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Xen ゲストで hwclock を開くことができず、'No usable clock interface found' エラーが発生します

Solution Verified - Updated -

Issue

  • hwclock コマンドを実行すると、Xen サーバの domU が以下のエラーを報告します。

    # hwclock --debug
    hwclock from util-linux-2.13-pre7
    hwclock:Open of /dev/rtc failed, errno=19:No such device.
    No usable clock interface found.
    Cannot access the Hardware Clock via any known method.
    
  • ただし、Hypervisor (dom0) では、hwclock コマンドの実行時にこの問題は発生しません。

Environment

  • Red Hat Enterprise Linux 5.6
  • Xen DomU

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