The Multi-Writer option ensures that a guest host clustering application (such as Oracle RAC or Microsoft MSCS) doesn’t cause data loss when accessing from two or more virtual machines (cluster nodes). This feature is called Multi-writer VMDK. However, there is a VMware technology that allows sharing of VMFS-backed disks between several VMs. This prevents VMs from accessing other virtual machines’ disks and avoid data corruption or loss.
vmdk file simultaneously (locks are used).
By default, VMFS, NFS datastores, vSAN are not allowing multiple virtual machines to access the same. VMware VMFS is a clustered file system shared between multiple ESXi hosts. A shared virtual disk is a VMDK file that two or more virtual machines can read and write at the same time. If you want to use the shared disk on different ESXi hosts, you can use only the shared VMFS (datastore), or SAN/iSCSI/vSAN storage. You can share the vmdk file located on the shared storage, or on a local datastore on the ESXi host. This configuration is most commonly used in clustering scenarios. In some cases, it may be necessary to share the same virtual disk (vmdk or RMD) between 2 (or more) virtual machines (VMs) running on VMWare ESXi hosts.
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