交換システムへ既製コンピュータを適用するための可用性と実時間性の向上に関する研究

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著者

    • 池邉, 隆 イケベ, タカシ

書誌事項

タイトル

交換システムへ既製コンピュータを適用するための可用性と実時間性の向上に関する研究

著者名

池邉, 隆

著者別名

イケベ, タカシ

学位授与大学

電気通信大学

取得学位

博士 (工学)

学位授与番号

甲第486号

学位授与年月日

2008-03-24

注記・抄録

博士論文

2007

The switching system provides lifeline network service such as telephony service, and isrequired to serve more than 99.999% time of a year. Typical network service requires tobe performed as real time; the call control should be performed within deadline. Thereforeswitching system of PSTN (Public Switched Telephone Networks) had been developed byusing specialized hardware and software in order to satisfy service availability and realtime capability.Though, the cost of the specialized switching system is high, the most of the specializedswitching system is aging, and hard to obtain the repair parts. Consequently, the demandof replace aging specialized switching system by using cost effective COTS (Commercialoff-the-shelf) such as Intel Architecture computer, is so high. However, it is difficult to satisfythe requirements of the switching system by just applying COTS system. Especially,availability and real time capability are missing on COTS system.In this paper, I propose the approaches that improve availability and real time capabilityof COTS system, using Intel x86-64 CPU SMP machine and Linux, in order to satisfyrequirements of the switching system.First, I propose the live patching approach that enables dynamic modification of processand kernel without restarting. The proposed approach enables to fix the software withoutrestarting, within deadline, and without disrupting real time service.Then I propose the priority control of disk IO that reduces the maximum response timeof high-priority write system call. The adoption of COTS components causes the callprocessing to record transaction log to hard disk drive, and that recording increase in theservice response time. The proposed approach reduces bottlenecks of write mechanism inthe kernel.The proposed approaches enable to adopt COTS system to switching system. Theapproaches are not only for switching system but also for the system which use COTSsystem and improve the availability and the real time capability.

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各種コード

  • NII論文ID(NAID)
    500000435587
  • NII著者ID(NRID)
    • 8000000436890
  • 本文言語コード
    • jpn
  • NDL書誌ID
    • 000009368712
  • データ提供元
    • 機関リポジトリ
    • NDL ONLINE
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