[질문]시스템이 이유없이 다운..

안녕하세요.
날씨가 꽤 덥네요. 완전 여름날씨 같다는 *^^*
더위 잘 이기시구요..

제가 관리하는 시스템이 이유없이 다운이 됩니다.
파워가 내려 가는건 아니구요, 콘솔상에 아무것도 나타나지 않고
먹통이 되 버립니다.
혹시나 H/W적 문제인가 해서 보드와 레이드 컨트롤러도 교체한 상태입니다.
왜 이런 현상이 나타나는지 조언 부탁 드립니다.
아래는 messages 내용 입니다.

-messages 내용-
May 14 04:04:21 idisk syslogd 1.4.1: restart.
May 16 09:06:12 idisk syslogd 1.4.1: restart.
May 16 09:06:12 idisk syslog: syslogd startup succeeded
May 16 09:06:12 idisk kernel: klogd 1.4.1, log source = /proc/kmsg started.
May 16 09:06:12 idisk kernel: Linux version 2.4.21-32.ELsmp (bhcompile@tweety.build.redhat.com) (gcc version 3.2.3 20030502 (Red Hat
Linux 3.2.3-52)) #1 SMP Fri Apr 15 21:17:59 EDT 2005
May 16 09:06:12 idisk kernel: BIOS-provided physical RAM map:
May 16 09:06:12 idisk kernel: BIOS-e820: 0000000000000000 - 000000000009f400 (usable)
May 16 09:06:12 idisk kernel: BIOS-e820: 000000000009f400 - 00000000000a0000 (reserved)
May 16 09:06:12 idisk kernel: BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved)
May 16 09:06:12 idisk kernel: BIOS-e820: 0000000000100000 - 00000000dfff3000 (usable)
May 16 09:06:12 idisk kernel: BIOS-e820: 00000000dfff3000 - 00000000dfffb000 (ACPI data)
May 16 09:06:12 idisk kernel: BIOS-e820: 00000000dfffb000 - 00000000e0000000 (reserved)
May 16 09:06:12 idisk kernel: BIOS-e820: 00000000fec00000 - 00000000fed00000 (reserved)
May 16 09:06:12 idisk kernel: BIOS-e820: 00000000fee00000 - 00000000fee10000 (reserved)
May 16 09:06:12 idisk kernel: BIOS-e820: 00000000ffc00000 - 0000000100000000 (reserved)
May 16 09:06:12 idisk syslog: klogd startup succeeded
May 16 09:06:12 idisk kernel: BIOS-e820: 0000000100000000 - 000000011bfff000 (usable)
May 16 09:06:12 idisk kernel: 3647MB HIGHMEM available.
May 16 09:06:13 idisk kernel: 896MB LOWMEM available.
May 16 09:06:13 idisk irqbalance: irqbalance startup succeeded
May 16 09:06:13 idisk kernel: found SMP MP-table at 000f4fa0
May 16 09:06:13 idisk kernel: hm, page 000f4000 reserved twice.
May 16 09:06:13 idisk kernel: hm, page 000f5000 reserved twice.
May 16 09:06:13 idisk portmap: portmap startup succeeded
May 16 09:06:13 idisk kernel: hm, page 000f2000 reserved twice.
May 16 09:06:13 idisk kernel: hm, page 000f3000 reserved twice.
May 16 09:06:13 idisk kernel: NX protection not present; using segment protection
May 16 09:06:13 idisk rpc.statd[2673]: Version 1.0.6 Starting
May 16 09:06:13 idisk kernel: On node 0 totalpages: 1163263
May 16 09:06:13 idisk kernel: zone(0): 4096 pages.
May 16 09:06:13 idisk kernel: zone(1): 225280 pages.
May 16 09:06:13 idisk kernel: zone(2): 933887 pages.
May 16 09:06:13 idisk nfslock: rpc.statd startup succeeded
May 16 09:06:13 idisk kernel: ACPI: Searched entire block, no RSDP was found.
May 16 09:06:13 idisk kernel: ACPI: RSDP located at physical address c00f4f20
May 16 09:06:13 idisk kernel: RSD PTR v2 [HP ]
May 16 09:06:13 idisk mdmonitor: mdadm startup succeeded
May 16 09:06:13 idisk kernel: __va_range(0xdfff3000, 0x28): idx=33 mapped at fffdd000
........
May 16 09:06:13 idisk kernel: LAPIC (acpi_id[0x0000] id[0x0] enabled[1])
May 16 09:06:13 idisk kernel: CPU 0 (0x0000) enabledProcessor #0 Unknown CPU [15:4] APIC version 20
May 16 09:06:14 idisk kernel:
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0004] id[0x4] enabled[0])
May 16 09:06:14 idisk kernel: CPU 1 (0x0400) disabled
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0002] id[0x2] enabled[0])
May 16 09:06:14 idisk kernel: CPU 2 (0x0200) disabled
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0006] id[0x6] enabled[1])
May 16 09:06:14 idisk kernel: CPU 3 (0x0600) enabledProcessor #6 Unknown CPU [15:4] APIC version 20
May 16 09:06:14 idisk kernel:
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0001] id[0x1] enabled[1])
May 16 09:06:14 idisk kernel: CPU 4 (0x0100) enabledProcessor #1 Unknown CPU [15:4] APIC version 20
May 16 09:06:14 idisk kernel:
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0005] id[0x5] enabled[0])
May 16 09:06:14 idisk kernel: CPU 5 (0x0500) disabled
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0003] id[0x3] enabled[0])
May 16 09:06:14 idisk kernel: CPU 6 (0x0300) disabled
May 16 09:06:14 idisk kernel: LAPIC (acpi_id[0x0007] id[0x7] enabled[1])
May 16 09:06:14 idisk kernel: CPU 7 (0x0700) enabledProcessor #7 Unknown CPU [15:4] APIC version 20
...
May 16 08:56:27 idisk fsck: /: clean, 116059/2562240 files, 692045/5120396 blocks
May 16 09:06:15 idisk kernel: CPU0: Intel(R) Xeon(TM) CPU 3.00GHz stepping 03
May 16 08:56:27 idisk rc.sysinit: Checking root filesystem succeeded
May 16 09:06:16 idisk kernel: per-CPU timeslice cutoff: 1759.61 usecs.
May 16 08:56:27 idisk rc.sysinit: Remounting root filesystem in read-write mode: succeeded
May 16 09:06:16 idisk kernel: task migration cache decay timeout: 10 msecs.
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: enabled ExtINT on CPU#0
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: ESR value before enabling vector: 00000000
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: ESR value after enabling vector: 00000000
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: Booting processor 1/1 eip 2000
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: Initializing CPU#1
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: masked ExtINT on CPU#1
May 16 08:56:27 idisk modprobe: modprobe: Can't locate module block-major-43
May 16 09:06:16 idisk kernel: ESR value before enabling vector: 00000000
...
May 16 09:06:38 idisk kernel: VFS: find_free_dqentry(): Data block full but it shouldn't.
May 16 09:06:38 idisk kernel: VFS: Error -5 occured while creating quota.
May 16 09:10:01 idisk snmpd[3118]: Received SNMP packet(s) from 127.0.0.1
May 16 09:12:21 idisk nmbd[3307]: [2006/05/16 09:12:21, 0] nmbd/nmbd_become_lmb.c:become_local_master_stage2(396)
May 16 09:12:21 idisk nmbd[3307]: *****
May 16 09:12:21 idisk nmbd[3307]:
May 16 09:12:21 idisk nmbd[3307]: Samba name server IDISK is now a local master browser for workgroup INDY001 on subnet 172.17.1.7

