NDLI: kMemvisor: flexible system wide memory mirroring in virtual environments

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kMemvisor: flexible system wide memory mirroring in virtual environments

Content Provider	ACM Digital Library
Author	Dong, Haoliang Wang, Bin Dong, Yaozu Qi, Zhengwei Guan, Haibing Sun, Wei
Abstract	Today's commercial cloud service providers require the availability with an annual uptime percentage at least 99.95\%. While memory errors become norms instead of exceptions with the increasing memory's density and capacity in cloud applications. Thus, uncorrected errors from DRAM can be a significant source of system downtime. To address this increasingly important concern, both hardware and software memory mirroring technologies are studied nowadays to provide memory high availability. However, hardware solutions like mirror memory, which uses doubled chip, need dedicated and costly peripheral hardware. While existing software approaches, i.e., virtual machine's checkpoint technology, reduce the expense but incur the high overhead in practical usage. In this paper, we present a novel system called \emph{k}Memvisor to provide system-wide high availability memory mirroring. It is a software approach achieving flexible multi-granularity memory mirroring via virtualization and binary translation technology. Specifically, kMemvisor first creates backup space of the same size of the specified memory for applications or virtual machines. We can flexibly set memory areas to be mirrored or not mirrored from application level to system-wide. Then, all memory write instructions in the native memory space are captured and instrumented by mirror memory write instructions to synchronize the data in backup space. Furthermore, this instruction level memory synchronization reduces backup overhead and lowers the probability of data loss compared with traditional software approaches. So kMemvisor could use data from the backup space to recover when memory failures happen. The results show that kMemvisor causes 55% overhead in the worst case of system-wide high availability and 30% average for the real world applications, which outperforms the state-of-the-art software approaches even in the worst case.
Starting Page	251
Ending Page	262
Page Count	12
File Format	PDF
ISBN	9781450319102
DOI	10.1145/2462902.2462910
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-06-17
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	System-wide high availability Flexible memory mirroring
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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kMemvisor: flexible system wide memory mirroring in virtual environments

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