By David Marshall
This publication used to be first released 3/17/2006, considering that then, virtualization has advanced, new types have been published and new applied sciences have emereged. The ebook talks approximately VMware GSX which was once discontinued over a 12 months in the past, ESX 2.5 (Current model is 3.5 with 4.0 round the nook) and MS digital Server that's being changed with Hyper-V on home windows Server 2008. No point out of any opensource alternative (Like Xen) which wasn't mainstream in '06 but. a very good learn in case you are attracted to the heritage of virtualization.
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Extra info for Advanced Server Virtualization: VMware and Microsoft Platforms in the Virtual Data Center
Depending on the virtualization platform and its conﬁguration, it is possible for instructions from a single virtual processor to be executed sequentially across one or more physical processors in the host server. This is not in any way multiprocessing, as the instructions are not executed in parallel, but it can be performed in order to optimize the processor resource scheduler in the VMM and to help increase virtual machine performance. Virtualization platforms often allow a conﬁguration setting per virtual machine called CPU aﬃnity that deﬁnes which physical processors in the host server may be used to execute instructions issued by a virtual machine.
The ﬁles contain the stored image of an entire hard disk drive and appears as a single hard disk drive to the guest operating system. The virtual hard disk drive is typically created by the virtualization platform, usually through its management interface, and at the point of creation, its interface (IDE or SCSI) and the disks size must be speciﬁed. The newly created virtual hard disk drive is initially empty and unformatted, just as if it were a new physical hard disk drive. An interesting aspect of virtual hard disk drives is that the interface of the hard disk drive is completely independent of the physical hardware used by the host server, which means that if host server only supported IDE hard disk drives, it is possible to create SCSI virtual hard disk drives as long as the virtualization platform supports SCSI virtual hard disk drives.
Electrical isolation in hardware partitioning systems allows a hardware fault to occur in one hard partition while not aﬀecting any other hard partition in the same system. Systems oﬀering hardware partitioning technologies are usually mid-range to high-end computing systems that are generally very scalable (usually scaling up) and robust. Hardware partitioning systems have several disadvantages: expensive, proprietary hardware and software, additional costs incurred by the support and maintenance of the proprietary hardware, limited support for various operating systems, limited hardware portability for an existing installed base of hard partitions, and vendor lock-in.