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Posts from ‘February, 2009’

An open source read-only VMFS driver for Windows and Linux

Yep, it’s here It’s in beta, so use at your own risk. The obvious idea is that if an ESX host fails, this driver will allow you to pull machines out of it’s datastores. Cheers, Leo

VirtualCenter 2.5 update 4

VMware have just released VC 2.5u4. It’s a pretty standard release with support for Windows 2008 customisations and a better performance summary plugin, but hidden away, is this little gem: Storage VMotion Creates Temporary delta.vmdk Files Only for the Virtual Disks That Are Migrated In previous releases, if a virtual machine has more than one [...]

NFS and ESX

Some people may not know that ESX 3.5 restricts the number of NFS mounts to 8. VMware have a KB article on how to change that limit to 32: Start the VI Client. Select the host from the inventory panel and click Advanced Settings on the Configuration tab. In the Advanced Settings dialog box, select [...]

Free Citrix XenServer

Citrix have announced their free XenServer Enterprise product as promised – it will be available on March 25. However, by downloading the software at htt://www.citrix.com/freexenserver, they will provide you with a license key which will enable the features of Citrix XenServer, and two key of the upcoming Citrix Essentials for XenServer: High availability StorageLink technology [...]

Increase number of VMotions per host

Generally I don’t link to other virtualization blogs without any form of expansion on their articles by myself, but for this gem, I’ll make an exception: Fine tuning concurrent VMotions allowed by vCenter And the relevant stuff from the above article: Here are the steps to increase the amount of Simultaneous VMotion Migrations per Host. [...]

VMFS3 Heap Size – ESX 3.5

As mentioned previously on Yellow Bricks, more than 4TB of open storage (.vmdk files) on each ESX host will cause heap overflows with the following errors logged in the /var/log/vmkernel log: vmkernel: 8:18:59:58.640 cpu2:1410)WARNING: Heap: 1370: Heap_Align(vmfs3, 4096/4096 bytes, 4 align) failed. caller: 0x8fdbd0 vmkernel: 8:18:59:58.640 cpu2:1410)WARNING: Heap: 1266: Heap vmfs3: Maximum allowed growth (24) too small [...]