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VMware

VMworld, the aftermath

Duncan Epping · Mar 1, 2008 ·

It’s been a weird couple of days. I arrived in Cannes with the flu. Especially Monday, but also Tuesday, I wasn’t in top condition to say the least. Same goes for my cellphone which for some reason decided to quit on me, apologies to the people that tried to reach me and got my voice mail instead. Besides these physical and technical problems VMworld was awesome! I’ve met a lot of cool people and attended a lot of cool sessions, especially the vendor sessions were great, EMC / Brocade / Netapp. Although I must say that it would be nice if VMware adds a few real in depth sessions which will leave your brain dazzled for days, for instance on VMotion/DRS/Networking/Storage.

What surprised me most were the products Stage Manager, Lifecycle Manager and Lab Manager. They all seem the same to me. There’s a slight difference here and there but the global idea is the same. Provision VM’s with the possibility to archive them, assign them to a team or people etc. I can imagine these products will merge into one product or at least Lab Manager and Stage Manager will. Lifecycle Manager should be turned into a plugin for VirtualCenter. I don’t have any hard evidence for this or even a remote clue… but this is what I would expect to happen over the next couple of months.

One of the most promising new products that I played with definitely is Site Recovery Manager. This will save a lot of time and money for the companies that now have to do a manual fail over when a disaster occurs. One of the things that Site Recovery Manager still lacks though is the “Fail Back” button, which definitely is a feature that should be included soon. If I can fail over automatically it would be very nice if I could fail back automatically, the test button is great but everyone should really test the fail over every once in a while and with out a fail back this will be very hard.
The two new announced “products” VMsafe and vServices both leave the competition light years behind again. Both products were in the line of expectations. VMsafe was already more or less announced when VMware introduced VMCI 6 months ago:

The Virtual Machine Communication Interface (VMCI) is an infrastructure that provides fast and efficient communication between a virtual machine and the host operating system and between two or more virtual machines on the same host. The VMCI SDK facilitates development of applications that use the VMCI infrastructure.

vServices is the next step for VirtualAppliances. This gives the system engineer a new view on his system, looking at the VM from a service perspective instead of a server perspective makes sense to me, especially when you consider most services span multiple VM’s/servers these days.

Also VDI/VDM is definitely a technology VMware heavily bets on. Especially the new “offline usage” feature and the “patch one patch many” feature is something that will attract all engineers. This will not only save a lot of time updating but also solves most Corporate Laptop problems we are currently facing. The Linked Clone option sounds awesome, but what will happen when a 1000 VDI Desktops running linked clones are accessing the SAN at the same time and expanding the linked clone file at the same time. (The 09:00 clock bubble) I can only imagine this would put an outrages amount of stress on the SAN, but only time will tell I guess.

So that’s it for now, I’m gonna spend some time with my family and will be blogging full speed again the upcoming days, and testing those 16.000 users on my Exchange server of course. Maybe one of you can hook me up with suitable test servers and SAN… ๐Ÿ˜‰

HA advanced options

Duncan Epping · Feb 21, 2008 ·

PeterB posted a topic about all known HA advanced options on the Dutch VMUG. If anyone has more options please post ’em and let’s try to make this list as long as possible:

  • das.failuredetectiontime – Amount of milliseconds, timeout time for isolation response action
  • das.isolationaddress[0-9] – IP address the ESX hosts uses validating if it is isolated from the network or not. It will use the default gateway by default. With this setting additional addresses can be configured for use.
  • das.poweroffonisolation – Values are False or True, this is for setting the isolation response. Default a VM will be powered off.
  • das.vmMemoryMinMB – Higher values will reserve more space for failovers.
  • das.vmCpuMinMHz – Higher values will reserve more space for failovers.
  • das.defaultfailoverhost – Value is a hostname, this host will be the primary failover host.

VMworld time table

Duncan Epping · Feb 20, 2008 ·

For those attending the VMworld, check out the time table Rene created in Excel. Will come in handy when deciding which session to attend!

I am attending VMworld Europe 2008 Next week in Cannes. Today I was looking what kind of sessions wil be presented. On the VMworld site there is a link to see a long list of available sessions, but I found this list hard to use. I made a nice timetable in Excel to see which session is on what time in which room.

VMworld-EUROPE-2008-Timetable

VMworld Technical Sessions time table

Duncan Epping · Feb 15, 2008 ·

For those attending the VMworld, the time table for the technical sessions is online! Check it out! I’m having a hard time picking which deep-dive sessions I will attend, there are so many to choose from!

Storage VMotion Fails With Error Message “Failed to unstun VM after disk reparent”

Duncan Epping · Feb 13, 2008 ·

VMware justed added a new KB article about problems with Storage VMotion script:

Storage VMotion can fail for a virtual machine with the error message:

Failed to unstun VM after disk reparent.

The virtual machine is partially migrated and powered off. Generally, the virtual machine cannot be powered on again.

This issue affects:

  • Virtual machines converted in-place (not deployed or cloned) from template virtual machines with compact disks.
  • Virtual machines cloned from a virtual machine of the above type (as well as virtual machines cloned from those virtual machines, and so on).
  • Virtual machines with disks created with the following command: vmkfstools -i <source> -d <destination>. ESX Server 3.5 does not support thin-provisioned (or sparse) disks.
  • Virtual machines created through the SDK with at least one disk created using the RelocateSpec.transform parameter set to sparse. Again, ESX Server 3.5 does not support thin-provisioned disks.

This issue affects the above types of virtual machines because when a disk that is thin-provisioned, or is flat but was cloned from a virtual machine that thin-provisioned disks, is copied to the target datastore as part of Storage VMotion, the disk’s content ID (CID) value is not preserved (although the content of the disk is correctly copied). When the virtual machine attempts to open the disk, it notices the CID is different from what it expects and fails to resume because it believes the disk is corrupted. In reality, the disk is not corrupted, only the CID is incorrect. So not only does the virtual machine end up powered off, but it cannot be powered back on because the CID is still incorrect.

To identify and solve the problem download the scripts attached to the article!

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About the Author

Duncan Epping is a Chief Technologist and Distinguished Engineering Architect at Broadcom. Besides writing on Yellow-Bricks, Duncan is the co-author of the vSAN Deep Dive and the vSphere Clustering Deep Dive book series. Duncan is also the host of the Unexplored Territory Podcast.

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