Emc Corporation

Sharon Galtzur

Yuval Ofek

Dan Arnon

Ariel J Ish-Shalom

Samuel Krikler

Zoran Cakeljic

Michael Hirsch

Haim Bitner

Nadav Kedem

Peter Kamvysselis

Amnon Yeger

Method and apparatus are disclosed for a computer system including host computers and storage elements. The host computers may be configured into a host domain and the storage elements configured into a storage domain. The storage domain includes a plurality of primary storage devices and a secondary storage device. The secondary storage device may be coupled to a plurality of the primary storage devices through a network. In another embodiment, the secondary storage device may send and receive information from a heterogeneous set of host computers. In another embodiment, connections for transfer of data onto the secondary storage element are created automatically.

Apparatus and methods for operating a computer storage system

Method and apparatus are disclosed for copying and backing up logical objects in a computer storage system. The logical objects are comprised of data blocks. The data blocks may be copied in any order. The data blocks may be copied or written from a storage media, such as a tape, in parallel.

Apparatus and methods for copying, backing up and restoring logical objects in a computer storage system by transferring blocks out of order or in parallel

Method and apparatus for copying, transferring, backing up and restoring data are disclosed. The data can be copied, backed up or restored in segments sizes larger than the data blocks which comprise a logical object. In some embodiments, the segment can correspond to a track of a primary storage device and the data blocks to a fixed size block. In some instances, copying, storage and transfer of the segments which include multiple data blocks can result in transfer of a data block not in a logical object.

Apparatus and methods for copying, backing up, and restoring data using a backup segment size larger than the storage block size

A digital data processing system comprises a host information generating device, a mass storage subsystem, and a back-up information storage subsystem. The host information generating device generates information and provides it to the mass storage subsystem for storage. The mass storage subsystem receives and stores the generated information from the host information generating device and transfers the generated information to the storage element for storage, and further transfers the generated information to the back-up information storage subsystem. The back-up information storage subsystem receives and stores the generated information from the mass storage subsystem's storage subsystem receives and stores the generated information from control element. The back-up information storage subsystem includes a filter/buffer module, a tape log module and a reconstruction module. The filter/buffer module filters and buffers the information received from the mass storage subsystem and provides the buffered information to the tape log module for storage. The tape log module stores the information received from the filter/buffer module in logging fashion on tape cartridges. The filter/buffer module filters the information received from the mass storage subsystem so as to reduce the amount of information to be logged, so that, if the host changes the information while it is being buffered, the filter/buffer module will provide only the most recent information to the tape log module for storage. If a failure occurs in the mass storage subsystem, the reconstruction module can reconstruct the information that was on the failed device using the stored information from the tape log module and the buffered information.

Efficient index arrangement and method for identifying valid records

A digital data processing system comprises a host information generating device, a mass storage subsystem, and a back-up information storage subsystem. The host information generating device generates information and provides it to the mass storage subsystem for storage. The mass storage subsystem receives the generated information from the host information generating device and transfers the generated information to the storage element for storage, and further transfers the generated information to the back-up information storage subsystem. The back-up information storage subsystem receives and stores the generated information from the mass storage subsystem's control element. The back-up information storage subsystem includes a filter/buffer module, a tape log module and a reconstruction module. The filter/buffer module filters and buffers the information received from the mass storage subsystem and provides the buffered information to the tape log module for storage. The tape log module stores the information received from the filter/buffer module in logging fashion on tape cartridges. The filter/buffer module filters the information received from the mass storage subsystem so as to reduce the amount of information to be logged, so that, if the host changes the information while it is being buffered, the filter/buffer module will provide only the most recent information to the tape log module for storage. If a failure occurs in the mass storage subsystem, the reconstruction module can reconstruct the information that was on the failed device using the stored information from the tape log module and the buffered information.

Growing community of inventors

Holon, Israel

Sharon Galtzur