Archive for the ‘Tips’ Category

Purple screen for ESX host during vSphere 5 Upgrade

Posted on October 27th, 2011 in ESXi, Tips, vCenter, Virtualization | No Comments »

Just read through 1 of the KB here which referring to the potential risk to create a purple screen scenerio during the vSphere 5 upgrade while you ESX host update 2 could potential conflict with the vCenter 5.

You may encounter an issue where:

  • You have recently upgraded your vCenter Server to version 5.0
  • You have hosts of minimum version ESXi 4.0 Update 2 (build 261974) and maximum version ESXi 4.0 Patch 9 (build 360236) in your vCenter Server inventory
  • After the vpxa agents are upgraded, the ESXi 4.0 Update 2 hosts experience a purple screen that includes this error:NOT_IMPLEMENTED bora/vmkernel/filesystems/visorfs/visorfsObj.c:3391
Solution
This issue has been resolved in ESXi 4.0 Update 3. To avoid this issue, upgrade all affected hosts to at least ESXi 4.0 Update 3 (build 398348) before upgrading vCenter Server to 5.0.
please refer to the full post here for more details.

VCP 5 Exam Experience

Posted on October 16th, 2011 in Tips, Training, Virtualization, vSphere | 19 Comments »

I just did my VCP 5 Exam las 2 days ago. I would like to share some of my experience to you, who may plan to go for the exam. Currently, VMware will allow all VCP 4 to proceed to direct exam upgrade path for VCP 5. You need to get your VCP 5 before end of Feb 2012. If you are failed to obtained the VCP 5 after end of Feb 2012, you will require to attend the official training before you can sit for the exam.

Well, I would like to share some of my thought and experience for the VCP 5 exam. I had passed it but it took me more than 1.5 hours as I recheck all the 80 questions after I answered the 1st round. I used to be the 1st VCP 5 in Malaysia, but I am not sure whether I am going to be 1st VCP 5 again in Malaysia. The exam is never easy as most of the questions are deep dive into specified technology area, and you will require a lot of hands on deployment, support administration or lab environment to visualize or provide the correct answer. Simon Long’s blog may had helped little bit, but to my surprise, most questions are relevant to the administration experience on VMware stuffs.

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Database requirement in Citrix Xendesktop

Posted on October 13th, 2011 in Tips, Virtual Desktop Infrastructure, Xen, Xen Desktop | No Comments »

I had gone through few days of hands on training for Citrix Xendesktop. The experience of the training is good and it went through technical deep dive. 1 of the key thing we discussed during the training was about the databases requirements to support the Xendesktop and Xenapp infrastructure. Microsoft SQL will be 1 of the key component, and you will require to plan for the high availability architecture to support the production environment.

The best approach may just consider to build an independent Active/Passive or Active/Active SQL cluster to support the infrastructure. A backup for the SQL is always recommended to create recovery point in the event of data corruption. Most data on the SQL databases is the configuration changes, log and etc. Similar to VMWare vCenter Database.

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XenDesktop License Server Flexibility

Posted on October 11th, 2011 in Announcement, Tips, Virtual Desktop Infrastructure, Virtualization, Xen, Xen Desktop | No Comments »

While I am attending the training for XenDesktop today, we had covered the topic of License Server for Xendesktop.
I had raised the question to the trainer.

what if the license server go down, will all the existing connections or sessions been terminated automatically?

He had explained as the configuration in the license server and license files are design to prevent the point of failure in the scenario of license server unavailable due to any failures. You will be given 28 days period of time with unlimited seats in the event of license servers unavailable during the outage.

In normal scenario, assume your license server is functioning with 1000 seats, you will also allow to provision 10% extra within 28 days before you increase the purchased licenses. This will allow you to turn on extra capacity temporally in the short period.
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Is Public cloud ready for enterprise application such as Office Applications?

Posted on September 29th, 2011 in Data Center, Tips | No Comments »

Microsoft had pushed very hard for the office 365 to all their existing client doesn’t matter they are SMB or Enterprise. Personal opinion, I had tried out the office 365, the experience is useable but it doesn’t meet the requirement of my expectation for office use. Anway, this is just 1 of the down side. When you look at the infrastructure readiness and dependancy, I think enterprise may putting too much risk as now to adopt to office 365.

If the office 365 are able to be dedicated connectivity and resources with robust infrastructure behind, it could make a lot of different for many users to be considered.

Recently there are many outage happen on the cloud provider, which alert many of the users start to re-think to the strategy of cloud to minimize the business impact in the event of unexpected outage. A right strategy for Cloud can bring benefits to the company, but a wrong strategy of cloud could end up create disaster to the environment too. Those major outage top news had forced the service provider to further enhance the infrastructure uptime.

This report explain the uptime been claimed by Google and Microsoft both.

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