32 results about "Device mapper" patented technology

The invention provides a cache system based on a nonvolatile memory and a software RAID. The cache system is characterized in that the cache system is a novel storage system architecture by fusing a nonvolatile memory Apache Pass, a software RAID, and a Device Mapper driving module Buaacache. According to the invention, the software RAID is managed by means of the Device Mapper mechanism of the Linux, a high-speed device Apache Pass serves as the Cache of a low-speed RAID, and therefore a two-stage cache system is constructed. The Persistent Memory is characterized in that after the Persistent Memory is powered off, medium data is not lost, and the read-write performance is excellent. According to the invention, the Persistent Memory is selected as the cache of the software RAID, under the condition that the cost is far lower than that of a hardware RAID, the read-write performance of the software RAID approaches even exceeds the hardware RAID.

The invention relates to a nonvolatile cache mechanism facing SSD. The method comprises following steps: a SSD is divided into a large buffer area; small random write requests are first written in small RAM buffer; after the RAM buffer is full, those write requests are written together in the form of log into a buffer area sequentially; then data in the buffer area is written back to a data area by a backstage; in this way, the random write-in performance of SSD is effectively increased; the cache mechanism can also optimize read interference problems; the cache mechanism comprises: sequential and large I / O are filtered by an I / O detection algorithm; cache write can also be sequentially written in a data area by a garbage recovery strategy facing data area, at the same time, remaining data in the buffer area can also be written again in the cache sequentially; a read cache strategy is provided for solving the problem of SSD read interference; A SSD cache SSD system of a log structure based on device mapper is fulfilled.

A method of multi-path accessing a remote logic device under a Linux system is used to realize a multi-path access between an initiator and a target in a storage area network (SAN). Firstly, a communication is established between the initiator and the target. Next, the initiator requests to establish at least one link session with the target. Then, the initiator obtains an iSCSI-connected host assigned by the target, and also obtains a message about connected devices corresponding to the iSCSI-connected host through transmitting a report logic unit number (LUN) command. Then, the initiator configures a device mapper, and the device mapper generates information about redundant devices according to the connected devices and the corresponding LUNs, and the redundant connected devices are mapped into a unique mapping device.

Provided is a method for recovering disk power down based on a novel nonvolatile storage. According to the method, a Linux Kernel Device Mapper frame is adopted, an AEP is adopted in cache equipment in the bottom layer, open source software dm-cache is adopted as a chief source, on the basis of achieving disk cache basic functions, a power down recovering module is added, a byte writing method is adopted to timely write metadata of a cache equipment control structure and a cache block back to a cache control block and a metadata area of the AEP so as to retain in real time an operational scene of the cache module. When power down occurs in a system accidentally and the system is restarted, the operational scene of the cache module can be recovered through the method of reloading a total control data structure which is stored in the cache equipment in the cache control block of the AEP and the metadata information of the cache block in the metadata area of the AEP so as to make the system operate at a sate before the power down, and in this way, the purpose of recovering the data in the disk cache block is achieved.

The invention provides a method for optimizing the performance of an encryption card based on DEVICE MAPPER. The API of the encryption card is integrated into the universal block device kernel framework Device Mapper so that a dm-crypt encryption block device module suitable for the encryption card can be realized, and furthermore, an encrypted file system can be established for protecting confidential data at a disk storage level; the encryption block device module comprises two modes, namely synchronous block encryption and asynchronous block encryption of the domestic encryption algorithm sm1, and a method for registering the algorithm sm1 to a kernel password manager is provided. Compared with the prior art, the method for optimizing the performance of the encryption card based on DEVICE MAPPER is characterized in that the increase of the speed is realized by virtue of parallel operating of a plurality of cards, and in the aspect of system resource utilization rate, principally, the previous encryption card working pattern is changed from waiting mode into an asynchronous working mode, and therefore, the time of the cpu is greatly saved.

A method for extending UEFI firmware to support startup of a drive of an external device is provided. The method comprises the following steps: responding to loading of a target operating system, andoperating extended UEFI firmware; T; the peripheral equipment support module is guided to support the drive of the startup type external equipment, wherein the drive cannot be directly driven by the UEFI firmware; w; wherein the peripheral equipment support module is obtained by modifying a Linux-based micro operating system, and the Linux-based micro operating system is different from a target operating system to be loaded by extended UEFI firmware; A; and loading, by the peripheral device support module, a target operating system after the boot-up-type external device is driven, t, the peripheral device support module being obtained by: starting key ec and device mapper characteristics in a Linux-based micro operating system, and starting the boot-up-type external device by the peripheral device support module, T, the method comprises the following steps: introducing a udev component and a peer component into a Linux-based miniature operation system, t, the peer component being a starter using a Linux key mechanism; A; and adding a driver required for starting the class external equipment into the Linux-based micro operating system.

