Hitachi, Ltd.

Kunihiko Nashimoto

Hideo Saito

Tomohiro Kawaguchi

Keishi Tamura

Azusa Jin

Noboru Furuumi

Shigeo Homma

Hidenori Suzuki

Hiroshi Nasu

Toru Suzuki

Shoji Sugino

Taiki Kono

Akira Yamamoto

Hirotaka Nakagawa

Naoko Ikegaya

Akihiro Mori

Shinichi Hiramatsu

Nobuhito Mori

Abhishek Johri

Yoichi Goto

Shunji Kawamura

Kenji Muraoka

Shin Nishihara

A source remote copy configuration in a source storage system is migrated to a destination storage system as a destination remote copy configuration. The destination primary storage apparatus of the destination storage system defines a virtual volume mapped to the primary volume provided by the source primary storage apparatus which is a storage area of the virtual volume; takes over a first identifier of the primary volume to the virtual volume; transfers, when the virtual volume receives an access request, the access request to the source primary storage apparatus to write data in the primary volume; and takes over the first identifier from the virtual volume to another primary volume provided by the destination primary storage apparatus, after completion of copy of data from primary volume of the source primary storage apparatus into primary volume of the destination primary storage apparatus and secondary volume of the destination secondary storage apparatus.

Storage apparatus and storage apparatus migration method

A storage system manages control information, which is information related to responses corresponding to prescribed types of commands, for each of a plurality of logical units associated with a logical device, said logical units being provided to one or more host systems. The prescribed types of commands indicating the logical units provided to a first host system, which is one of the one or more host systems, are received from the first host system by the storage system. Responses based on the control information corresponding to the logical units indicated by the received prescribed types of commands are returned to the first host system by the storage system as responses to the received prescribed types of commands.

Computer system and storage control method

A computer system includes a server that issues an access request with a virtual volume among the plurality of virtual volumes allocated in a plurality of storage apparatuses as an access target and measures a latency in each access path connecting each storage apparatus and the server, and a plurality of control units which are disposed in each storage apparatus and control the I/O of data. Among the plurality of control units, a main control unit that controls the migration of a migration source virtual volume selects, as a migration destination storage apparatus, one storage apparatus connected to an access path from which was obtained a second measured value, which is a measured value that is smaller than a first measured value indicating a latency in an access path connecting a migration source storage apparatus, which includes the migration source virtual volume, and the server, and indicates a latency in an access path connecting a storage apparatus, other than the migration source storage apparatus, and the server, and allocates a migration destination virtual volume in the migration destination storage apparatus.

Computer system

An example of the present invention is a storage system comprising a first real storage apparatus including a plurality of real resources. The first real storage apparatus includes: real resource groups allocated to a plurality of virtual storage apparatuses; first management information for associating virtual resource identifiers individually assigned to real resources in a namespace independently defined for each of the plurality of virtual storage apparatuses with real resource identifiers individually assigned to the real resources in a namespace defined for the first real storage apparatus; and a controller for receiving a command including a designation with a virtual resource identifier, converting the virtual resource identifier in the command into a real resource identifier with reference to the first management information, and processing the command with the converted real resource identifier.

Storage system and control method for storage system

For first write request to a virtual volume, the first storage apparatus performs processing by a method of either a first write processing method that stores write data in a first logical volume associated with the virtual volume as well as transfers a first write request, to the second storage apparatus, for storing the write data in a second logical volume associated with the virtual volume of the second storage apparatus or a second write processing method that transfers a first write request, to the second storage apparatus, then selects a processing method according to a first IO load on a first area of the virtual volume of the first storage apparatus and a second IO load on the first area of the virtual volume of the second storage apparatus to perform a processing for the first write request.

Storage system and method of controlling the same

An example is a method of controlling a storage system for providing a virtual storage apparatus that includes virtual storage resources associated with real storage resources of real storage apparatus. It includes receiving a virtual storage resource control command of a predetermined type specifying a first virtual storage resource in the virtual storage apparatus and a second virtual storage resource associated with the first virtual storage resource; referring to management information for managing association relations between the virtual storage resources and the real storage resources, to identify a first real storage resource associated with the first virtual storage resource and a first real storage apparatus including the first real storage resource; and selecting a second real storage resource associated with the second virtual storage resource from real storage resources within the first real storage apparatus, or creating the second real storage resource within the first real storage apparatus.

Virtual storage apparatus providing a plurality of real storage apparatuses

A storage apparatusincludes channel devices (each being CHA_PK) and microprocessors (each being MP_PK). CHA_PKand MP_PKrespectively store therein control information being information designating logical volumes (LDEVs)accessible by respective MP_PKs. Upon receipt of an I/O request from a management apparatus, CHA_PKtransmits, based on the control information stored therein, an I/O command to MP_PKhaving an access right to a logical volume to which the I/O request is directed. In the storage apparatus, MP_PKhaving received the I/O command from CHA_PKjudges based on the control information stored therein whether MP_PKitself has an access right to the logical volume, and transmits the control information therein to CHA_PKwhen judging that it does not have the access right, whereby the control information in CHA_PKis updated.

Storage apparatus and method of updating control information in storage apparatus

A virtualization method for a storage system recognizes one or more logical devices located in a first and second storage apparatus and defined in a host apparatus as being connected to a channel, based on an inquiry command sent from the host apparatus when the channel comes on-line; detects one or more logical devices among the one or more logical devices defined in the host apparatus as being connected to the channel and located in the first and second storage apparatus, based on the recognition result; sets, based on the detection result, one or more virtual volumes in the first storage apparatus, respectively corresponding to the one or more logical devices in the second storage apparatus; and sets a first logical path between each of the set one or more virtual volumes and each of the corresponding one or more logical devices in the second storage apparatus.

Virtualization method and storage apparatus for a storage system having external connectivity

The present invention provides a storage control subsystem that facilitates logical volume access management by a host. Before copying, the host instructs a disk array device to identify the states of target logical volumes and collect information in control memory, whereupon the disk array device reads information in the control memory and reports information relating to the target logical volumes to the host.

Growing community of inventors

Tokyo, Japan

Kunihiko Nashimoto