Abstract:
A data storage network is provided. The network includes a client connected to the data storage network; a plurality nodes on the data storage network, wherein each data node has two or more RAID controllers, wherein a first RAID controller of a first node is configured to receive a data storage request from the client and to generate RAID parity data on a data set received from the client, and to store all of the generated RAID parity data on a single node of the plurality of nodes.
Abstract:
A high-availability storage system includes a first storage system and a second storage system. The first storage system includes a first Central Processing Unit (CPU), a first physically-addressed solid state disk (SSD) and a first non-volatile memory module that is coupled to the first CPU. Similarly, the second storage system includes a second CPU and a second SSD. Upon failure of one of the first or second CPUs, or the storage system with the non-failing CPU continues to be operational and the storage system with the failed CPU is deemed inoperational and the first and second SSDs remain accessible.
Abstract:
A relay device includes a processor that executes a procedure. The procedure includes detecting a change in a first communication state between a local device and a first relay device that is arranged in a stage preceding or succeeding the local device and connected to the local device with a logical path, obtaining, from a second relay device for relaying a logical path different from the logical path relayed by the local device, a second communication state between the second relay device and a third relay device that is arranged in a stage preceding or succeeding the second relay device and connected to the second relay device with a logical path, and enabling a logical path between the local device and the second relay device according to a combination of the first and the second communication states when the change in the first communication state is detected.
Abstract:
Since the whole storage device is blocked according to the conventional data saving method when failure occurs to the storage device in a storage subsystem, so that when failure occurs to two storage devices at the same time within a same RAID group, double failure is caused and data loss occurs. In order to solve the problem, the present invention divides a storage device into storage areas of predetermined units, constructs RAID groups from two or more storage areas, and when failure occurs to the storage area, selects a data migration destination storage area from either the RAID group in which failure has occurred or the RAID group other than the RAID group in which failure has occurred, migrates the data stored in the storage area where failure has occurred to the selected data migration destination storage area, and blocks only the storage area where failure has occurred.
Abstract:
Included within a shared housing are at least one user interface element; a first isolated computational entity; a second isolated computational entity; and a switching arrangement. The switching arrangement is configured to, in a first mode, connect the first isolated computational entity to the at least one user interface element; and, in a second mode, connect the second isolated computational entity to the at least one user interface element.
Abstract:
A data storage system includes a data storage module having at least a first I/O port and a second I/O port, a first controller module directly connected to the first I/O port, and a second controller module directly connected to the second I/O port. The second controller module is also in communication with the first controller module via a communication link, wherein the first and second controller modules are redundant controllers for the data storage module, and wherein, when the data storage module is controlled by the first controller module, the first controller module writes data to, or reads data from, the data storage module via a direct path to the first I/O port, and writes data to, or reads data from, the data storage module via an indirect path through the communication link and the second controller module to the second I/O port.
Abstract:
A method for backing up data of a storage system, where at least two mirroring channels are provided between a first mainboard and a second mainboard of a storage system, and the method includes: transmitting data through at least one effective mirroring channel if all the mirroring channels are effective; and transmitting the data through remaining mirroring channel(s) if at least one of the mirroring channels for transmitting the data fails. The method enables traffic to be transmitted evenly on normal mirroring channels, and ensures maximized utilization of the bandwidth of mirroring channels.
Abstract:
A data processing system includes a first storage system that is connected to a host device and sends and receives data to and from the host device; a second storage system that is connected to the first storage system and receives data from the first storage system; and a third storage system that is connected to the first storage system and receives data from the first storage system. The first storage system, the second storage system and the third storage system are arranged to be changeable between a first status including first and second copy pairs and a second status including a third copy pair in response to a predetermined condition at the first storage system.
Abstract:
Method and system for managing error related events while a system is processing input/output (“I/O”) requests for accessing storage space is provided. Various components are involved in processing the I/O requests. Some of these components may also have sub-components. Events related to the various components are classified with respect to their severity levels. Threshold values for a frequency of these events is set and stored in a data structure at a memory location. When an event occurs, the severity level and the threshold value for the event are determined from the data structure. The actual frequency is then compared to the stored threshold value. If the threshold value is violated and there is an alternate path to route the I/O request, then the affected component is restricted and the alternate path is used to route the I/O request.
Abstract:
Each communication path between controllers and a plurality of storage devices has a plurality of expanders coupled in series. In order to shorten the time during which the communication path is not used for I/O, either (A) the length of time for which I/O suppression is set for the communication path is shortened, or (B) the overall time it takes for processing other than I/O processing is shortened. In the (A), a determination as to whether or not the coupling between the expanders has been disconnected is made for the I/O-suppressed communication path, and in a case where the result of this determination is negative, a discover process is carried out after releasing the I/O suppression with respect to this communication path. In the (B), the number of command issue times of updating routing control information of the expander is reduced.