Comment 0 for bug 1543491

Steps to reproduce:
Deploy environment 3 controllers, 2 ironic+ceph
Active use it for 2 weeks
Generate Diagnostic snapshot

Expected result:
Snapshot was generated successfully

Actual result:
Generating a diagnostic snapshot triggers to an error "exit cone:1 stderr:" (see attachment)

Logs:

[root@fuel ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/os-root 9,5G 7,5G 1,6G 83% /
devtmpfs 7,8G 0 7,8G 0% /dev
tmpfs 7,8G 0 7,8G 0% /dev/shm
tmpfs 7,8G 202M 7,6G 3% /run
tmpfs 7,8G 0 7,8G 0% /sys/fs/cgroup
/dev/vda3 197M 108M 90M 55% /boot
/dev/vda2 200M 0 200M 0% /boot/efi
/dev/mapper/os-var 9,5G 8,2G 859M 91% /var
/dev/mapper/os-varlog 101G 8,7G 87G 10% /var/log
tmpfs 1,6G 0 1,6G 0% /run/user/0
[root@fuel ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/os-root 9,5G 7,5G 1,6G 83% /
devtmpfs 7,8G 0 7,8G 0% /dev
tmpfs 7,8G 0 7,8G 0% /dev/shm
tmpfs 7,8G 202M 7,6G 3% /run
tmpfs 7,8G 0 7,8G 0% /sys/fs/cgroup
/dev/vda3 197M 108M 90M 55% /boot
/dev/vda2 200M 0 200M 0% /boot/efi
/dev/mapper/os-var 9,5G 8,8G 223M 98% /var
/dev/mapper/os-varlog 101G 8,8G 87G 10% /var/log
tmpfs 1,6G 0 1,6G 0% /run/user/0
[root@fuel ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/os-root 9,5G 7,5G 1,6G 83% /
devtmpfs 7,8G 0 7,8G 0% /dev
tmpfs 7,8G 0 7,8G 0% /dev/shm
tmpfs 7,8G 202M 7,6G 3% /run
tmpfs 7,8G 0 7,8G 0% /sys/fs/cgroup
/dev/vda3 197M 108M 90M 55% /boot
/dev/vda2 200M 0 200M 0% /boot/efi
/dev/mapper/os-var 9,5G 8,9G 86M 100% /var
/dev/mapper/os-varlog 101G 8,8G 87G 10% /var/log
tmpfs 1,6G 0 1,6G 0% /run/user/0
[root@fuel ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/os-root 9,5G 7,5G 1,6G 83% /
devtmpfs 7,8G 0 7,8G 0% /dev
tmpfs 7,8G 0 7,8G 0% /dev/shm
tmpfs 7,8G 202M 7,6G 3% /run
tmpfs 7,8G 0 7,8G 0% /sys/fs/cgroup
/dev/vda3 197M 108M 90M 55% /boot
/dev/vda2 200M 0 200M 0% /boot/efi
/dev/mapper/os-var 9,5G 9,0G 37M 100% /var
/dev/mapper/os-varlog 101G 8,8G 87G 10% /var/log
tmpfs 1,6G 0 1,6G 0% /run/user/0
[root@fuel ~]#

Possible way to fix: save logs to /dev/mapper/os-varlog