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 present invention proposes a cache system based on non-volatile memory and software RAID, which is characterized by a novel storage system architecture integrating non-volatile memory Apache Pass, software RAID and Device Mapper driver module Buaacache. The invention utilizes the Device Mapper mechanism of Linux to manage the software RAID, and uses the high-speed device Apache Pass as the Cache of the low-speed RAID, thereby constructing a two-level cache system. Persistent Memory has the characteristics of no loss of media data after power failure and excellent read and write performance. The present invention selects Persistent Memory as the high-speed cache of the software RAID, and realizes that the reading and writing performance of the software RAID is close to or even exceeds that of the hardware RAID under the condition that the cost is far lower than that of the hardware RAID.

The invention relates to a nonvolatile cache mechanism facing SSD. The method comprises following steps: a SSD is divided into a large buffer area; small random write requests are first written in small RAM buffer; after the RAM buffer is full, those write requests are written together in the form of log into a buffer area sequentially; then data in the buffer area is written back to a data area by a backstage; in this way, the random write-in performance of SSD is effectively increased; the cache mechanism can also optimize read interference problems; the cache mechanism comprises: sequential and large I / O are filtered by an I / O detection algorithm; cache write can also be sequentially written in a data area by a garbage recovery strategy facing data area, at the same time, remaining data in the buffer area can also be written again in the cache sequentially; a read cache strategy is provided for solving the problem of SSD read interference; A SSD cache SSD system of a log structure based on device mapper is fulfilled.

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 system capable of restoring a file system. The system comprises a file system; a read-write partition which is used for copying the content of the file system and can be usedfor carrying out read-write operation according to the requirements of a user; a storage unit which is used for storing a device mapper software package, wherein the operating system calls a mountinginstruction in the device mapper software package to mount the file system and the readable-writable partition by utilizing a device mapping mechanism to form a file system with the readable-writablepartition, and after the original file system before mounting is damaged under the abnormal power failure or emergency situation, the mounted file system copied in the readable and writable partitionis started.

Provides a method for extending UEFI firmware to support drivers for boot-type external devices. The method includes: in response to loading the target operating system, running extended UEFI firmware; booting the peripheral device support module to support the driver of the boot-type external device that the UEFI firmware cannot directly drive, wherein the peripheral device support module modifies the Linux-based micro operating system, wherein the Linux-based miniature operating system is different from the target operating system to be loaded by the extended UEFI firmware; and after driving the boot-type external device, load the target operating system through the peripheral device support module , wherein the peripheral device support module is obtained through the following steps: enabling kexec and device mapper features in a Linux-based micro-operating system; introducing udev and petitboot components into a Linux-based micro-operating system, wherein the petitboot component It is a launcher using the Linux kexec mechanism; it adds the driver required to start external devices in a Linux-based micro-operating system.

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.

The invention relates to a method for accessing a remote logical unit in a Linux system in a multipath manner. The method is used for realizing multipath access between an initiator and a target in a storage area network (SAN), and comprises the following steps: the initiator establishes on-line communication with the target and requests to establish at least one on-line session with the target; the initiator obtains internet small computer system interface (iSCSI) on-line host allocated by the target and acquires on-line equipment information corresponding to the iSCSI on-line host by returning a logical unit number (LUN) command; and the initiator which is equipped with an equipment mapping instrument generates redundant equipment information according to the on-line equipment and the corresponding LUN, and maps the redundant on-line equipment to be singular mapping equipment.

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.

The invention discloses a method for accelerating random in-out (IO) read-write of a disk. The method is characterized by comprising the steps that a computer operating system application layer performs a data read-write operation and enters a kernel mode through invagination, a virtual file system layer encapsulates data into a BIO which is an interactive data structure between the virtual file system layer and a general block layer, and then the BIO is submitted to a general block layer subsystem; the BIO is cut into the fixed block size and transmitted to a BINLOGDEV module layer at a DEVICE-MAPPER driving layer of the general block layer subsystem, when the BIO enters the BINLOGDEV module layer, whether a caching condition is met or not is checked, that is, whether the initial position of the BIO is aligned or not, whether the length of the BIO is the block length or not, if the condition is met, a step 103 is conducted, and if the condition is not met, a step 106 is conducted. According to the method for accelerating the random in-out (IO) read-write of the disk, on the condition that the random IO is written, the random IO is converted into the sequence IO, the storing velocity is high, and the efficiency is high.