Abstract: A method for data storage includes, in a system that includes multiple servers, multiple multi-queue storage devices and at least one storage controller that communicate over a network, storing data blocks by the servers on the storage devices. A shared data structure, which is accessible to the servers using remote direct memory access and which maps hash values calculated over the data blocks to respective storage locations of the data blocks on the storage devices, is maintained. The data blocks stored on the storage device are deduplicated, by looking-up the shared data structure by the servers without executing code on a processor of the storage controller.

Abstract: A method for data storage includes, in a system that includes multiple servers, multiple multi-queue storage devices and at least one storage controller that communicate over a network, storing data by the servers in a storage process that (i) caches the data in a cache memory that is accessible to the servers and to the storage devices and (ii) de-stages the cached data from the cache memory to the storage devices. A progress of the storage process is continually journaled, by the servers, in a plurality of server-specific journals residing in the cache memory. In response to a failure occurring during the storage process, the data is recovered by the storage controller based on the server-specific journals.

Abstract: A method for data storage includes, in a system that includes multiple servers, multiple multi-queue storage devices and at least one storage controller that communicate over a network, storing data by the servers in a storage process that (i) caches the data in a cache memory that is accessible to the servers and to the storage devices and (ii) de-stages the cached data from the cache memory to the storage devices. A progress of the storage process is continually journaled, by the servers, in a plurality of server-specific journals residing in the cache memory. In response to a failure occurring during the storage process, the data is recovered by the storage controller based on the server-specific journals.

Abstract: A method for data storage includes, in a system that includes multiple servers, multiple multi-queue storage devices and at least one storage controller that communicate over a network, storing data by the servers in a storage process that (i) caches the data in a cache memory that is accessible to the servers and to the storage devices and (ii) de-stages the cached data from the cache memory to the storage devices. A progress of the storage process is continually journaled, by the servers, in a plurality of server-specific journals residing in the cache memory. In response to a failure occurring during the storage process, the data is recovered by the storage controller based on the server-specific journals.

Abstract: A method for data storage includes, in a system that includes multiple servers, multiple multi-queue storage devices and at least one storage controller that communicate over a network, storing data by the servers in a storage process that (i) caches the data in a cache memory that is accessible to the servers and to the storage devices and (ii) de-stages the cached data from the cache memory to the storage devices. A progress of the storage process is continually journaled, by the servers, in a plurality of server-specific journals residing in the cache memory. In response to a failure occurring during the storage process, the data is recovered by the storage controller based on the server-specific journals.

Abstract: A system for data storage includes multiple servers, which are configured to communicate over a network with multiple multi-queue storage devices and with at least one storage controller, to store on the storage devices compressed data belonging to a user volume, to specify storage locations, in which the compressed data is stored on the storage devices, in a shared data structure that is shared and modified by the servers using remote direct memory access, and to coordinate access to the compressed data by the servers by querying the shared data structure, without executing code on a processor of the storage controller.

Abstract: Storing computer data is provided. Responsive to determining that a first data includes user data, storing the user data to a first storage system, wherein the first storage system provides a first quality of service. Responsive to determining that a second data includes redundant data, storing the redundant data to a second storage system, wherein the second storage system provides a second quality of service that is lower than the first quality of service provided by the first storage system.

Abstract: A system for data storage includes multiple servers, which are configured to communicate over a network with multiple multi-queue storage devices and with at least one storage controller, to store on the storage devices compressed data belonging to a user volume, to specify storage locations, in which the compressed data is stored on the storage devices, in a shared data structure that is shared and modified by the servers using remote direct memory access, and to coordinate access to the compressed data by the servers by querying the shared data structure, without executing code on a processor of the storage controller.

Abstract: A system for data storage includes multiple servers, which are configured to communicate over a network with multiple multi-queue storage devices and with at least one storage controller, to store on the storage devices compressed data belonging to a user volume, to specify storage locations, in which the compressed data is stored on the storage devices, in a shared data structure that is shared and modified by the servers using remote direct memory access, and to coordinate access to the compressed data by the servers by querying the shared data structure, without executing code on a processor of the storage controller.

Abstract: A method for data storage includes, in a system that includes multiple servers, multiple multi-queue storage devices and at least one storage controller that communicate over a network, storing data blocks by the servers on the storage devices. A shared data structure, which is accessible to the servers using remote direct memory access and which maps hash values calculated over the data blocks to respective storage locations of the data blocks on the storage devices, is maintained. The data blocks stored on the storage device are deduplicated, by looking-up the shared data structure by the servers without executing code on a processor of the storage controller.

Abstract: A system for data storage includes multiple servers, which are configured to communicate over a network with multiple multi-queue storage devices and with at least one storage controller, to store on the storage devices compressed data belonging to a user volume, to specify storage locations, in which the compressed data is stored on the storage devices, in a shared data structure that is shared and modified by the servers using remote direct memory access, and to coordinate access to the compressed data by the servers by querying the shared data structure, without executing code on a processor of the storage controller.

Abstract: Methods, computing systems and computer program products implement embodiments of the present invention that include configuring a mapping table to store mappings between logical and physical storage regions on one or more storage devices, and configuring recent and stable lists to store physical region numbers for non-mapped physical storage regions. A request is received to delete, from the mapping table, a given mapping including a given physical storage region, and the metadata indicating the given physical storage region is stored to a recent list stored in the memory. When the mapping table is destaged from the memory to a given storage device, the metadata is moved from the recent list to a stable list stored in the memory. Upon receiving a mapping request, a physical storage region is allocated from the stable list. If the recent list is empty, then the physical storage region is allocated from the recent list.

Abstract: Storing computer data is provided. Responsive to determining that a first data includes user data, storing the user data to a first storage system, wherein the first storage system provides a first quality of service. Responsive to determining that a second data includes redundant data, storing the redundant data to a second storage system, wherein the second storage system provides a second quality of service that is lower than the first quality of service provided by the first storage system.

Abstract: Methods, computing systems and computer program products implement embodiments of the present invention that include configuring a mapping table to store mappings between logical and physical storage regions on one or more storage devices, and configuring recent and stable lists to store physical region numbers for non-mapped physical storage regions. A request is received to delete, from the mapping table, a given mapping including a given physical storage region, and the metadata indicating the given physical storage region is stored to a recent list stored in the memory. When the mapping table is destaged from the memory to a given storage device, the metadata is moved from the recent list to a stable list stored in the memory. Upon receiving a mapping request, a physical storage region is allocated from the stable list. If the recent list is empty, then the physical storage region is allocated from the recent list.