Virtualization Pro

Nov 17 2008   5:19PM GMT

VMware Converter failures due to block size

Rick Vanover Rick Vanover Profile: Rick Vanover

Recently during a P2V conversion, I had an issue where the conversion failed for reasons I could not explain. In looking at the logs of VMware Converter, there was no clear indication of the specific issue. Some of the relevant log entries are shown below:

[#2] [2008-11-08 08:16:32.953 'App' 1592 error] [managedVMCreator,1033] CreateVm task failed: Insufficient disk space on datastore ''.

[#2] [2008-11-08 08:16:33.171 'App' 1536 error] [imageProcessingTaskImpl,552] VmiImportTask::task{4}: Image processing task has failed with MethodFault::Exception: vim.fault.NoDiskSpace

After some deeper research, it turns out that this particular datastore was created with the default 1 MB block size, making VMDK files limited to 256 GB. Fellow blogger Eric Siebert has an excellent post on this site about the formatting options of the VMFS volume as it is brought into VI3. When you add a LUN, you select the block size during the format shown in the figure below:

Selecting a block size

While running VMware Converter on very large volumes is rare, this was one that made me stop and think for while. There are plenty of strategies for very large storage for a P2V conversion, but this was one where the other LUNs were configured with the 1 GB block size and that was fine thus far.

Luckily, there was space that I could evacuate all other virtual machines on that LUN so that I could remove the LUN and format it with a larger block size to get the VMDK file size I needed. The tricky part of this situation is that with VMware Converter experiencing the error on the block size, it was displayed in the log in a way that made it a little tricky to discover.

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