Непонятно что в /var/log съело несколько гигабайт.

4,0K	/var/log/alternatives.log
108K	/var/log/alternatives.log.1
4,0K	/var/log/alternatives.log.2.gz
4,0K	/var/log/alternatives.log.3.gz
4,0K	/var/log/alternatives.log.4.gz
4,0K	/var/log/alternatives.log.5.gz
4,0K	/var/log/alternatives.log.6.gz
4,0K	/var/log/alternatives.log.7.gz
8,0K	/var/log/alternatives.log.8.gz
1,6M	/var/log/apt
0	/var/log/aptitude
4,0K	/var/log/aptitude.1.gz
108K	/var/log/auth.log
168K	/var/log/auth.log.1
4,0K	/var/log/auth.log.2.gz
4,0K	/var/log/auth.log.3.gz
4,0K	/var/log/auth.log.4.gz
4,0K	/var/log/bittorrent
4,0K	/var/log/boot
4,0K	/var/log/btmp
0	/var/log/btmp.1
176K	/var/log/ConsoleKit
48K	/var/log/cups
13M	/var/log/daemon.log
16M	/var/log/daemon.log.1
580K	/var/log/daemon.log.2.gz
432K	/var/log/daemon.log.3.gz
612K	/var/log/daemon.log.4.gz
380K	/var/log/debug
484K	/var/log/debug.1
16K	/var/log/debug.2.gz
16K	/var/log/debug.3.gz
16K	/var/log/debug.4.gz
44K	/var/log/dmesg
44K	/var/log/dmesg.0
12K	/var/log/dmesg.2.gz
12K	/var/log/dmesg.3.gz
12K	/var/log/dmesg.4.gz
2,2M	/var/log/dpkg.log
32K	/var/log/dpkg.log.1
4,0K	/var/log/dpkg.log.2.gz
8,0K	/var/log/dpkg.log.3.gz
4,0K	/var/log/dpkg.log.4.gz
16K	/var/log/dpkg.log.5.gz
12K	/var/log/dpkg.log.6.gz
12K	/var/log/dpkg.log.7.gz
84K	/var/log/dpkg.log.8.gz
24K	/var/log/DwarfTherapist
52K	/var/log/exim4
8,0K	/var/log/faillog
8,0K	/var/log/fontconfig.log
12K	/var/log/fsck
488K	/var/log/gdm3
14M	/var/log/installer
2,6G	/var/log/kern.log
1,7M	/var/log/kern.log.1
192K	/var/log/kern.log.2.gz
168K	/var/log/kern.log.3.gz
160K	/var/log/kern.log.4.gz
16K	/var/log/lastlog
0	/var/log/lpr.log
4,0K	/var/log/mail.err
4,0K	/var/log/mail.info
4,0K	/var/log/mail.log
4,0K	/var/log/mail.warn
2,0G	/var/log/messages
1,2M	/var/log/messages.1
164K	/var/log/messages.2.gz
144K	/var/log/messages.3.gz
140K	/var/log/messages.4.gz
4,0K	/var/log/news
44K	/var/log/pm-powersave.log
16K	/var/log/pm-powersave.log.1
4,0K	/var/log/pm-powersave.log.2.gz
4,0K	/var/log/pm-powersave.log.3.gz
0	/var/log/popularity-contest
144K	/var/log/popularity-contest.0
32K	/var/log/popularity-contest.1.gz
32K	/var/log/popularity-contest.2.gz
32K	/var/log/popularity-contest.3.gz
32K	/var/log/popularity-contest.4.gz
32K	/var/log/popularity-contest.5.gz
32K	/var/log/popularity-contest.6.gz
0	/var/log/pycentral.log
1,9M	/var/log/samba
184K	/var/log/syslog
2,6G	/var/log/syslog.1
112K	/var/log/syslog.2.gz
228K	/var/log/syslog.3.gz
144K	/var/log/syslog.4.gz
156K	/var/log/syslog.5.gz
160K	/var/log/syslog.6.gz
156K	/var/log/syslog.7.gz
4,0K	/var/log/unattended-upgrades
4,0K	/var/log/user.log
4,0K	/var/log/user.log.1
4,0K	/var/log/user.log.2.gz
4,0K	/var/log/user.log.3.gz
4,0K	/var/log/user.log.4.gz
680K	/var/log/wtmp
784K	/var/log/wtmp.1
12K	/var/log/Xorg.0.log
8,0K	/var/log/Xorg.0.log.old
16K	/var/log/Xorg.1.log
12K	/var/log/Xorg.1.log.old
12K	/var/log/Xorg.20.log
16K	/var/log/Xorg.20.log.old
8,0K	/var/log/Xorg.2.log
8,0K	/var/log/Xorg.2.log.old
12K	/var/log/Xorg.3.log
8,0K	/var/log/Xorg.3.log.old
8,0K	/var/log/Xorg.4.log
8,0K	/var/log/Xorg.4.log.old
8,0K	/var/log/Xorg.5.log
8,0K	/var/log/Xorg.5.log.old
8,0K	/var/log/Xorg.6.log
8,0K	/var/log/Xorg.6.log.old
8,0K	/var/log/Xorg.7.log
8,0K	/var/log/Xorg.7.log.old

root@GSV1:/var/log# du -sh /var/log/* | grep G
2,6G	/var/log/kern.log
2,0G	/var/log/messages
2,6G	/var/log/syslog.1

root@GSV1:/var/log# du -sh /var/log/* | grep G
2,6G	/var/log/kern.log
2,0G	/var/log/messages
2,6G	/var/log/syslog.1

> /var/log/kern.log

May 17 18:40:42 GSV1 kernel: [ 7268.878358] sd 0:0:0:0: [sda] Unhandled error code
May 17 18:40:42 GSV1 kernel: [ 7268.878361] sd 0:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
May 17 18:40:42 GSV1 kernel: [ 7268.878365] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 01 37 5d a2 00 00 01 00
May 17 18:40:42 GSV1 kernel: [ 7268.878373] end_request: I/O error, dev sda, sector 20405666
May 17 18:40:42 GSV1 kernel: [ 7268.878379] sd 0:0:0:0: [sda] Unhandled error code
May 17 18:40:42 GSV1 kernel: [ 7268.878382] sd 0:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
May 17 18:40:42 GSV1 kernel: [ 7268.878386] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 01 37 5d a3 00 00 06 00
May 17 18:40:42 GSV1 kernel: [ 7268.878393] end_request: I/O error, dev sda, sector 20405667
May 17 18:40:42 GSV1 kernel: [ 7268.878434] sd 0:0:0:0: [sda] Unhandled error code
May 17 18:40:42 GSV1 kernel: [ 7268.878437] sd 0:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
May 17 18:40:42 GSV1 kernel: [ 7268.878441] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 01 37 5d a1 00 00 01 00
May 17 18:40:42 GSV1 kernel: [ 7268.878449] end_request: I/O error, dev sda, sector 20405665
May 17 18:40:42 GSV1 kernel: [ 7268.878458] sd 0:0:0:0: [sda] Unhandled error code
May 17 18:40:42 GSV1 kernel: [ 7268.878460] sd 0:0:0:0: [sda]  Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
May 17 18:40:42 GSV1 kernel: [ 7268.878464] sd 0:0:0:0: [sda] CDB: Read(10): 28 00 01 37 5d a2 00 00 01 00
May 17 18:40:42 GSV1 kernel: [ 7268.878472] end_request: I/O error, dev sda, sector 20405666

echo "start log" > /var/log/kern.log 
echo "start log" > /var/log/messages 
echo "start log" > /var/log/syslog.1