HP StorageWorks 6000 HP StorageWorks VLS and D2D Solutions Guide (AG306-96028, - Page 65
Introduction to VMWare Terminology, Zero Downtime Backup and Instant Recovery
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co-location of units and then splitting of units, or by using physical tape to transfer data from remote office to seed unit in data centre. This process only has to be done once. Other information: WAN link sizing and data centre D2D sizing is critical. Size for existing link or new link using the HP StorageWorks Backup Sizer. Introduction to VMWare Terminology Figure 22 VMWare Infrastructure Environment . The above diagram shows the different components that make up a virtualized server environment and its connections to external primary storage and data protection devices. ESX acts as a hardware extraction layer on one side providing virtual resources to the VM machines whilst on the other side interfacing to the physical hardware. In this next set of solutions we will talk about possible methods of providing data protection to this virtualized environment: • Base Support - Agents inside Virtual Machines • Virtual Machine snapshots - ESX Console • Virtual Machine snapshots - VCB • Zero Downtime Backup and Instant Recovery Each technique has its pros and cons as listed below. It is important to point out that "snapshot" backups (sometimes called image or point-in-time backups) cannot always provide single file restore capability (for example with Linux the whole image has to be restored). In addition, snapshots are not best suited to complex online backups of applications such as Oracle, SQL, and Exchange because they do not quiesce the application in the appropriate way before taking the snapshot. Snapshots are best suited to being aligned with a VMWare machine OS where the whole environment can be captured in a single image. HP StorageWorks VLS and D2D Solutions Guide 65