Virtualization shoot-out: Citrix, Microsoft, Red Hat, and VMware

The leading server virtualization contenders tackle InfoWorld's ultimate virtualization challenge

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Virtualization shoot-out: Citrix, Microsoft, Red Hat, and VMware features

 Citrix XenServer 5.6.1Microsoft Windows Server 2008 Hyper-V R2Red Hat Enterprise Virtualization 2.2VMware vSphere 4.1
Bare-metal hypervisorYesYesYesYes
vCPUs per host512512512512
vCPUs per VM8 Windows / 32 Linux41616
RAM per host512GB1TB1TB1TB
RAM per VM32GB64GB256GB255GB
Memory overcommitmentYesYesYesYes
Page sharingNoNoYesYes
Virtual NICs7 per guest8 synthetic, 4 emulated8 per guest10 per guest
VLAN supportYesYes (but with separate guest config)YesYes
Guest OS supportCentOS, Debian, Red Hat, Suse, WindowsRed Hat, Suse, WindowsRed Hat, WindowsMost x86 operating systems
Live migrationsYesYes (requires Windows Clustering)YesYes
Live storage migrationsNoNo (but can automate with VM suspend)NoYes
Load balancingYesYesYesYes
High availabilityYesYesYes (but not for complete host failure)Yes
Maintenance mode for hostsYesYesYesYes
Templating and cloningYesYesYesYes
Thin provisioned VM disksYesYesYesYes
VM import/exportYesYesYesYes
SnapshotsYesYesYesYes
Remote consoleYesYesYesYes
PXE boot for VMsYesYesYesYes
Shared storageYesYesYesYes
Storage multipathingYesYesYesYes
Shared resource poolsYesYesYesYes
APIYesYesYesYes
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