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Tech Update
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Virtual server products compared
By ZDNet Staff
November 15, 2002

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In this chart, we compare the functionality of the three main Intel server virtualization products from VMware, SWsoft, and Connectix.
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VMware
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Connectix/ Virtual Server
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Swsoft Virtuozzo
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| Host OS
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GSX Server: Windows NT, 2000, 2000 Advanced, .Net servers; Red Hat Linux, Mandrake Linux, TurboLinux, SuSE Linux, SuSE Linux Enterprise Server 7
ESX Server: Not applicable
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Windows .Net Server 2003
Windows 2000 servers
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Any version of Linux; FreeBSD
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| Guest OS
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GSX Server: Windows NT, 2000, and .Net servers, Windows XP Home/Professional, Windows 2000 Professional, Windows 95/98/98SE/Me, Windows for Workgroups, Windows 3.1, MS-DOS 6.22; Mandrake Linux, Red Hat Linux, SuSE Linux, SuSE Linux Enterprise Server 7, TurboLinux, FreeBSD
ESX Server: Windows 2000 Server, Windows NT4, Red Hat Linux, SuSE Linux, FreeBSD
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Windows NT, 2000, and .Net servers, Windows XP Home/Professional, Windows 2000 Professional, Windows 95/98/98SE/Me, Windows for Workgroups, Windows 3.1, MS-DOS 6.22; Mandrake Linux, Red Hat Linux, SuSE Linux, SuSE Linux Enterprise Server 7, TurboLinux, FreeBSD, Netware, OS/2, Solaris x86
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Any version of Linux (disparate concurrent versions supported) with Linux host OS; FreeBSD with FreeBSD host OS
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| Host RAM
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GSX Server: 256MB min, 8GB max
ESX Server: 256MB min, 64GB max
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64GB max
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No minimum or maximum
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| VM/VE RAM
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GSX Server: 2GB max
ESX Server: 3.6GB max
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3.6GB max
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64GB max, across 16 CPUs
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| Concurrent VMs/VEs
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GSX Server: 4 per CPU, 16 max
ESX Server: 8 per CPU, 64 max
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64 max
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Up to 2,500 on one physical server
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| Extensibility
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GSX Server: COM/Perl API scripting
ESX Server: API scripting
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COM API scripting
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API scripting, templating
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