How to Enable Multi-Writer VMDK Flag on VMware Virtual Machines?Īs i already mentioned, Procedure for enabling multi-writer flag prior and after vSphere 6.0 update 1 is different. We will discuss in detail about enabling multi-writer prior and after vSphere 6.0 Update 1. From vSphere 6.0 Update 1, Support for enabling multi-writer flag on the VMDk virtual disks is included as part of the vSphere Web Client. Prior to vSphere 6.0 Update 1, we need add an configuration entry for each disk in the Virtual machine configuration option. We are running with multiple instance of production Oracle RAC workloads with multi-writer option enabled. Multi-writer option ensures the third-party cluster-aware application such as Oracle RAC, in which the applications ensure that writes originate from two or more different virtual machines, does not cause data loss. Multi-writer VMDK option allows VMFS-backed disks to be shared by multiple virtual machines. VMDK file simultaneously with the help of multi-writer option.
There are some other vSphere technology such as VMware fault tolerance allows 2 virtual machines such as Primary virtual machine and standby virtual machine access the. This prevents the virtual machines accessing other Virtual machines disks (.VMDK files) to avoid data corruption or data loss. It also prevents multiple virtual machine from accessing and writing to the same VMDK (virtual disk). It is a clustered file system shared across multiple esxi host. Diff VCenter 5.5 appliance and vCenter on WIndowsĮSXi host file system (datastore) will be formatted with VMFS file system.
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