Abstract:
A group of data storage units are serially connected in a sequential data communication path to communicate read and write operations to first and second interfaces of each data storage unit in the group. A data management computer device (“filer”) manages read and write operations of the data storage units of the group through an adapter of the filer. Main and redundant primary communication pathway connectors extend from the filer to the interfaces of the data storage unit, thereby establishing redundancy through multiple pathways to communicate the read and write operations to the data storage units of the group. Main and redundant secondary communication pathway connectors extend from partner filers to the groups of data storage units associated with each partner filer, thereby further enhancing redundancy.
Abstract:
A plurality of logical units are set in an information processing device and a storage device and connected by logical paths. The information processing device monitors the path state. When a state change of a path has occurred, the information processing device searches for a normal path connected to the logical unit and decides a logical unit to be an object of the read request. The information processing device issues a data read request to the logical unit decided. Moreover, when a failure has occurred in the path, the information processing device performs an access to the logical unit by utilizing a path other than the path where the failure has occurred and another path sharing a part of the path where the failure has occurred.
Abstract:
Provided is a storage subsystem capable of inhibiting the deterioration in system performance to a minimum while improving reliability and availability. This storage subsystem includes a first controller for controlling multiple drive units connected via multiple first switch devices, and a second controller for controlling the multiple drive units connected via multiple second switch devices associated with the multiple first switch devices. This storage subsystem also includes a connection path that mutually connects the multiple first switch devices and the corresponding multiple second switch devices. When the storage [sub]system detects the occurrence of a failure, it identifies the fault site in the connection path, and changes the connection configuration of the switch device so as to circumvent the fault site.
Abstract:
A controller discriminates the abnormality between a plurality of disk devices and a transmission path in a storage system having controllers for controlling a plurality of disk storage devices. When one controller in pairs of controllers for controlling the plurality of disk storage devices detects an error during an access to a disk drive of interest, a dummy access is made to the disk drive concerned from a controller connected to another transmission path different from the transmission path. Or, an access is made thereto from another initiator of the transmission path, via the transmission path. Then, from the above access result, a suspected fault location is identified.
Abstract:
A blade enclosure is provided which may accommodate a first configuration which includes integrated drive enclosure blades (I-DEBs) or a second configuration which includes I-DEBs and non-integrated or switched DEBs (S-DEBs). Each I-DEB includes a pair of redundant RAID controllers, each having two configurable ports. In the first configuration, all four ports are configured as host adapter (HA) ports through which data is exchanged with server blades. In the second configuration, one port of each RAID controller is configured as an HA port, through which data is exchanged with server blades, and the other port of each RAID controller is configured as a device adapter (DA) port, through which data may be exchanged with the S-DEB. Zones may also be established to separate traffic between the servers and the I-DEB from traffic between the I-DES and the S-DEB.
Abstract:
A storage system includes a route switch, connected to at least two different communication lines different in path between each of switches and the route switch. Upon detecting a fault on a communication line extending to the switch, the route switch converts a destination address of a frame into a modified address in accordance with an address conversion table. The route switch thus controls a frame exchanged between a calculation device and each of the switches.
Abstract:
A network storage system includes a non-volatile memory to store data including a log of received data access requests, and a cluster interconnect adapter through which to send data to a cluster partner. The nonvolatile memory and the cluster interconnect adapter are implemented in a single device connected to an expansion bus in the network storage system. Communication with the nonvolatile memory is carried out using LDMA, and communication with the cluster partner is carried out using RDMA via the cluster interconnect adapter. LDMA and RDMA functionality are merged in a common software stack.
Abstract:
According to an aspect of an embodiment, a storage apparatus comprising; a pair of control devices for controlling storage devices, each control device being connected with another control device; storage devices for storing data; switches being connected with the plurality of storage devices, the switches being connected between the control devices in series; wherein the control device for controlling the plurality of switches according to a process comprising the steps of: detecting a fault in the connection of the switches, and; controlling the control devices to access the storage devices via the switches such that one of the control devices accesses a part of the storage devices via a part of the switches located between said one of the control devices and the fault, and the other of the control devices accesses remainder of the storage devices via remainder of the switches, respectively.
Abstract:
A host and a storage system are connected via at least one intermediate device so as to be able to communicate. The storage system comprises a storage device, which makes it possible to store data. The host recognizes a logical path from this host to the storage device. In this case, a computer, which is able to read in and execute a computer program, carries out processing for specifying a plurality of physical paths, which exist between the host and the storage system; specifying to which physical path of the specified plurality of physical paths the logical path corresponds; and making the logical path correspond to the specified physical path.
Abstract:
Upon receiving a primary/secondary switching command from a secondary host system, a secondary storage control device interrogates a primary storage control device as to whether or not yet to be transferred data that has not been remote copied from the primary storage control device to the secondary storage control device is present. In the event that yet to be transferred data is present, the secondary storage control device receives yet to be transferred data from the primary storage control device and updates a secondary volume. The primary storage control device then manages positions of updates to the primary volume due to host accesses to the primary volume occurring at the time of the secondary storage control device receiving the primary/secondary switching command onwards using a differential bitmap table.