Presentation on theme: "Why Virtual Machine Backups Are Different David Davis Blog:"— Presentation transcript:
Why Virtual Machine Backups Are Different David Davis Twitter: @davidmdavis Blog: www.VMwareVideos.com
About the speaker Previous VMware Customer, IT Manager, Server & Network Admin with 18 years in IT Contributor to industry publications
Agenda Hardware Independence Image Level vs. File Level Backups Change Block Tracking (CBT) New Possibilities With VM Backups – Fast Restore, Replication, Virtual Lab, and more Traditional Backup Doesn’t Understand Virtualization What is the Right Tool for the Job?
Hardware Independence Totally different approach required for virtualization Traditional architecture
Hardware Independence Abstracts OS from being tied to the hardware Guest OS now uses virtual hardware that works no matter the underlying server hardware Allows you to move VMs from server to server (within processor family) Hardware independence makes the benefits of virtualization possible Completely changes how you should look at backup
Image Level vs. File Level Backups With virtualization, you can backup the entire “image” of the server No agent is required in the guest OS No load is put on the guest OS No end users are affected when the backup occurs Backing up the image of the server is much faster and less disruptive than backing up the files in the guest OS Image level restores are much faster Restore Backup Restore options and speed are critical
Change Block Tracking (CBT) With VMware ESX/ESXi 4.0 or later and virtual machine HW version 7 or later, change block tracking is possible Virtual machine disk blocks that are changed are tracked outside of the guest OS CBT allows virtualization backup software to backup only the changed blocks (software that takes advantage of this feature) Allows backups to only process changed blocks
New Possibilities with VM Backups VM portability (HW independence) vMotion / svMotion / DRS / VMHA Fast backup (change block tracking) Fast restore (mount for backup repository & image level restore) Simplified disaster recovery Replication of only changed blocks to DR site Virtual Lab using backups of production VMs for test & development All made possible with use of virtualization
Traditional Backup Doesn’t Understand Virtualization You need backups of the VMDK (virtual machine disk) as well as the VMX (virtual machine configuration)
Traditional Backup Doesn’t Understand Virtualization The VMX contains the VM’s virtual hardware and configuration
Traditional Backup Doesn’t Understand Virtualization Virtual machines move around thanks to vMotion and Distributed Resource Scheduler (DRS)
What We Covered Hardware Independence Image Level vs. File Level Backups Change Block Tracking (CBT) New Possibilities With VM Backups – Fast Restore, Replication, Virtual Lab, and more Traditional Backup Doesn’t Understand Virtualization What is the Right Tool for the Job?
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