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CHAPTER 1 VMware VSphere 4 OVerView
VMw a r e hi g h aV a i l a b i l i t y
VMware High Availability (HA) extends high availability for any application running in a
virtual machine, regardless of its operating system or underlying hardware configuration
(Figure 1.13). VMware HA automatically detects physical server failures and operating system
failures within virtual machines. If a failure is detected, VMware HA automatically restarts the
affected virtual machine on a different ESX server in the resource pool. When restarting the
affected virtual machines, you can also leverage DRS to take into account ESX host workload.
The time it takes to reboot the virtual machine and restart the application is the only down-
time that you will experience. VMware HA supports up to 32 ESX servers in a cluster. You can
reserve a specific cluster capacity for failover or mark specific ESX servers as failover hosts.
VMware HA can be a much simpler and cost-effective high-availability solution compared to
traditional clustering solutions.
Figure 1.12
Storage VMotion,
virtual disk format
conversion
Figure 1.13
VMware HA
settings
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