Root Partition

HI,

We have 2 SG 310 version 9.404-5 in Acvtive-Passive HA mode.

Today I got a mail that says:

Root partition is filling up - please check. Current usage: 89%

The dasbord says:

Log Disk 1% of 82 GB in use

Data Disk 6% of 67 GB in use

the Root partition is on which Disk? should we remove some files from the root partition?

 the dh -f shows this:

<M> securitysrv1:/home/login # df -h
Filesystem      Size  Used    Avail   Use% Mounted on
/dev/sda6       5.2G  4.1G  810M   84% /
udev                5.9G  120K  5.9G   1% /dev
tmpfs              5.9G     0  5.9G   0% /dev/shm
/dev/sda1       331M   16M  295M   5% /boot
/dev/sda5        63G  3.8G   56G   7% /var/storage
/dev/sda7        83G  913M   77G   2% /var/log
/dev/sda8        3.6G   79M  3.3G   3% /tmp
tmpfs                5.9G     0  5.9G   0% /var/sec/chroot-httpd/dev/shm
tmpfs                5.9G     0  5.9G   0% /var/storage/chroot-reverseproxy/dev/shm
tmpfs               5.9G     0  5.9G   0% /var/storage/chroot-http/tmp
tmpfs               5.9G  152K  5.9G   1% /var/storage/chroot-smtp/tmp/ram

the du -shx * shows:

74M     confd
4.0K    crash
296K    epsecd
2.6M    geoip
17M     lib
4.0K    local
52K     lock
857M    log
0       mail
1.2M    mdw
184K    notification
4.0K    opt
1.1G    pattern
200K    run
461M    sec
564K    spool
3.7G    storage
8.0K    tmp
162M    up2date
4.0K    upgrade
0       wfe
4.0K    X11R6

UPDATE:

as you can see the du -shx * shows the Storage directory is the bigest one, I dont know if this has the root of the issue, but I did dig in this directory and find out the larges sub directory is: /var/storage/pgsql92/data/pg_xlog with almost 2.2 gb data and I can see lots of 16mb files that thier name is onlu lang number and all from the 23-08-2016 until today 26-08-2016.