unexpected reboot

[Etienne]

hello

I am trying to manage an ubuntu server (8.04 LTS) and I just had an
unexpected reboot at 11:04 am this morning.
I am wondering why .
here is the syslog before / after reboot. It does not say anything.

Where can I found more information on the event ?

Sep  1 10:17:01 sd-12345 /USR/SBIN/CRON[3484]: (root) CMD (   cd / &&
run-parts --report /etc/cron.hourly)
Sep  1 10:39:01 sd-12345 /USR/SBIN/CRON[3488]: (root) CMD (  [ -x
/usr/lib/php5/maxlifetime ] && [ -d /var/lib/php5 ] && find
/var/lib/php5/ -type f -cmin +$
(/usr/lib/php5/maxlifetime) -print0 | xargs -r -0 rm)
Sep  1 11:04:00 sd-12345 syslogd 1.5.0#1ubuntu1: restart.
Sep  1 11:04:00 sd-12345 kernel: Inspecting /boot/System.map-2.6.24-24-server
Sep  1 11:04:00 sd-12345 kernel: Loaded 28778 symbols from
/boot/System.map-2.6.24-24-server.
Sep  1 11:04:00 sd-12345 kernel: Symbols match kernel version 2.6.24.
Sep  1 11:04:00 sd-12345 kernel: Loaded 11183 symbols from 54 modules.
Sep  1 11:04:00 sd-12345 kernel: [    0.000000] Initializing cgroup
subsys cpuset
Sep  1 11:04:00 sd-12345 kernel: [    0.000000] Initializing cgroup subsys cpu
Sep  1 11:04:00 sd-12345 kernel: [    0.000000] Linux version
2.6.24-24-server (buildd at yellow) (gcc version 4.2.4 (Ubuntu
4.2.4-1ubuntu3)) #1 SMP Tue Aug 18
16:51:43 UTC 2009 (Ubuntu 2.6.24-24.59-server)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000] Command line:
root=/dev/md1 ro quiet splash
Sep  1 11:04:00 sd-12345 kernel: [    0.000000] BIOS-provided physical RAM map:
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
0000000000000000 - 000000000009fc00 (usable)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
000000000009fc00 - 00000000000a0000 (reserved)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
00000000000e0000 - 0000000000100000 (reserved)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
0000000000100000 - 000000007d135000 (usable)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
000000007d135000 - 000000007d236000 (ACPI NVS)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
000000007d236000 - 000000007ddf2000 (usable)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
000000007ddf2000 - 000000007ddf4000 (reserved)
Sep  1 11:04:00 sd-12345 kernel: [    0.000000]  BIOS-e820:
000000007ddf4000 - 000000007de71000 (usable)
../..

any feedback will be appreciated :-)

etienne