32 results about "Device mapper" patented technology

The container image layered encrypted storage method based on Device Mapper of the present invention mainly adopts dm-crypt to encrypt specific snapshot devices. A mirror layer corresponds to a logical device under Device Mapper, and the logical device is encrypted by the dm-crypt module using the key of the current mirror layer. When you need to use the mirror layer, use the mirror layer key to decrypt and open the previously encrypted device through the dm-crypt module. The decrypted and opened device is an accessible device, which is provided to the user after being bound to the file system. The present invention improves the existing container image storage mechanism, proposes a security mechanism for image layered encryption storage, realizes the security isolation of container image layer data, not only realizes the storage security of the container, but also realizes the storage of the container through layered encryption Access control. It is convenient for security managers to provide application services to users with different permissions according to different needs, so that the application security of containers is significantly improved.

The invention provides an RS (Reed-Solomon)-DRAID (D redundant array of independent array) system based on GPUs (graphic processing units) and a method for controlling data of memory devices. The RS-DRAID system comprises a plurality of device mappers, a plurality of servers and a plurality of memory devices. The servers are used for receiving writing IO (input and output) requests, each writing IO requests into a plurality of chunks which are synchronously transmitted, the servers are used for controlling writing into the memory devices and restoring failure memory devices, each server comprises an internal memory unit and a check code computing unit, the check code computing units are used for parallelly computing check codes according to the chunks from the device mappers, the check codes are recomputed when the memory devices are failure, the recomputed check codes are written into the internal memory units to recover the failure memory devices, the check code computing units are the graphic processing units GPU, and a central processing unit CPU is used for controlling data written into the memory devices. RS-DRAID algorithm is realized in a server cluster, the GPUs realize a check code parallel computing process, and service rate of the memory devices can be improved.

The invention provides a pseudo-random type network file system (NFS) application acceleration system. The pseudo-random type NFS application acceleration system comprises two kernel modules, namely prefetch network file systemdaemon (pfnfsd) and device mapper cache (dmcache); pfnfsd is a rewrite of the kernel module nfsd, mainly comprises an NFS client request positioning module and a pre-acquiring module, and is used for capturing and positioning an NFS request of a client and executing pre-acquiring operation; and dmcache is a target driver realized on the basis of a linux kernel device mapper mechanism, mainly comprises a module for managing high-speed storage equipment, mapping an address and recycling resources, and is used for storing the pre-acquired data to the high-performance storage equipment. In the pseudo-random type NFS application acceleration system, the application is transparent, the kernel changes small and the extra high-speed storage equipment can be loaded.

Embodiments relate to non-disruptive modification of a device mapper stack. Aspects include receiving the device mapper stack comprising a first device mapper layer having an active mapping table and creating a second device mapper layer having a copy of the active mapping table from the first device mapper layer. Aspects further include creating an inactive mapping table having a desired mapping logic in the first device mapper layer and suspending and resuming an operation of the first device mapper layer. Suspending and resuming causes the active mapping table of the first device mapper layer to be replaced with the inactive mapping table of the first device mapper layer.