vCenter Server will able to run on 64 bits DSN as standard, you will not face any issue on that. When come to update manager, DO NOT try to access the ODBCAD32.exe from start run directly on windows. It will point you to the 64 bits ODBC configuration tab. You will require to browse to the path directly as :

%systemdrive%\Windows\SysWoW64\Odbcad32.exe

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NIC teaming policy for Servers

Posted on May 27th, 2011 in Server, Tips | No Comments »

NIC teaming is common practice in Data center to avoid link drop due to hardware failure on NIC or Switches. While choosing the teaming policies or architecture consideration, Network Architecture and configuration is the most important thing for you to look at. I will suggest all of us to consider the layer 2 and Layer 3 configuration before jump in to the server teaming policy as different configuration on the network side could caused an outage to the network as well as the servers which both are always relate together.

Beside that, strongly urge all the users to look in to the application tier as well, which there are some applications may not support ip-hashing which could end up confuse the switches and create looping. Most Servers require NIC teaming just for HA but not aggregation through put, if that the case, choose wisely what you need rather than what is good to have to prevent unnecessary down time to the infrastructure.

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Domain Controller Migration from P2V or V2V

Posted on May 27th, 2011 in Server, Tips, Virtualization, vSphere | 2 Comments »

I had some discussion internally with my buddy today about this topic mainly due to some challenges been faced by the client as their current active DNS and Domain controller is hung once a while due to unknown issue. The  current domain controller are hosted on the Windows server 2005 which was not the matured product that came to market more than 5 years ago. They do have a new VMware vSphere 4 Infrastructure in place now.

The question posted by my buddy was;  how we could move or migrate the same state of the virtual machine to a physical or virtual without impact to the production environment?  My answer to him was big NO as this is Domain controller and not a normal application or database server migration.

We went through some due diligence and found that certain machines had been pointing to this DC for the DNS server preference IP. In this case, we may need to ensure Preferred DNS server IP on the client are require to change.

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Major Changes on Nexus 1000V Version 1.3 to 1.4

Posted on April 9th, 2011 in Announcement, Tips, Virtualization, vSphere | No Comments »

Recently we had done a major upgrade for our client from Nexus 1000V version 1.3 to 1.4. There was an interesting comment from the upgrade utility check which warn us prior to the upgrade we performed.

===========

CHECK 8:

===========

Checking for channel group command on interfaces…

###############################################################################

##                           NOTIFICATION                                    ##

##                                                                           ##

## List of Interface(s) detected with channel-group <id> command(s) applied: ##

1 : Ethernet3/2

2 : Ethernet3/4

3 : Ethernet3/6

4 : Ethernet3/8

5 : Ethernet4/2

6 : Ethernet4/4

7 : Ethernet4/6

8 : Ethernet4/8

9 : Ethernet5/2

10 : Ethernet5/4

11 : Ethernet5/6

12 : Ethernet5/8

##                                                                           ##

## Note: ‘channel-group <id>’ command will be deprecated from 4.2(1)SV1(4)   ##

## release . Kindly migrate the above listed ports as per steps mentioned    ##

## in Cisco Nexus 1000v Interface Configuration Guide, Release 4.2(1)SV1(4). ##

###############################################################################

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