By Chris Wolf
Making a digital community offers community directors how to maximize the use of their servers. this can be the one e-book out there that outlines the best way to deal with all elements of virtualization throughout an firm. different books specialize in unmarried features of virtualization, with no delving into the interrelationships of the applied sciences. assurance of all elements of virtualization, together with digital machines, digital dossier structures, clustering, and virtualized garage strategies, will permit readers to appreciate which virtualization applied sciences could be correct for his or her atmosphere.
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Additional info for Virtualization: From the Desktop to the Enterprise (Books for Professionals by Professionals)
Sample text
You can achieve this despite the myriad of disk and controller manufacturers. A virtual disk, whether Small Computer System Interface (SCSI) or Integrated Drive Electronics (IDE), is presented to the guest operating system as a typical disk controller and interface. Virtualization software manufacturers employ just a handful of drivers for guest VMs when creating disks. By using a handful of rigorously tested drivers, VMs don’t have as many problems as traditional operating system drivers. In the next section, you’ll look closely at Microsoft’s and VMware’s implementations of virtual disk types.
Persistent and nonpersistent disks don’t employ snapshots. When you direct VMs to use persistent disk mode, the virtual disk acts like a conventional physical hard disk. Writes are written to the disk without an option for undo and are made at the time the guest operating system writes or removes data. Persistent independent disks can’t be reverted to a previous state after disk writes take place. Whether or not a snapshot is taken, the changes are immediate, and on system reboot the changes still exist.
When preparing to virtualize, remember that more memory, faster processors, and plenty of high-performance hard disk space make for better VMs. Don’t expect to have good or even fair performance from a VM if only the minimum system requirements for the guest operating system are satisfied. It’s always important to check the minimum and best-practice specifications for any operating system prior to installation. When considering host hardware for guest VMs, bigger is better! You can refer to the tables later in this chapter for the minimum physical hardware and host operating system requirements for running VM applications.