Ca, Inc.

International Business Machines Corporation

Shaorong Li

Haiyang Zhang

Xiaopin Wang

Guoxian Shang

Yi Guo

Guodong Li

Victor Liu

Gongjun Fei

Hector Wang

Gong Jun Fei

Xiaopin (Hector) Wang

Mingquan Rao

Youcheng Yang

Systems and methods for replicating data from a production server to a backup server include recording at least one operation on one or more data items stored in a volume of a production server. The operation may be recorded as at least one journal event in a memory. A determination may then be made regarding whether a system malfunction incident has occurred in the production server and if so, a first set of journal events may be transferred from the memory to an auxiliary storage at a first time instant. At a second time instant, a second set of journal events recorded in the memory between the first and second time instants may be transferred to the auxiliary storage. At one journal event stored in the auxiliary storage unit may then be sent for replication to a backup server.

Periodic data replication

A method, a computing system and a computer program product are provided. A first process of multiple processes sets access rights regarding a shared memory buffer from a shared memory to read/write, the shared memory buffer having been allocated and provided to the first process by a second process of the multiple processes. The first process sets access rights regarding a supplemental memory area of the shared memory buffer to no access, the supplemental memory area being before a usable buffer portion of the shared memory buffer, after the usable buffer portion of the shared memory buffer, or both before and after the usable buffer portion of the shared memory buffer. The first process stops executing when the first process attempts to access any portion of the supplemental memory area.

Detection of over-access of memory shared among multiple processes

Synchronizing hard link files on master and replica servers includes providing master and replica server hard link file snapshots. The master server hard link file snapshot includes a listing of hard link file names from a root directory of the master server. The replica server hard link file snapshot includes a listing of hard link file names from a root directory of the replica server. The master server hard link file snapshot and the replica server hard link file snapshot are compared. A synchronized hash map linked list may be generated responsive to the comparison. The synchronized hash map linked list includes a listing of group identifications corresponding to physical data files at the master server. For each group identification in the synchronized hash map linked list, the synchronized hash map linked list includes at least a hard link file name from the root directory of the master server.

Methods of synchronizing files including synchronized hash map linked lists and related data processing nodes

A data replication system and method is disclosed in which a master file server uses a first filter in a kernel space to intercept file I/O events, send the file I/O events over a first network, for example a local area network, to a second filter in a kernel space of a first replica file server, and submit the file I/O event to a file system program in user space of the master file server to be processed. The second filter records the file I/O event in a memory of the second file server and sends an acknowledge message to the first filter indicating the file I/O event received by the second filter has been recorded in the replica file server. The first filter notifies user land in the first file server that the file I/O event has been processed if the first filter has received the acknowledge message and the file system program has completed processing the file I/O event in the first file server. In one embodiment, a data replication engine in the first replica file server replicates data stored in the first replica file server to a second replica file server in a location remote from the second replica file server, using a second network, for example a wide area network.

High availability data replication

A method includes identifying a first boot configuration type for a disk image. The disk image includes a master boot record and a disk partition. The disk partition comprises a volume boot record. The master boot record comprises first instructions for loading an operating system, and the volume boot record comprises second instructions for loading the operating system. The method further includes receiving an input indicative of a second boot configuration type. The method also includes modifying the disk image to use the second boot configuration type to load the operating system by modifying the first instructions and the second instructions.

Modifying disk images

A system and method creates a directory snapshot. The method includes retrieving a group of filenames from a directory, splitting the group of filenames into a first plurality of filenames and a second plurality of filenames, and storing the first plurality of filenames into a first temporary snapshot file and storing the second plurality of filenames into a second temporary snapshot file. The filenames in the first and second temporary snapshot files are sorted based on the same heuristic and a sorted linked list that includes a filename listed first in the first temporary snapshot file and a filename listed first in the second temporary snapshot file is created. A first filename from the sorted linked list is saved to a result directory snapshot file.

Systems and methods for directory snapshot

Various embodiments illustrated and described herein include systems, methods, and computer program products to protect NTFS deduplicated volumes. Some embodiments select a data protection mode from various modes to protect deduplicated volumes. Some data protection modes retrieve the deduplicated files and associated data chunks without rehydrating the files and send them to a replica. Some data protection modes rehydrate deduplicated files as they are retrieved, send the rehydrated files to the replica, and turn on deduplication at the replica so the files can be deduplicated on the replica. Deduplication settings can also be transferred to the replica so that deduplication on the replica mimics deduplication on the source. Some data protection modes replicate the deduplicated files to the replica.

Replication and synchronization for protecting NTFS deduplication volumes

Systems and methods for replicating data from a production server to a backup server include identifying one or more data blocks of a file that were modified after a first time instant and before a second time instant. The file may be associated with a protected directory of the production server. An representative data block (e.g., including a hash value) for at least one of the identified data blocks may be computed using a cryptography algorithm, e.g., MD5 or SHA-1. The computed cryptographic data block representing the identified data block may then be sent for replication to the backup server. An operation performed between the first time instant and the second time instant on one or more files of the protected directory may be recorded, and sent to the backup server.

Block level data replication

Journal event consolidation extracts events occurring between two predetermined point in time on data volume, categorizes the events into categories of events, and consolidates the events in the categories of events.

Journal event consolidation

Systems and methods for generating a bookmark for a snapshot of one or more volumes of a production server include initiating a snapshot process to capture a shadow copy of a snapshot-volume set, which includes one or more volumes of the production server. The snapshot process (e.g., Volume Shadow Copy Service of Windows&#x2122; operating system) may include (a) temporarily freezing operations on a file system of the production server, and (b) releasing a freeze of operations on the file system of the production server. A bookmark for the shadow copy (representing a consistent state of the associated volumes) may be generated such that the bookmark corresponds to a completion of the temporarily freezing or releasing a freeze of the operations. The bookmark may include a point in time of the completion of the temporarily freezing or releasing the freeze of the operations.

Growing community of inventors

Beijing, China

Shaorong Li