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Section 12 Storage Area Network
Virtual machines can either be stored on hard disks local in the ESX(i) server, or on
a network storage device such as a Storage Area Network (SAN) server. In both
cases, the storage is added to the ESX(i) server and seen as datastores.
One advantage of having the virtual machines stored on a SAN server is that the
virtual machines can be moved from one ESX(i) server to another. Since both
ESX(i) servers have access to the same shared storage, it is only the execution
context that needs to be moved rather than the much larger virtual machine hard
disk.
This guide provides an overview of SAN and how it is used with VMware vSphere.
While SAN servers support either Fiber Channel, iSCSI, or both, this guide only
provides information on iSCSI. Most major server vendors also supply SAN
servers. The specific configuration of each SAN type is not documented here. Refer
to the vendors specific guides for individual device configuration details.
It is essential that the configuration used is confirmed to function as expected
before used for production. This includes using the performance monitors in the
ESX(i) servers to ensure that load balancing is operational and to ensure that
network redundancy is working by temporarily removing network connections.
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