May 16 09:12:21 idisk nmbd[3307]:
May 16 09:12:21 idisk nmbd[3307]: *****
May 17 04:04:31 idisk nmbd[3307]: [2006/05/17 04:04:31, 0] nmbd/nmbd.c:process(542)
May 17 04:04:31 idisk nmbd[3307]: Got SIGHUP dumping debug info.
May 17 04:04:31 idisk nmbd[3307]: [2006/05/17 04:04:31, 0] nmbd/nmbd_workgroupdb.c:dump_workgroups(284)
May 17 04:04:31 idisk nmbd[3307]: dump_workgroups()
May 17 04:04:31 idisk nmbd[3307]: dump workgroup on subnet 172.17.1.7: netmask= 255.255.0.0:
May 17 04:04:31 idisk nmbd[3307]: WORKGROUP(3) current master browser = └³└┌┴
May 17 04:04:31 idisk nmbd[3307]: INDY001(1) current master browser = IDISK
May 17 04:04:31 idisk nmbd[3307]: IDISK 40049a03 (InternetDISK)
May 17 10:47:33 idisk sshd(pam_unix)[29464]: session opened for user root by (uid=0)
May 17 11:59:42 idisk sshd(pam_unix)[4891]: session opened for user root by (uid=0)
May 17 11:59:53 idisk sshd(pam_unix)[4891]: session closed for user root
May 17 12:02:30 idisk sshd(pam_unix)[5048]: session opened for user root by (uid=0)
May 17 12:02:51 idisk sshd(pam_unix)[5048]: session closed for user root