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Necessary cookies are absolutely essential for the website to function properly. The issue has been resolved starting from the following ESXi versions Īs a workaround, disabling “IO coalescing” for SEsparse can be carried out on host system level.įor more information, please refer the KB So basically if the VM size is more than 2TB in size and the VMFS versions are VMFS5 & VMFS6, there might be data corruptions on the infrastructure. Impacted vSphere releases: vSphere 6.5 and above with VMFS-6 and any VM with snapshots | vSphere 5.5 and above when VMs with virtual disks >2TB have snapshots. SEsparse is the default format for all snapshots on VMFS-6 datastores. On VMFS-5 and NFS, the SEsparse format is used for virtual disks that are 2 TB or larger VMFS-5 or NFS Datastores: VMs with virtual disks >2TB and snapshots. (SEsparse is a snapshot format introduced in vSphere 5.5 for large disks, and is the preferred format for all snapshots in vSphere 6.5 and above with VMFS-6) The VM fails to boot when it is running from an SEsparse snapshot.
Applications such as databases may report block-level data inconsistency.I researched on the issue and finally found out that this is a known issue on some VMWare versions. I faced with the same issue on ESXi 6.5 environment. There are some cases where due to VMware snapshot consolidation the VM disk systems get corrupted.
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