摘要:
Deadlock is avoided in a grid storage system having superior scalability. Provided is a storage subsystem connected to a host computer for receiving a write or read access from the host computer. This storage subsystem includes a plurality of modules respectively having a storage resource, a switch for connecting the plurality of modules, a controller for controlling the transfer of a packet based on the write or read access from the host computer to a target module among the plurality of modules via the switch, and a memory storing a transfer rule of the packet. The controller controls the transfer of the packet based on the transfer rule.
摘要:
To provide a storage system with a cost/performance meeting the system scale, from a small-scale to a large-scale configuration. In the storage system, protocol transformation units and data caching control units are connected to each other through an interconnection, the data caching control units are divided into plural control clusters, each of the control clusters including at least two or more data caching control units, control of a cache memory is conducted independently for each of the control clusters, and one of the plural data caching control units manages, as a single system, protocol transformation units and the plural control clusters based on management information stored in a system management information memory unit.
摘要:
To provide a storage system with a cost/performance meeting the system scale, from a small-scale to a large-scale configuration. In the storage system, protocol transformation units and data caching control units are connected to each other through an interconnection, the data caching control units are divided into plural control clusters, each of the control clusters including at least two or more data caching control units, control of a cache memory is conducted independently for each of the control clusters, and one of the plural data caching control units manages, as a single system, protocol transformation units and the plural control clusters based on management information stored in a system management information memory unit.
摘要:
To provide a storage system with a cost/performance meeting the system scale, from a small-scale to a large-scale configuration. In the storage system, protocol transformation units and data caching control units are connected to each other through an interconnection, the data caching control units are divided into plural control clusters, each of the control clusters including at least two or more data caching control units, control of a cache memory is conducted independently for each of the control clusters, and one of the plural data caching control units manages, as a single system, protocol transformation units and the plural control clusters based on management information stored in a system management information memory unit.
摘要:
The storage system is configured to expand from small to large configurations at a reasonable cost with performance decided approximately to a target system scale. The storage system has a plurality of protocol transformation units, each used for transforming a protocol to be exchanged with the server or disk drives, and a plurality of data caching control units, each having a cache memory unit for storing data and a function for controlling the cache memory unit. The plurality of data cashing control units are divided into a plurality of control clusters while the cache memory unit is controlled only in its corresponding control cluster independently and the system management unit is connected to an interconnection, such that the system management unit manages the plurality of protocol transformation units and the plurality of control clusters are managed integrally as one system.
摘要:
A cache access control system for dynamically conducting specification of dedicated and common regions and thereby always conducting optimum cache coherency control. In a processor, an L1 cache including an L1 data array and a directory is provided. A plurality of L2 caches are connected to each L1 cache. The L2 caches are connected to a main memory L3. An L2 cache history manager is supplied with L2 cache status information and an L2 cache access request from L2 caches. The L2 cache history manager judges an attribute (a dedicated region or a common region) of each line of L2. On the basis of the attribute, a cache coherency manager conducts coherency control of each L2 cache by using an invalidation type protocol or an update type protocol. The attribute is judged to be the common region, only in the case where a line shared by a plurality of L2 caches in the past is canceled once by the invalidation type protocol and then accessed again.
摘要:
A storage controller of the present invention narrows down the target for data comparison by comparing hash codes beforehand and rapidly detects duplicated data. A hash value setting unit sets a hash code in data received from a host. Hash code-attached data is stored in a logical volume. A microprocessor unit compares the hash codes for each comparison-targeted data. When hash codes match with one another, a data comparator compares the target data, and determines whether or not the data is duplicated data. When duplicated data is detected, the microprocessor unit removes the duplicated data.
摘要:
Provided are a storage controller and storage control method capable of improving the transaction performance. This storage controller includes a disk controller for receiving a read command and a write command from a host computer, and an external disk controller and an internal disk device for sending and receiving data to and from the disk controller. A storage device of the external disk controller or the internal disk controller processes the access from the disk controller in physical sub-block units. When the disk controller is to access the storage device of the external disk controller or the internal disk device in logical sub-block units in which an additional code containing a guarantee code is added to user data, it makes such access in minimum common multiple units of logical sub-blocks and physical sub-blocks, and changes the guarantee code length.
摘要:
Provided is a storage system. The storage system includes: a hard disk drive, and a storage controller for reading/writing data from/to the hard disk drive, the storage controller including: at least one interface connected to a host computer through a network; and a plurality of processors connected to the interface through an internal network. The storage system is characterized in that: the processor provides at least one logical access port to the host computer; and the interface stores routing information including a processor which processes an access request addressed to the logical access port, extracts an address from the received access request upon reception of the access request from the host computer, specifies the processor which processes the received access request based on the routing information and the extracted address, and transfers the received access request to the specified processor.
摘要:
A disk controller has a channel adapter having a connection interface to a host computer or a disk drive; a memory adapter for temporarily storing data to be transferred between the host computer and disk drive; a processor adapter for controlling operations of the channel adapter and memory adapter; and a switch adapter for configuring an inner network by interconnecting the channel adapter, memory adapter and processor adapter, wherein the channel adapter, memory adapter, processor adapter and switch adapter each include a DMA controller for performing a communication protocol control of the inner network; and packet multiplex communication is performed among the DMA controllers provided in the adapters. The disk controller can realize a high transfer efficiency and a low cost while retaining a high reliability. A storage system includes an interface unit having an interface with a server or hard drives, a memory unit, a processor unit, and an interconnection.