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  1. Proceedings of the 6th ACM SIGPLAN/SIGOPS international conference on Virtual execution environments (VEE '10)
  2. Optimizing crash dump in virtualized environments
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Optimizing crash dump in virtualized environments

Content Provider ACM Digital Library
Author Chen, Haibo Huang, Yijian Zang, Binyu
Abstract Crash dump, or core dump is the typical way to save memory image on system crash for future offline debugging and analysis. However, for typical server machines with likely abundant memory, the time of core dump can significantly increase the mean time to repair (MTTR) by delaying the reboot-based recovery, while not dumping the failure context for analysis would risk recurring crashes on the same problems. In this paper, we propose several optimization techniques for core dump in virtualized environments, in order to shorten the MTTR of consolidated virtual machines during crashes. First, we parallelize the process of crash dump and the process of rebooting the crashed VM, by dynamically reclaiming and allocating memory between the crashed VM and the newly spawned VM. Second, we use the virtual machine management layer to introspect the critical data structures of the crashed VM to filter out the dump of unused memory. Finally, we implement disk I/O rate control between core dump and the newly spawned VM according to user-tuned rate control policy to balance the time of crash dump and quality of services in the recovery VM. We have implemented a working prototype, Vicover, that optimizes core dump on system crash of a virtual machine in Xen, to minimize the MTTR of core dump and recovery as a whole. In our experiment on a virtualized TPC-W server, Vicover shortens the downtime caused by crash dump by around 5X.
Starting Page 25
Ending Page 36
Page Count 12
File Format PDF
ISBN 9781605589107
DOI 10.1145/1735997.1736003
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2010-03-17
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Parallel core dump Core dump Virtual machines
Content Type Text
Resource Type Article
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