Emc IP Holding Company LLC

Dell Products Inc.

Liran Loya

Alex Kulakovsky

Ahia Lieber

Amitai Alkalay

Lior Kamran

Yuval Harduf

Sally Golan

Pavel Shlakhter

Yossi Dvori

Techniques for peer node recovery can include: receiving a notification regarding an occurrence of a trigger condition which indicates to perform recovery processing for a first storage device of a first node, wherein the first storage device is used as a boot device for the first node; and responsive to receiving the notification of the trigger condition, performing recovery processing for the first storage device of the first node comprising: performing a network boot of the first node over an internal network connection using a preboot execution (PXE) server of the second node; reimaging the first storage device of the first node using content from a second storage device of the second node, wherein the content includes a bootable partition comprising an operating system; and using the bootable partition of the first storage device of the first node, booting the first node to load and run the operating system.

Techniques for peer node recovery

A method of managing operation of a computing device is provided. The method includes (a) running a system scheduler that schedules execution of a first application and a second application on a central processing unit (CPU) core of the computing device; (b) while the first application is executing on the core, detecting, by the first application, a context-switch opportunity; and (c) issuing, by the first application in response to detecting the context-switch opportunity, a blocking operation that triggers the system scheduler to perform a rescheduling operation between the first and second applications on the CPU core. An apparatus, system, and computer program product for performing a similar method are also provided.

Techniques for scheduling between applications on a core

A method for use in a first storage array, comprising: detecting whether a second storage array has designated the first storage array as a locally-preferred storage array, the detecting being performed when a first link between the second storage array and a witness node is down; setting a value of a first configuration setting to indicate that the first storage array is designated as a system-preferred storage array, the value of the first configuration setting being stored in a memory of the first storage array, the value of the first configuration setting being set only when the second storage array has designated the first storage array as a locally-preferred storage array; detecting, by the first storage array; and when the second link is down, assuming one of an active role or a passive role based, at least in part, on the value of the first configuration setting.

Storage system with passive witness node

An aspect of module mirroring during an non-disruptive upgrade includes creating a mirrored set of management processes for a storage cluster that is subject to an upgrade a new software version, interconnecting components of the mirrored set and an original set of the management processes while the storage cluster is actively managed by an original set of management processes, and performing a handover between the management processes of the storage cluster.

Module mirroring during non-disruptive upgrade

Moving from a back-to-back topology to a switched topology in an InfiniBand network includes, prior to connecting a switch for a first storage controller in the network and during reboot of the first storage controller, waiting for a second storage controller in the network to become master, and upon the second storage controller becoming master, changing cache files for local ports on the first storage controller regarding adjacent ports' LID assignments. An aspect further includes restarting a system manager for the first storage controller, connecting the first storage controller to the system with new LID assignments provided by changed files on first storage controller, and upon the first storage controller becoming active, rebooting the second storage controller, changing the LID assignments in the active storage controller, and adding new switches to the system.

Growing community of inventors

Hod Hasharon, Israel

Liran Loya