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Can only mount 8 nft shares on vmware 6.0 update#

Can only mount 8 nft shares on vmware 6.0 update#

In ESXi versions, prior to ESXi vSphere 6.0 update 1, MultiWriter mode for vmdk is also supported, but you cannot enable it from the vSphere Client interface. Therefore, if you added SCSI Controller 1 when creating a SCSI controller, you should select it.įor example, if you have a new address SCSI(1:0) on VM (node1) for a new disk (this means the first disk on the second SCSI controller), you should use the same address SCSI(1:0) for the shared disk on the second VM (node2). Make sure that you use the same SCSI device address for a shared vmdk disk on both virtual machines. One controller can serve up to 16 different drives. If you want to use more than one shared disk on VMware, keep in mind that each of them does not require the addition SCSI controller. You also need to select the Sharing mode – Multi-Writer for this disk. In the submenu, select the name of the first virtual machine and in the middle pane select the desired vmdk disc file. In the menu that appears, select the VMFS Datastore, which stores the shared disk you created earlier. After that in the settings of the second virtual machine you need to add a new disk (Existing Hard Disk).

In the same way, you need to add a new SCSI controller to another virtual machine (Node 2).

Disk mode: Independent – Persistent – in this mode, you can’t create snapshots for a virtual drive you want to share.

Virtual Device Node: select created earlier SCSI controller.

Note that you can convert thick provision lazy zeroed disk to Thin.

Disk Provisioning: select Thick provision eager zeroed (another disk provisioning modes are not suitable).

Location: you need to select a shared datastore name, that will store the vmdk file.

Next, you need to add a new virtual drive on the first VM ( New Device > New Hard Disk > Add) with the following disk settings: Physical – used when you need to share vmdk file between VMs on different ESXi hosts. Virtual – if you want to share a virtual disk between VMs on the same ESXi host Now you need to choose the desired SCSI Bus sharing mode: To add a new virtual device select the SCSI controller in the dropdown list and press Add button.Īs a type of SCSI controller, select LSI Logic SAS (be sure to create a new SCSI controller, don’t use a SCSI 0 controller). In the vSphere Client inventory select first virtual machine (Node 1), right click on it and select Edit Settings. On both virtual machines, you need to add a new SCSI controller. Suppose the shared external storage (connected to each ESXi host using iSCSI or Fibre Channel SAN) has already presented to all VMWare ESXi hosts, which are running the two VMs (node1 and node2) you want to add a shared virtual drive. The Multi-Writer option ensures that a cluster-enabled application ( Oracle RAC, Microsoft MSCS) when writing from two or more virtual machines doesn’t cause data loss. This protects data stored on a virtual disk from damage caused by multiple write programs on non-cluster file systems.

You cannot expand such a VMDK disk online.īy default, VMware vSphere doesn’t allow multiple virtual machines to open the same virtual machine disk ( VMDK) in read and write mode.Those, the Multi-Writer VMDK technology is needed just for clustering, and it’s impossible to use it as a shared disk with automatic file synchronization. If you try to write data to such a vmdk from the guest operating system, for example, create a folder, this folder will be visible only on the host that created it.You can migrate between ESXi hosts only powered off virtual. You won’t be able to perform the online migration of such VMs (neither vMotion nor Storage vMotion).The main limitations of shared VMWare disks in Multi-Writer mode: In most cases, this mode of operation of shared disks is used in cluster solutions Oracle RAC and Microsoft MSCS cluster. Virtual disks, which must be available simultaneously in several VMWare virtual machines, use the Multi-writer technology (available in VMware ESXI 5.5 and higher). A shared 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 drive on different ESXi hosts, you can only use the shared VMFS (datastore) or SAN/iSCSI storage. The most optimal way is to use the vmdk disk physically located on the shared storage or locally on the ESXi host. In some cases (as a rule in clustering scenarios) it may be necessary to share the same disk ( vmdk or RMD) between 2 (or more) virtual machines (VMs) on VMWare ESXi.