VMware VSphere 5.0 Storage

Data storage is a virtual representation of the integrated physical storage resource portfolio in the datacenter. These physical storage pools may come from the server's local SCSI, SAS or SATA disks, Fibre Channel SAN disk arrays, ISCSI SAN disk arrays, or network attached storage (NAS) arrays. Because of the cost of storage for virtualization and the rapid expansion of virtual machines, it is important to use storage space efficiently. VMware Vsphere provides host-level storage virtualization that logically abstracts the physical memory layer from the virtual machine, while the virtual machine uses the hard disk to store data, operating systems, program files, and so on, without needing to know the complexity and specificity of the storage devices attached to the ESXi host.

Each data store is a physical VMFS volume on a storage device. The NAS data store is an NFS volume with a VMFS feature. Data storage can span multiple physical storage subsystems. When a VMFS volume can contain one or more LUNs from a local SCSI disk array on a physical host, a Fibre Channel SAN disk farm, or an iSCSI San disk farm. New LUNs added to any physical storage subsystem can be detected and can be used by all existing data stores or new data stores. You can extend the memory capacity on previously created data stores without shutting down the physical host power or storage subsystem. If any LUNs within a VMFS volume fail or are unavailable, only those virtual machines that use this LUN are affected, except for LUNs with the first data area of the spanned volume. All other virtual machines that are part of a virtual disk that reside on another LUN will continue to run.

Virtual machines can access each virtual disk through one of these virtual SCSI controllers, while the virtual disk resides on a vsphere virtual machine file System (VMFS) Datastore, on NFS-based data stores, or on bare disks. From a virtual machine perspective, each virtual disk looks like a SCSI controller attached to a SCSI controller. The actual physical disk device is accessed through a SCSI, ISCSI, network, or Fibre Channel adapter on the host, which is transparent to the client operating system and the applications running on the virtual machine. ESXi supports a variety of internal or external local storage devices, including SCSI, IDE, SATA, USB, and SAS storage systems. Regardless of the type of memory used, the host hides the physical memory layer from the virtual machine.

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Each virtual machine can be stored in a directory of data stores as a set of files. The disk storage associated with each virtual customer is a set of files in the client directory. Virtual disks can act as normal files on the client disk storage, copy, move, or back up disk storage, and add new virtual disks to the virtual machine without shutting down the virtual electromechanical source. Without shutting down the virtual machine power, a virtual disk file (. vmdk) is created in the VMFS to provide new storage for added virtual disks or existing virtual disk files associated with virtual machines in the menu bar, click Home, clicking Inventory, then "data storage and data storage cluster" You can manage all of the vsphere hard drives and storage in the storage interface. Click the store you want to manage to browse the information on this data store,

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VMware VSphere 5.0 Storage