摘要:
A method and apparatus for mirroring data stored in a storage device in a mass storage system by caching mirror coherency synchronization operation requests (break mirror and/or snapshot) from the operating system of a server and rapidly sending an acknowledgement to the server that the mirror operation has been completed. Thereafter, the mass storage system performs the flushing and mirroring processes to establish a mirror of the storage device at a time that is appropriate and convenient for the mass storage system to perform such mirroring. To facilitate such a mirror operation at a later time, the mass storage system may utilize a mirror table containing information concerning the mirror request. This information enables the mass storage system to subsequently flush the cache of data that is pertinent to a time before the mirror request occurred. Consequently, the mirror operation only mirrors data that would have been available for mirroring at the time the mirror request was received from the server. In this manner, the servers are not halted to facilitate mirroring and the mass storage system may mirror the storage device at a convenient time.
摘要:
A fiber channel storage area network (SAN) provides virtualized storage space for a number of servers to a number of virtual disks implemented on various virtual redundant array of inexpensive disks (RAID) devices striped across a plurality of physical disk drives. The SAN includes plural controllers and communication paths to allow for fail-safe and fail-over operation. The plural controllers can be loosely-coupled to provide n-way redundancy and have more than one independent channel for communicating with one another. In the event of a failure involving a controller or controller interface, the virtual disks that are accessed via the affected interfaces are re-mapped to another interface in order to continue to provide high data availability. In particular, those targets, or virtual disks, which are owned by a failed device (e.g., interface or controller) are identified and their ownership information within the SAN configuration tables is revised to reflect one or more alternative devices which act as back-up devices.
摘要:
A fiber channel storage area network (SAN) provides virtualized storage space for a number of servers to a number of virtual disks implemented on various virtual redundant array of inexpensive disks (RAID) devices striped across a plurality of physical disk drives. The SAN includes plural controllers and communication paths to allow for fail-safe and fail-over operation. The plural controllers can be loosely-coupled to provide n-way redundancy and have more than one independent channel for communicating with one another. In the event of a failure involving a controller or controller interface, the virtual disks that are accessed via the affected interfaces are re-mapped to another interface in order to continue to provide high data availability. In particular, deadman timers, heartbeat signals internal to each controller, and heartbeat signals between different controllers are used to detect controllers that are no longer communicating with other controllers in order to identify those controllers which are failing or have failed.
摘要:
A fibre channel storage area network (SAN) provides virtualized storage space for a number of servers to a number of virtual disks implemented on various virtual redundant array of inexpensive disks (RAID) devices striped across a plurality of physical disk drives. The SAN includes plural controllers and communication paths to allow for fail-safe and fail-over operation. The plural controllers can be loosely-coupled to provide n-way redundancy and have more than one independent channel for communicating with one another. In the event of a failure involving a controller or controller interface, the virtual disks that are accessed via the affected interfaces are re-mapped to another interface in order to continue to provide high data availability.
摘要:
A method, apparatus, and program storage devices that can detect failures in data flow in high-availability storage systems is disclosed. The present invention provides a plurality of software layers that are to be executed in a predetermined order. An equation is implemented in each of the plurality of software layers. The equation provides a solution for determining when the plurality of software layers were executed in the predetermined order.
摘要:
A fiber channel storage area network (SAN) provides virtualized storage space for a number of servers to a number of virtual disks implemented on various virtual redundant array of inexpensive disks (RAID) devices striped across a plurality of physical disk drives. The SAN includes plural controllers and communication paths to allow for fail-safe and fail-over operation. The plural controllers can be loosely-coupled to provide n-way redundancy and have more than one independent channel for communicating with one another. In particular, respective portions from each of the back-end physical disk drives within the SAN are used as one of these alternative communication channels to pass messages between controllers. Such an alternative communications channel provides even further redundancy and robustness in the system.
摘要:
Method and apparatus for managing data in a multi-device data storage array. In accordance with various embodiments, a storage array of independent data storage devices are arranged to form a fast pool and a slow pool of said devices. A controller is adapted to migrate a distributed data set stored across a first plurality of said devices in the slow pool to a second plurality of said devices in the fast pool. The migration is carried out responsive to a return on investment (ROI) determination by the controller that an estimated cost of said migration will be outweighed by an overall improved data transfer capacity of the storage array over a predetermined minimum payback period of time. In some embodiments, the fast pool is formed from a plurality of solid-state drives (SSDs) and the slow pool is formed from a plurality of hard disc drives (HDD).
摘要:
Method and apparatus for application profiling in a multi-device data storage array. In accordance with various embodiments, a storage array is formed of independent data storage devices that form a fast pool and a slow pool of said devices, such as solid-state drives (SSDs) and hard disc drives (HDDs). A controller is adapted to migrate a distributed data set stored across a first plurality of the devices in the slow pool to a second plurality of said devices in the fast pool. The controller carries out the migration responsive to a hint that a selected application is about to be executed that utilizes the distributed data set, and responsive to a return on investment (ROI) determination that an estimated cost of said migration will be outweighed by an overall improved data transfer capacity of the storage array over a predetermined minimum payback period of time.
摘要:
A system for backing up data includes a first computer configured to access a first storage device and a second computer configured to access a second storage device. In particular, the first storage device includes data to be backed up and the second storage device includes a snapshot of the data to be backed up. This system also includes a communications pathway between the first and second computers; and a backup application on the second computer which can backup the snapshot in response to a backup request initiated by the first computer.
摘要:
A method, apparatus and program storage device for providing virtual disk service hints based storage. Virtual disk service hints are provided. The virtual disk service hints are analyzed to determine a configuration model to implement. The storage system is then configured according to the configuration model identified using the virtual disk service hint.