CentOs에 nfs를 설치해서 이중화후 다음과 같은 증상이 있는데 도와 주십시요.

안녕하세요.
웹서버를 이중화 구성해서 시스템 가동중인데요 이상하게 잘 가동되다가 서버가 갑자기 리부팅을 하게 됩니다.
다음은 리부팅시 나타나는 로그입니다.감사합니다.
Oct  7 04:32:43 webserver1 syslogd 1.4.1: restart.
Oct  7 04:34:59 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 04:52:55 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 05:10:06 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 05:26:09 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 05:43:14 webserver1 ntpd[2902]: time reset +1.008873 s
Oct  7 05:46:50 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 05:47:54 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 3
Oct  7 07:23:20 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 07:27:41 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 09:39:46 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 09:56:24 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 12:47:51 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 13:04:11 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 13:55:26 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 14:12:26 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 20:29:00 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 20:45:16 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 22:11:09 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 22:44:48 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  7 23:02:40 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  7 23:18:59 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 00:10:27 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 00:27:16 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 01:36:21 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 01:52:34 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 03:01:32 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 03:17:52 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 03:52:04 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 04:09:07 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 04:43:38 webserver1 ntpd[2902]: time reset +0.334902 s
Oct  8 04:47:55 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 04:49:01 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 06:16:05 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 06:24:41 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 11:57:52 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 12:14:05 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 13:57:08 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 14:13:40 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 16:30:45 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 16:47:18 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 18:30:11 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 18:46:48 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 20:29:38 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 20:46:19 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 21:21:14 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 21:37:34 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  8 22:12:39 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  8 22:28:45 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 00:12:11 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 00:28:14 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 02:28:42 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 02:44:51 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 04:27:57 webserver1 ntpd[2902]: time reset +0.890166 s
Oct  9 04:32:15 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 04:33:20 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 04:40:53 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 04:46:14 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 05:08:49 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 05:10:17 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 05:17:25 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 05:23:51 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 05:45:13 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 05:52:58 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 06:02:25 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 06:11:00 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 07:18:54 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 07:35:24 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 09:01:00 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 09:17:50 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 10:27:04 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 10:43:09 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 13:00:38 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 13:16:58 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 13:51:15 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 14:08:12 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 14:42:48 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 14:59:25 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 15:34:38 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 15:50:40 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 19:15:54 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 19:49:38 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 21:32:32 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 21:49:08 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 22:41:13 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct  9 22:57:24 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct  9 23:31:46 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 00:05:44 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 00:23:19 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 00:56:58 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 04:22:31 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 04:38:53 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 04:55:58 webserver1 ntpd[2902]: time reset +0.544522 s
Oct 10 04:59:52 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 05:00:56 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 05:37:38 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 05:38:45 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 05:50:29 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 05:51:35 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 05:58:00 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 06:02:16 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 06:23:52 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 06:32:08 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 08:24:01 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 08:40:14 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 09:15:21 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 09:48:38 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 10:23:14 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 10:39:55 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 12:39:37 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 12:56:28 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 13:31:19 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 13:47:42 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 14:39:05 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 15:13:03 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 15:30:32 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 15:47:09 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 16:05:00 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 16:38:22 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 17:12:54 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 18:03:45 webserver1 ntpd[2902]: synchronized to 203.248.240.140, stratum 2
Oct 10 18:55:08 webserver1 ntpd[2902]: synchronized to LOCAL(0), stratum 10
Oct 10 20:37:04 webserver1 syslogd 1.4.1: restart.

Oct 10 20:37:04 webserver1 kernel: klogd 1.4.1, log source = /proc/kmsg started.
Oct 10 20:37:04 webserver1 kernel: Bootdata ok (command line is ro root=/dev/VolGroup00/LogVol00 rhgb quiet)
Oct 10 20:37:04 webserver1 kernel: Linux version 2.6.18-8.1.15.el5xen (mockbuild@builder6.centos.org) (gcc version 4.1.1 20070105 (Red Hat 4.1.1-52)) #1 SMP Mon Oct 22 09:01:12 EDT 2007
Oct 10 20:37:04 webserver1 kernel: BIOS-provided physical RAM map:
Oct 10 20:37:04 webserver1 kernel:  Xen: 0000000000000000 - 00000000f3cb2000 (usable)
Oct 10 20:37:04 webserver1 kernel: DMI 2.4 present.
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x04] lapic_id[0x04] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x02] lapic_id[0x02] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x06] lapic_id[0x06] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x01] lapic_id[0x01] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x05] lapic_id[0x05] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x03] lapic_id[0x03] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC (acpi_id[0x07] lapic_id[0x07] enabled)
Oct 10 20:37:04 webserver1 kernel: ACPI: LAPIC_NMI (acpi_id[0xff] dfl dfl lint[0x1])