Acronis International Gmbh

Acronis Inc.

Juri V Tsibrovskyy

Serguei M Beloussov

Maxim V Lyadvinsky

Dennis S Dyatlov

A system, method and computer program product for booting a computer system from the backup and working with the backup as if it were a normal storage device, including loading an initialization application to run in a single thread mode and that identifies a storage media with the backup that includes boot blocks; installing and activating a handler of a Basic Input/Output System (BIOS) interrupt module, for intercepting boot loader requests to the storage media, and for redirecting them to the backup; creating a bitmap of the data blocks stored in the backup and of a writable data storage device to which new data will be written; initiating the BIOS to load and execute the boot blocks from the backup; transferring control to a routine defined by a boot record stored in the backup's boot blocks; installing and activating an I/O filter for intercepting the requests to the writable data storage device, and after a write request is received, the I/O filter writes a corresponding data block to the writable data storage, and marks this data block in the bitmap to indicate that this block is stored on the writable storage device; after a read request is received, the I/O filter checks the bitmap to see if this data block was not changed, and redirects the read request to the backup to read the data block, and if the requested data block was changed and written to the writeable data storage device, then the I/O filter redirects the read request to the written blocks on the writeable data storage device.

System and method for booting a computer from backup

Continuous data protection is performed as two parallel processes: copying a data block from the storage device into the backup storage device (creating initial backup) and copying the data block to be written to the data storage into the incremental backup. When a write command is directed to a data storage block, it's intercepted and redirected to the backup storage, and data, which is to be written in accord to the write request, is written to the incremental backup on the backup storage. If write command is also directed to a data storage block identified for backup that has not yet been backed up, the identified data storage block is copied from the storage device to the intermediate storage device, the write command is executed on the identified data storage block from the storage device, and the data storage block is copied from the intermediate storage device to the backup storage device. In case of an error accessing a block on the storage device, the block is marked as invalid. The system suspends a write command to the storage device during the initial data backup process if the intermediate storage device has reached a selected data capacity; and copies a selected amount of data from the intermediate storage device to the backup storage device.

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Moscow, Russia

Juri V Tsibrovskyy