Performance impact when using VMware snapshots

Using vmware and snapshots? You probably know about vmware best practices about snapshots, which includes

  • The maximum supported amount of snapshots in a chain is 32. However, VMware recommends that you use only 2-3 snapshots in a chain.
  • Use no single snapshot for more than 24-72 hours. Snapshots should not be maintained over long periods of time for application or Virtual Machine version control purposes.
  • An excessive number of delta files in a chain (caused by an excessive number of snapshots) or large delta files may cause decreased virtual machine and host performance.
  • Be especially diligent with snapshot use on high-transaction virtual machines such as email and database servers

But what is real performance inpact of snapshot?

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Big XFS filesystem NFS export mount fails with stale nfs handle

If you have big XFS filesystem (with lot of files) and you use inode64 mount option, exporting this file system using NFS may fail when mouting this export on client:

Stale NFS file handle

This error is strange and confusing. Workaround is to specify fsid in /etc/exports for this filesystem.

For more information check this nice blog article https://hpc.uni.lu/blog/2014/xfs-and-inode64/