Emc Corporation

Constantine Antonovich

Philip Derbeko

Arieh Don

Alexandr Veprinsky

Assaf Natanzon

Alex Veprinsky

Anat Eyal

A method, computer program product, and computing system for receiving a Mode Select command concerning a single LUN from each of a plurality of potential hosts. Each Mode Select command defines control information and host identifier information concerning the potential host associated with the Mode Select command. The received Mode Select commands are processed serially and in accordance with the order in which the Mode Select commands were received. The first Mode Select command received is accepted and subsequent Mode Select commands received are rejected, thus defining an accepted Mode Select command and one or more rejected Mode Select commands. The control information and host identifier information included within the accepted Mode Select command are written to a buffer associated with the single LUN. The buffer includes a control field and a GUID field.

System and method for improving cache performance

A method, computer program product, and computing system for providing an option to a user of a cache system to have a copy of at least one IO operation directed toward the cache system redundantly provided to a remote device. If the user selects to have the copy of at least one IO operation redundantly provided, the copy of the at least one IO operation directed toward the cache system is provided to the remote device.

System and method for cache management

A method for receiving a Mode Select command concerning a LUN from a host. The Mode Select command defines control information and host identifier information concerning the host associated with the Mode Select command. The Mode Select command is processed to determine if the control information included within the Mode Select command signifies an intent by the host to relinquish control of the LUN. If the control information signifies an intent to relinquish control of the LUN, the host identifier information included within the Mode Select command is processed to confirm that it matches LUN control identifier information that defines the host that currently controls the LUN. If the host identifier information matches the LUN control identifier information, at least the control information included within the Mode Select command is written to a buffer associated with the LUN. The buffer includes a control field and a GUID field.

System and method for improving cache performance upon detection of a LUN control event

A method, computer program product, and computing system for receiving a Mode Select command concerning a logical unit number (LUN) from a first host, wherein the Mode Select command defines control information and host identifier information concerning the first host, and the LUN is currently being controlled by a second host. The Mode Select command is processed to determine if the control information and host identifier information included within the Mode Select command signifies an intent by the first host to seize control of the LUN from the second host. If the control information and host identifier information signifies an intent to seize control of the LUN from the second host, the control information and host identifier information included within the Mode Select command is written to a buffer associated with the LUN, wherein the buffer includes a control field and a globally unique identifier (GUID) field.

System and method for obtaining control of a logical unit number

A method, computer program product, and computing system for determining at least one LUN that was being controlled by a host prior to a crash event concerning the host, thus define at least one target LUN. A Mode Select command is prepared for the at least one target LUN, wherein the Mode Select command defines control information and host identifier information concerning the host. The Mode Select command is processed to determine if the control information and host identifier information included within the Mode Select command matches control information and host identifier information included within a buffer associated with the at least one target LUN. If the control information and host identifier information included within the Mode Select command matches the control information and host identifier information included within the buffer, control of the at least one target LUN is granted to the host.

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Ramat Gan, Israel

Constantine Antonovich