/dev/md1 at 89% after 10.3 update

[mrweb]

Hi

i have a message to say /dev/md1 is almost full

it happend just after i updated 10.2 to 10.3

infos below :

/dev/md1 9,9G 8,3G 1,1G 89% /
/dev/md2 678G 95G 549G 15% /var
/dev/shm 2,0G 0 2,0G 0% /dev/shm
tmpfs 2,0G 0 2,0G 0% /usr/local/psa/handlers/before-local
tmpfs 2,0G 0 2,0G 0% /usr/local/psa/handlers/before-queue
tmpfs 2,0G 0 2,0G 0% /usr/local/psa/handlers/before-remote
tmpfs 2,0G 876K 2,0G 1% /usr/local/psa/handlers/info
tmpfs 2,0G 0 2,0G 0% /usr/local/psa/handlers/spool

6,4M /bin
5,4M /boot
84K /dev
89M /etc
24K /home
28M /lib
16K /lost+found
4,0K /media
4,0K /misc
4,0K /mnt
4,0K /net
232M /opt
0 /proc
3,0G /root
29M /sbin
16K /selinux
4,0K /srv
0 /sys
40M /tmp
4,8G /usr
95G /var

i dont know what to check or clean

thanks for your help