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Storing ESXi coredump and scratch partitions in vSAN (2074026)

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vSAN provides the following storage solutions for ESXi coredump and scratch partitions:
  • Assign one disk for each host. When you install vSAN on a local disk, a disk is automatically assigned to the host. Use this approach for hosts with more than 512GB of memory.
  • Use a USB or SD card and do not set scratch partitions as non-persistent. vSAN tracefiles take up space in a coredump, so a 4GB SD or USB card is sufficient to support coredumps for hosts with up to 512GB of memory rather than 1TB for hosts without vSAN.

Note: vSAN does not support having scratch log on the vSAN Datastore. For more information, see Redirecting system logs to a vSAN object causes an ESXi host lock up (2147541).


Using a USB or SD card for ESXi installations, coredump partitions, and a non-persistent scratch partitions has the following drawbacks:
  • vSAN tracefiles are stored in a virtual RAM drive that is persisted only in case of host failure. All other log files are stored in a non-persistent virtual RAM drive. 
  • Use a 4GB SD card or USB drive for coredumps on hosts with 512GB of memory and where vSAN is enabled.  
  • vSAN cannot recover tracefiles or any other log files, in case of a power loss.

Additional Information

For translated versions of this article, see:

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