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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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:
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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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This post is to shared 1 of the incident happened to the previous deployment. There were 2 types of Network adapters running on the physical host, which are NetXen and Broadcom in this case. For the Broadcom adapter, it come with TOE, therefore we had configured the VMkernal on the adapters to handle the IP base datastore for the ESX host.
There was a case that the ESX host become isolated and unresponsive due to the Netxen Driver failure, which we will still able to type command from the server console. While this happen, as the isolation respond option was set to leave power on, the VMware HA will not kick in to force the virtual machine for the fail over process.
There are pros and cons while doing these, but according to my Local VMware friend, the system recognize the lock session on the specified virtual machines were detected in the datastore, therefore the HA clustering will not allow the surviving systems to take over the session. The explanation fall exactly the same with our incident as the VMkernel traffic was still alive during the host network outage happen on the Netxen NICs.
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There is known issues been faced by small group of user who had deployed their VMware ESX host on the latest platform with G7. You can refer to the official link from HP here and additional KB from VMWare referring to the same issues. If you are facing this, you may be the unlucky 1, but nothing much you could do as the PSOD message will refer to the CPU error, compatible issues and etc.
The only thing you could do is to wait until both HP and VMware to come out a final fix in this case. Quick solution, is change hardware vendor or different platform. I had experienced 3 times about it, in the past 2 months and this is the latest finding we had received from both VMware and HP regards the latest PSOD we had. HP had recommended to upgrade the BIOS, Firmware and driver for multiple times, but this doesn’t fix the issue we are facing. Lately there had release another new update bios and hope this problem will be gone after this.
Feel free to share any work around solution beside the official link provided by tech support.
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While cloud computing adoption had been grown over time, how often does the users were remembered about the security consideration? This a good question should be check with every cloud users. Even with Public cloud provider, you will require to fully responsible to maintain the security of the services or servers from the provider. Cloud often referring to resources sharing and infrastructure sharing. Security requires to be further enhanced to reduce the operation risk for the cloud users.
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