Nec Corporation

Takuya Saegusa

Kazuya Honma

A disk array apparatus and an interrupt execution method of the same enables command processing received from an upper level apparatus to be executed in high-speed by reducing rate of the interrupt and substantial processing speed not to decrease even when a write command from the upper level apparatus is continuously executed. A configuration is capable of executing selectively either an immediate interrupt or a delay interrupt. Selection is made to execute the immediate interrupt in the case of a write command while in the case of a read-out command, the delay interrupt is selected. Moreover, Judgment whether or not competition of page occurs when the write command is detected, namely whether or not a region of a cache memory that becomes execution object of the command is used is performed. Only when competition of the page occurs, handling is switched from general delay interrupt to an immediate interrupt. It is possible to reduce waiting time caused by competition of the page while immediately releasing the region of the cache memory that becomes execution object of the command.

Disk array apparatus and interrupt execution method of the same

Fiber channel connection magnetic disk device and controller which have a plurality of fiber-channel specification supporting port controllers, comprising: a port controller for managing the relationship between an identifier allocated to each host and a logical volume accessible from the host having the identifier; and a local access right management table memory for storing the management state of a logical volume accessible from an indicated host, the port controller being capable of rejecting an access from hosts other than the indicated host.

Fiber channel connection magnetic disk device and fiber channel connection magnetic disk controller

A system and method of detecting/eliminating a faulty port in a fiber channel-arbitrated loop, which implements early location/elimination of a port which causes a faulty on a loop in an FC-AL. If no faulty is found in loop at step it can be determined that its own port normally works. Then, an enable instruction is issued to a node destined to a port on the loop from loop at step If a fault is detected in the loop at step it can be determined that the port which has issued the enable instruction at step has been issued faulty. The port which has issued the enable instruction at step is registered as a faulty port at step A bypass instruction is issued from the loop at step

System and process for detecting/eliminating faulty port in fiber channel-arbitrated loop

A multi-array disk apparatus includes first and second logical drives, a first array controller, a second array controller, and interface control circuits. Each of the first and second logical drives has two logical structure disks constituting a pair. The first array controller controls the first logical drive. The second array controller controls the second logical drive. When a fault occurs in the other of the first and second array controllers, the interface control circuits bus-connect one of the first and second array controller in which no fault occurs to the logical structure disk connected to the other of the first and second array controller in which the fault occurs.

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Tokyo, Japan

Takuya Saegusa