How can I find out what is happening? (case #18901615)

ianch-nas:~# du -csh /var/log/*
912k    /var/log/auth.log
1.1M    /var/log/cron.log
1.3M    /var/log/cups
130M    /var/log/daemon.log
16k     /var/log/ddns
240k    /var/log/debug
16k     /var/log/dmesg
576k    /var/log/exim
139M    /var/log/frontview
16k     /var/log/fsck.log
4.8M    /var/log/kern.log
16k     /var/log/ksymoops
16k     /var/log/LeafP2P.log
128k    /var/log/LeafP2P.log.old
0       /var/log/lpr.log
0       /var/log/mail.log
4.1M    /var/log/messages
256k    /var/log/mt-daapd.log
144k    /var/log/netatalk.log
944k    /var/log/netatalk.log.old
16k     /var/log/ntpstats
128k    /var/log/proftpd.log
16k     /var/log/raidiator_version
16k     /var/log/ReadyNAS_Remote.log
144k    /var/log/rsyncd.log
624k    /var/log/samba
0       /var/log/slimserver.log
135M    /var/log/syslog
2.0M    /var/log/upnp-av.log
128k    /var/log/user.log
421M    total
ianch-nas:~# du -csh /var/log/frontview/*
2.2M    /var/log/frontview/access.log
134M    /var/log/frontview/backup
1.2M    /var/log/frontview/command.log
16k     /var/log/frontview/config_backup_restore.log
16k     /var/log/frontview/disk_smart_2012_06_17.log
16k     /var/log/frontview/disk_smart_2012_06_24.log
16k     /var/log/frontview/disk_smart_2012_07_01.log
16k     /var/log/frontview/disk_smart_2012_07_08.log
16k     /var/log/frontview/disk_smart_2012_07_15.log
16k     /var/log/frontview/disk_smart_2012_07_22.log
16k     /var/log/frontview/disk_smart_2012_07_29.log
16k     /var/log/frontview/disk_smart_2012_08_06.log
16k     /var/log/frontview/disk_smart_2012_08_13.log
16k     /var/log/frontview/disk_smart_2012_09_05.log
16k     /var/log/frontview/disk_usage.log
16k     /var/log/frontview/ecounter_2012_08_13_0000.log
16k     /var/log/frontview/ecounter_2012_08_14_0000.log
16k     /var/log/frontview/ecounter_2012_08_15_0000.log
16k     /var/log/frontview/ecounter_2012_08_16_0000.log
16k     /var/log/frontview/ecounter_2012_09_05_1434.log
16k     /var/log/frontview/enclosure.log
320k    /var/log/frontview/error.log
16k     /var/log/frontview/memory.log
16k     /var/log/frontview/msmtp.log
16k     /var/log/frontview/partitions_2012_06_17.log
16k     /var/log/frontview/partitions_2012_06_24.log
16k     /var/log/frontview/partitions_2012_07_01.log
16k     /var/log/frontview/partitions_2012_07_08.log
16k     /var/log/frontview/partitions_2012_07_15.log
16k     /var/log/frontview/partitions_2012_07_22.log
16k     /var/log/frontview/partitions_2012_07_29.log
16k     /var/log/frontview/partitions_2012_08_06.log
16k     /var/log/frontview/partitions_2012_08_13.log
16k     /var/log/frontview/partitions_2012_09_05.log
16k     /var/log/frontview/raid_config_2012_06_17.log
16k     /var/log/frontview/raid_config_2012_06_24.log
16k     /var/log/frontview/raid_config_2012_07_01.log
16k     /var/log/frontview/raid_config_2012_07_08.log
16k     /var/log/frontview/raid_config_2012_07_15.log
16k     /var/log/frontview/raid_config_2012_07_22.log
16k     /var/log/frontview/raid_config_2012_07_29.log
16k     /var/log/frontview/raid_config_2012_08_06.log
16k     /var/log/frontview/raid_config_2012_08_13.log
16k     /var/log/frontview/raid_config_2012_09_05.log
16k     /var/log/frontview/smart_errors_hdc
16k     /var/log/frontview/smart_errors_hde
16k     /var/log/frontview/smart_errors_sda
16k     /var/log/frontview/smart_errors_sdb
80k     /var/log/frontview/spool.err
240k    /var/log/frontview/spool.log
16k     /var/log/frontview/status.log-new
176k    /var/log/frontview/status.log-old
16k     /var/log/frontview/ups.log
139M    total