When RamDisks Get Full | PlanetVM

This is just the sort of cool technical tip that saves your bacon when it’s lodged somewhere in your mind: What happens when the VMware ESXi RAMdisk gets full? Here’s Tom Howarth’s account…

After upgrading to ESXi 5 we saw several instances of host instability as the Ramdisk ram out of space, symptoms including :-

  • Changes to VM settings failing
  • VMotion to or from the server failing (so we couldn’t put the server into Maintenance Mode for a safe reboot)
  • Local logs not updating
  • Host reporting as disconnected status within vCenter

About the author

Stephen Foskett

Stephen Foskett is an active participant in the world of enterprise information technology, currently focusing on enterprise storage, server virtualization, networking, and cloud computing. He organizes the popular Tech Field Day event series for Gestalt IT and runs Foskett Services. A long-time voice in the storage industry, Stephen has authored numerous articles for industry publications, and is a popular presenter at industry events. He can be found online at,, and on Twitter at @SFoskett.

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