33 results about "Sparse file" patented technology

Read-only and read-write snapshot copies of a production file in a Unix-based file system are organized as a version set of file inodes and shared file blocks. Version pointers and branch pointers link the inodes. Initially the production file can have all its blocks preallocated or it can be a sparse file having only an inode and its last data block. A protocol is provided for creating read-only and read-write snapshots, deleting snapshots, restoring the production file with a specified snapshot, refreshing a specified snapshot, and naming the snapshots. Block pointers are marked with a flag indicating whether or not the pointed-to block is owned by the parent inode. A non-owner marking is inherited by all of the block's descendants. The block ownership controls the copying of indirect blocks when writing to the production file, and also controls deallocation and passing of blocks when deleting a read-only snapshot.

A method for performing efficient caching of sparse files in a distributed cache by use of an enumeration process is provided. According to the disclosed invention, the storage's objects are cached in the order that these objects are kept in the storage's directory. As a result, the directory content is enumerated in the cache, resulting in the cache not having to be associated with the server layout.

Techniques are provided for using a sparse file to create a hot archive of a pluggable database of a container database. In an embodiment and while a source pluggable database is in service, a source database server creates a clone of the source pluggable database. Also while the source pluggable database is in service, the source database server creates an archive of the source pluggable database that is based on the clone. Eventually, a need arises to consume the archive. A target database server (which may also be the source database server) creates a target pluggable database based on the archive.

The invention provides a method and a device for quickly verifying the consistency of multi-duplicate storage. The method includes S1, judging data writing volumes of head files when systems are in idle states, creating snapshot files by the aid of I/O (input/output) redirection technologies when the volumes of data written into the head files reach 30% of the volumes of integral spare files at least, utilizing new head files with continuously written data as null comparison sparse files, computing hash values of the snapshot files and storing the hash values of the snapshot files as extended attributes; S2, carrying out snapshot operation on the head files once at intervals of preset time and comparing hash values of the new head files to the hash values of the snapshot files when the consistency of multi-duplicate data need to be timely verified. The method and the device have the advantages that characteristics of distributed block storage are combined with one another, the method for quickly detecting the consistency of multiple duplicates on the basis of snapshot technologies is proposed, hash value computation tasks are divided to be carried out in multiple time slots, accordingly, influence on normal reading and writing tasks of the systems can be prevented, and the multi-duplicate storage consistency verification speeds can be increased.

In at least one embodiment of the invention, a primary storage facility is managed in an HSM system. Data is relocated from the primary storage facility to a secondary storage facility. A request is received from a client for only a portion of the relocated data. In response to the request, the requested portion of the data is obtained from the secondary storage facility and stored in the primary storage facility as a sparse file. The requested portion of the data is then provided to the client from the sparse file.

The invention discloses a cross-platform virtual machine live migration method and device, equipment and a medium. The method comprises the following steps: creating a shadow virtual machine on a target platform based on configuration information of a source virtual machine on a source platform; determining a target virtual machine on a target platform based on configuration information of the shadow virtual machine, wherein the configuration information of the shadow virtual machine is carried in a sparse file; and migrating to-be-migrated data of the source virtual machine to the target virtual machine, wherein the to-be-migrated data comprises the configuration information of the shadow virtual machine. According to the cross-platform virtual machine thermal migration method and device, the equipment and the medium provided by the embodiment of the invention, the thermal migration rate of the virtual machine can be improved.

The invention relates to a method for redirecting read-write data of an iSCSI (Internet Small Computer System Interface) mounting volume and a backup and recovery system thereof. The method comprises the following steps: (1) creating a temporary sparse file with the same size as an original sparse file; (2) when write operation of the original sparse file is captured, directly writing the data into the temporary sparse file in the step (1); (3) when read operation of the original sparse file is captured, reading the data from the original sparse file and merging data changed read from the temporary sparse file to obtain a newest data block. The backup and recovery system comprises a storage module and an SCSI protocol analysis module of a native file system. Compared with the prior art, the read-write performance of the mounting volume is improved, so that the storage performance required by application on a production system can be met well, and the availability of the iSCSI mounting volume is improved.

The invention discloses a device and method for compressing a file outgoing packet, and the device comprises a packaging module and a viewing module, and the packaging module is provided with an adjustment unit, a compression model creation unit, and a compression unit; the viewing module is provided with a decompression unit. The method for compressing the file outgoing packet comprises an outgoing packet packaging process and an outgoing packet viewing process. The package outgoing process comprises the steps of firstly creating a virtual volume, then mounting the virtual volume and writingthe virtual volume into a file to generate a virtual volume mounting file, compressing the virtual volume mounting file into a compressed file through a compressed sparse file algorithm, and then outgoing a compressed file outgoing package. The outgoing package viewing process includes that the compressed file is extracted, then the compressed file is decompressed through a decompression algorithm, the decompressed file is mounted to generate a sparse file, the file of the outgoing package is viewed. The problem that the outgoing package file is large in size and not easy to carry is solved.

The invention provides a distributed storage file recovery method, which is applied to a hyper-fusion system, and comprises the following steps: when detecting that at least one target file is deleted, creating a multi-level chain-based blindage file; the blindage file is a sparse file generated by performing zero-write filling on a storage cell where each data block of the target file is located; storing a deletion log of the target file; the deletion log comprises a file path and position information of a target file; the file path comprises a directory where the target file is located and a file name; the position information comprises a unique number of a storage unit where each data block of the target file is located, the number of layers where the built shelter file is located and a unique number of a storage cell where the built shelter file is located; and recovering the target file according to the deletion log. By adopting the method, the problem that the computer performance is reduced due to independent detection of massive files can be avoided.

An embodiment may involve persistent storage including a parent filesystem and a pre-configured amount of free space within the parent filesystem that is dedicated for shared use. The embodiment may also involve one or more processors configured to, for each of a plurality of child filesystems: create a sparse file with an apparent size equivalent to the pre-configured amount of free space; create a virtual mapped device associated with the sparse file; establish one or more cryptographic keys for the virtual mapped device; create an encrypted virtual filesystem for the virtual mapped device and within the sparse file, wherein the encrypted virtual filesystem uses the cryptographic keys for application-transparent encryption and decryption of data stored by way of the encrypted virtual filesystem; and mount the encrypted virtual filesystem within the parent filesystem as one of the child filesystems.

In some embodiments, a cyber security method for preventing unauthorized file modification by malicious software and the like, the file accessible to an authorized handler may include: receiving a first access request from a program, the first access request having a first instruction set for modifying data of the file; determining if the file is associated with the authorized handler; processing the first instruction set to produce first modification data; and generating an initial virtual file object comprising the first modification data. In further embodiments, a cyber security method for preventing unauthorized file modification by malicious software and the like, the file accessible to an authorized handler may include: processing an instruction set for modifying a file to produce modification data; generating a virtual file object comprising the modification data; and associating the virtual file object with the file by identifying the file as a sparse file.