System and method for high performance enterprise data protection
View Patent ↗High performance, enterprise-level data protection system and method provides efficient block-level incremental snapshots of primary storage devices, and instant availability of such snapshots in immediately mountable form that can be directly used in place of the primary storage device. Related systems and applications are described, including an “Enterprise Image Destination” (EID) for backup images; a mirroring technique whereby a replacement physical primary facility may be created while working with a second storage unit as the primary source file system; and a technique for eliminating redundant data in backup images when multiple systems with partially common contents (e.g., operating system files, common databases, application executables, etc.) are being backed up. A number of examples showing “Fast Application Restore” (FAR) with the use of the invention are also provided.
1. A method for making a backup copy of a primary system, that is mountable on the same or other computer system on an immediately available basis, and for providing an immediately available restoration of said backup copy to a restoration system, comprising:
providing a base-level snapshot, stored on a secondary system, of the primary system;
providing block-level incremental snapshots of the primary system, stored on the secondary system, representing only the blocks that have changed since the prior snapshot, wherein the base-level and block-level incremental snapshots of the primary system further comprise application-specific metadata;
constructing a read-only logical disk image from at least one of said snapshot images;
transforming aid the read-only logical disk image into an iSCSI addressable read-write LUN by creating a sparse file backed by the read-only logical disk image, and exposing the LUN; and
mapping the restore volume to the local namespace of the restoration system, so that it can be used as a mounted restore volume containing both backup data and application-specific metadata.
2. A method for making a backup copy of a primary system, that is mountable on the same or other computer system on an immediately available basis, and for providing an immediately available restoration of said backup copy to a restoration system, and restoring to the restoration system a primary storage device capable of aggregating changes as well as retaining original unchanged data from a read-only backup image, comprising:
providing a base-level snapshot, stored on a secondary system, of the primary system;
providing block-level incremental snapshots of the primary system, stored on the secondary system, representing only the blocks that have changed since the prior snapshot, wherein the base-level and block-level incremental snapshots of the primary system further comprise application-specific metadata;
constructing a read-only logical disk image from at least one of said snapshot images;
exposing the read-only logical disk image as a LUN containing both backup data and application-specific metadata;
mapping the restore volume to the local namespace of the restoration system;
mounting the restore volume on the restoration system; and
using the LUN as primary storage.
3. A method for making a backup copy of a primary system, that is mountable on the same or other computer system on an immediately available basis, and for restoring a backup copy in operations under a virtualization server, on a virtual machine running on said server, comprising:
providing a base-level snapshot, stored on a secondary system, of the primary system;
providing block-level incremental snapshots of the primary system, stored on the secondary system, representing only the blocks that have changed since the prior snapshot;
constructing a logical disk image from at least one of said snapshot images that can be used as a mounted storage unit;
exposing the logical disk image as a LUN to create a restore volume; and
mapping the restore volume to the local namespace of the virtual machine.
4. A method for rapidly performing a restore operation on an application on a target node, from a set of one or more backup images, for use in the case of recovery from a failure, comprising
selecting said backup images;
creating addressable virtual storage LUNs from said images on an on-demand basis;
making the LUNs visible to the target node;
attaching the LUNs as local disks on the restore target via iSCSI protocols;
programmatically recovering the application using appropriate application-specific APIs; and
applying application-specific log files to roll said restore operation forward to the point of failure.