XenServer_Virtual_Machine_Backup_NBU.pdf - WHITE PAPER | Citrix XenServer Virtual Machine Backup Citrix XenServer Virtual Machine Backup www.citrix.com

XenServer_Virtual_Machine_Backup_NBU.pdf - WHITE PAPER |...

This preview shows page 1 - 5 out of 16 pages.

WHITE PAPER | Citrix XenServer: Virtual Machine Backup Citrix XenServer Virtual Machine Backup
Background image
Page 2ContentsIntroduction and Overview..............................................................................................................................3Hot Backup Approaches..................................................................................................................................3Agent Based Backup..................................................................................................................................................3Backend Storage Replication.....................................................................................................................................4Manual SnapshotsXenCenter.................................................................................................................................5Scripted Snapshots through XenAPI..........................................................................................................................5Enhanced Backup Enablement with Third Party Backup Products............................................................................6Enhanced Backup Enablement with Symantec NetBackup........................................................................7Solution Overview.....................................................................................................................................................7XenServer Configuration..........................................................................................................................................13Symantec NetBackup Configuration........................................................................................................................14
Background image
Page 3Introduction and Overview There are several ways of backing up virtual machines (VMs) running on Citrix XenServer. At a high-level, there are three categories for VM backups: Cold Backups Warm Backups Hot Backups Cold backups and warm backups are supported in XenServer through the XenCenter export and copy capabilities as well as through scripting from the command-line interface (CLI). The primary focus of this document is hotbackups, whereby virtual machines can be backed up without incurring downtime. Hot Backup Approaches A hot virtual machine backup is a way of backing up a VM without incurring any downtime for the system. With XenServer, there are several ways of conducting hot backups. Agent-based backup Backend storage replication Manual snapshots, from XenCenter Scripted snapshots through XenAPI XenServer’s enhanced backup enablement feature, with a third party backup product In the next section, these approaches are discussed in more detail. Agent Based Backup An agent based backup is the traditional way of performing file and full-system backups. In this scenario, a backup agent is installed in the VM guest operating system. A backup job or policy is defined in the backup software, and during the defined backup window the agent starts copying files to the desired backup server/backup medium. This solution offers simple file-level restore functionality, and many backup vendors have tailored their solutions to the backup needs of specific applications. For example, some vendors have engineered their backup agents for complex applications like Microsoft Exchange or SQL Server. Although this method is proven to be very reliable, by default it does not benefit from any of the advanced features offered by an enterprise level virtualization platform. An implementation like this is the same as for a physical server environment.
Background image
Page 4Pros: Proven technology and approach Protects investment in current backup solution and knowledge Easy file-level restoration Agents tailored to specific applications Cons: Long backup window can affect service-critical VMs Not specifically geared for virtual machines Backend Storage Replication When using Citrix XenServer with a shared Storage Repository (SR), it is possible to use a storage replication mechanism on the storage backend. Most NAS and SAN storage vendors offer solutions which can replicate data from one storage array to another, at the volume or LUN level. Third-party technologies for data replication are also widely available.
Background image
Image of page 5

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture