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Method and System to Provide a Backup Virtual I/O Server (VIOS) in a Virtual Real Memory Environment

IP.com Disclosure Number: IPCOM000197763D
Publication Date: 2010-Jul-21
Document File: 2 page(s) / 20K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is method and system for providing a backup virtual I/O Server (VIOS) in a virtual real memory environment which can take over roles of a primary VIOS once the primary VIOS fails. A VIOS is a special-purpose LPAR that provides other client Logical Partitions (LPARs) with virtualized I/O resources such as virtualized real memory.

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Method and System to Provide a Backup Virtual I /O Server (VIOS) in a Virtual Real

Memory Environment

A method and system is disclosed for providing a backup virtual I/O Server (VIOS) in a virtual real memory environment which can take over roles of a primary VIOS once the primary VIOS fails. A VIOS is a special-purpose LPAR that provides other client Logical Partitions (LPARs) with virtualized I/O resources such as virtualized real memory.

A POWER Hypervisor* (PHYP) running on a server performs page-in and page-out requests to a storage disk on behalf of LPARs. Memory which is paged out is written to the disk storage handled by a VIOS. A VIOS and PHYP are in communication with each other through a Virtual Asynchronous Services Interface (VASI) driver.

The backup VIOS in accordance with the method and system disclosed herein has same access to the disk storage as the primary VIOS. The disk storage is placed on a Network-Attached Storage (NAS) that has visibility to the primary VIOS and the backup VIOS. Further, a backup VASI is also defined on the backup VIOS to enable communication with the PHYP.

During a normal operation, when the PHYP sends an I/O request to the primary VIOS for a page-in or page-out, the PHYP records the time at which the I/O request was made. Subsequently, if the primary VIOS does not respond with a predetermined amount of time the PHYP assumes that the primary VIOS is failed. Accordingly, the PHYP sends a "Stopped" state change message to p...