Separation of Virtual Machine I/O in Cloud Systems
- 주제(키워드) File systems , Virtualization , Metadata , Buffer storage , Virtual machine monitors , Computer crashes , Semantics , Journaling , file system , virtualized system , virtualization , buffer cache , commit
- 주제(기타) Computer Science, Information Systems
- 주제(기타) Engineering, Electrical & Electronic
- 주제(기타) Telecommunications
- 설명문(일반) [Bahn, Hyokyung; Kim, Jisun] Ewha Womans Univ, Dept Comp Engn, Seoul 120750, South Korea
- 관리정보기술 faculty
- 등재 SCIE, SCOPUS
- OA유형 gold
- 발행기관 IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- 발행년도 2020
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000175452
- 본문언어 영어
- Published As http://dx.doi.org/10.1109/ACCESS.2020.3044172
초록/요약
Virtualization is widely used in modern computer systems ranging from personal computers to cloud servers as it provides various heterogeneous platforms at low cost. However, due to its nested software structure in host and guest machines that are difficult to harmonize, it is challenging to manage resources efficiently in virtualized systems. In this article, we anatomize the overhead of virtualization associated with file system journaling and discover the excessively frequent commits that take place in virtualized systems. This is because the host triggers commit on every write request from all guest machines. This also generates unnecessary write traffic to storage. To remedy these problems, we propose the VM-separated commit, and implement it on QEMU-KVM and Ext4. Specifically, we devise a data structure that manages modified file blocks from each guest as a separate list and split the running transaction list into two sub-transactions based on this data structure upon a commit request from a guest. Measurement studies with Filebench and IOzone benchmarks show that the proposed policy improves the I/O throughput by 19.5% on average and up to 64.2% over existing systems. It also reduces the variability in performance.
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