Dell FS7500 Manuale - Pagina 7
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Dell EqualLogic FS7500 – Unified block and file storage for virtual workloads
WMware I/O stacks
Figure 1.
In a SAN, when the VMware hypervisor is using the block-based FC, FCoE, or iSCSI protocol, it creates a
VMFS file system on a storage volume (shown as VMFS Volume in Figure 1) to organize and store
VMware files. The VMFS file system logic runs on the VMware server.
Unlike SAN, in a FS7500 NAS, when the VMware hypervisor is using the NFS protocol, the NFS services
running on the FS7500 controllers are responsible for running the file system logic.
NFS is a file-based protocol that can be used to establish a client-server relationship between VMware
vSphere hosts and a NAS storage system. NFS services running on the NAS device are responsible for
managing the layout and structure of the files and directories on physical storage (shown as NFS Export
in Figure 1). NFS services are also used for coordinating simultaneous storage access from multiple
servers. vSphere hosts use these services to provide shared access for VMware VMs similar to that
provided by VMFS when used with block storage.
VMware has built full NFS support into the vSphere disk virtualization layer. VMware supports all major
features such as VMotion™, VMware snapshot, VMware HA, and VMware DRS using NFS exports, at parity
with VMFS volumes. This white paper is primarily concerned with NFS.
From a technical perspective, the VMware hypervisor typically abstracts the I/O operations generated
by the VM and processes them in a virtual disk file known as a VMDK file. This VMDK file is stored in a
datastore presented to the ESXi host server. A datastore is a storage volume or file system repository
that may contain the configuration and data files of one or more VMs. These datastores may either be
block-based VMFS volumes (using iSCSI/FC/FCoE protocol) or file-based NFS exports (using the NFS
protocol). In either case, from a functional point of view the VM is unaware of the underlying storage
mechanism because the hypervisor handles all the I/O processing on the virtual machine's behalf.
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