Archive for the ‘Xen’ Category

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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Citrix XenServer 5: Optimized Performance for XenApp Compared to VMware ESX 3.5u3

Posted on May 12th, 2009 in Industry News, Tips, Xen | No Comments »

Just got another report posted by Tolly Group:
Citrix XenServer 5: Optimized Performance for XenApp Compared to VMware ESX 3.5u3

Tolly Citrix Systems commissioned Tolly to evaluate the performance of Citrix XenApp when running on Citrix XenServer 5 and compare that with XenApp running on VMware ESX 3.5u3.

Testing focused on system scalability and user quality-of-experience. This test report was approved for publication by VMware. The VMware End User License Agreement (EULA) requires such approval.

The testing was conducted in accordance with Tolly Common RFP #1101, Virtual Server Performance. That document is available for license and you can find more information about it on the Tolly Common RFP website.

Download the free Citrix/VMware report as below:
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VMware and competitor

Posted on April 23rd, 2009 in Hyper-V, vSphere, Xen | 1 Comment »

I was just came back from Sime Darby Convention Centre – HP ProLiant G6 Servers Launch event and VMware competitor “Citrix” and “Microsoft” representative talked about Microsoft Hyper-V and Citrix Xen hypervisor. Anything interesting? Seriously, both of them talked about marketing bull shit! If I’m have not try VMware, Hyper-V or Xen before, probably I may interested with the presentation.

If you’re looking at technical point of view, personally I think VMware competitor is few year behind VMware vSphere. Check out more detail about VMware vSphere 4 Cheat Sheet posted by Jason Boche.

Referring to costing, I don’t agreed with what Citrix presented during the event this morning. You’re always try to tell customer pay if you need it. What are you talking about? Are you trying to tell Enterprise customers don’t use HA or don’t use those features provided? How about Microsoft Hyper-V cost comparison?
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My Personal Experience about Citrix XenServer 5.0

Posted on October 8th, 2008 in Virtualization, Xen | 25 Comments »

Yesterday Craig mentioned about 8 VCPU per VM on Citrix XenServer 5 is really a good stuff from Citrix and I must admit that.

I did a quick test and I would like to share my personal review about Citrix XenServer 5.0:

Personally I think network speed is fast compare to VMware ESX. I have a physical 1Gbps NIC network speed and I can get 2Gbps network speed after install XenTools on Windows 2008 server but require 2 times reboot(SuSE Linux require 1 reboot). Anyway VM guest shutdown and reboot process is faster than VMware ESX.

Citrix XenServer

I was try to install SuSE Linux 10 using 4 ISO CD (both NFS or CIFS), the Citrix XenServer always give me an error “The VM rejected the attempt to detach the device xxxxx refusing to close” when switch ISO CD1 to ISO CD2. You have to extract 4 ISO CD into one single location to make it work or copy ISO to local storage(provider you have enough local disk space).

Citrix XenServer

The enterprise product should not have similar issue and this is not make sense at all.

Citrix XenServer

Anyway, you can try alternative way using “Install URL” instead of using ISO Image once you have extract ISO CD into single folder on your web server.

Install URL: http://xx.xx.xx.xx/inst/10/32/SP2/ALL
Advanced Boot OS Parameters:
console=ttyS0 xencons=ttyS hostip=xx.xx.xx.xx/24 gateway=xx.xx.xx.xx dnsserver=xx.xx.xx.xx

Please make sure your have correct IP, gateway and DNS setup properly else you will getting error during installation.

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