Abstract:
Disclosed is a storage system that suppress occurrence of a bottleneck in the storage system, efficiently uses a bandwidth of hardware, and achieves high reliability. A storage system includes a storage apparatus that stores data, a controller that controls data input/output with respect to the storage apparatus, and an interface that couples the storage apparatus and the controller. The storage apparatus has a plurality of physical ports that are coupled to the interface. The controller logically partitions a storage area of the storage apparatus into a plurality of storage areas and provides the plurality of storage areas, or allocates the plurality of physical ports to the logically partitioned storage areas.
Abstract:
Systems, methods, apparatus and software can implement a multipathing driver using dynamically loadable device policy modules that provide device specific functionality for providing at least one of input/output (I/O) operation scheduling, path selection, and I/O operation error analysis. Because the device policy modules include device specific functionality, various different devices from different manufacturers can be more efficiently and robustly supported.
Abstract:
A network storage appliance is disclosed. The appliance includes a chassis enclosing a backplane, and a server enclosed in the chassis and coupled to the backplane. The appliance also includes storage controllers enclosed in the chassis, each coupled to the backplane, which control transfer of data between the server and storage devices coupled to the storage controllers. The storage controllers also control transfer of data between the storage devices and computers networked to the appliance and external to the appliance. The storage controllers and the server comprise a plurality of hot-replaceable blades. Any one of the plurality of blades may be replaced during operation of the appliance without loss of access to the storage devices by the computers. In one embodiment, the server executes storage application software, such as backup software for backing up data on the storage devices, such as to a tape device networked to the server.
Abstract:
A system and method for recovering from logical path failures is set forth. More specifically, when a host detects a logical path failure, the host enters a path discovery mode of operation. If the host continues to detect a logical path failure while operating in the logical path discovery mode of operation, the host removes the logical path from a logical path mask, and the host does not use the removed logical path again. Additionally, the system and method facilitates recovery of the failed logical paths by using a plurality of logical path masks. A first mask is referred to as an intermediate failure logical path mask and a second mask is referred to as a permanent failure logical path mask.
Abstract:
Provided is a computer system including at least one host computer; and at least one storage system, characterized in that: the storage system has a disk drive and a disk controller, and provides a storage area of the disk drive as at least one logical unit; upon detecting a failure in a logical path serving as an access route from the host computer to the logical unit, the host computer specifies logical paths for accessing the same logical unit that is connected to the logical path where the failure is detected; the host computer executes failure detecting processing for the specified logical paths to judge whether the specified logical paths are normal or not; the host computer selects normal logical paths out of the specified logical paths; and the host computer accesses the logical unit via the normal logical paths selected.
Abstract:
The bandwidth of the inter-connection network between the clusters is quite narrower than that of the inter-connection network in the clusters. When the logical allocation technique is simply applied to a cluster storage system, there is created a logical partition associated with two or more clusters. It is not possible to create logical partitions of performance corresponding to resources allocated thereto. In a storage system including a first cluster and a second cluster, when a resource of the storage system is logically subdivided into logical partitions, a resource of the first cluster is allocated to one logical partition. The system may be configured such that the first and second clusters are connected via switches to disk drives. The system may also be configured such that when failure occurs in the first cluster, the second cluster continuously executes processing of the first cluster.
Abstract:
When the boot monitoring unit receives, from a management server, a first boot response for a first boot request from a NIC1 of a managed server, a boot monitoring unit stores a receiving time of the first boot response. When the boot monitoring unit receives a second boot request from a NIC2 of the managed server, and when a predetermined time has not elapsed from the receiving time, the boot monitoring unit determines that the management server is normal, and transmits an NOP program to the managed server. When the predetermined time has elapsed from the receiving time, the boot monitoring unit determines that the management server is stopped, and transmits a recovering program to the managed server.
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:
The present invention uses memory resources effectively and connects each storage device by a plurality of paths in a switchable manner, thus improving reliability and ease of use, by virtualizing external memory resources as internal memory resources. External storage 2 is connected to the main storage 1, and the actual volume 2A is mapped onto the virtual volume 1A. A plurality of paths is connected between the storage 1 and 2. When a failure occurs in a path in use (S3), the path having the next highest priority is selected (S4), and processing is continued using this path (S5).
Abstract:
An apparatus, system, and method are disclosed for selective cross communications between autonomous storage modules. A RAID controller communicates through a first cascading communications loop comprising a first storage module. The first storage module includes a plurality of storage devices and is disposed in an enclosure. The RAID controller also communicates through a second cascading communications loop comprising a second storage module. The second storage module also includes a plurality of storage devices and is disposed in the enclosure. An interface module transmits messages of the first loop through the second storage module. In one embodiment, the RAID controller communicates a cross communications command to the interface module through the second storage module to enable the interface module to transmit the messages of the first loop through the second storage module in response to a failure of the first loop upstream of the first storage module.