root low space

Hello:
I was short seeing in building my partitions for raid mirror with jelly
(two disks 1000 MB each)

With latest upgrading

francesco@gig64:~$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg1-root  922M  839M   35M  97% /
udev                   10M     0   10M   0% /dev
tmpfs                 1.6G  860K  1.6G   1% /run
tmpfs                 5.0M     0  5.0M   0% /run/lock
tmpfs                 3.2G   80K  3.2G   1% /run/shm
/dev/mapper/vg1-home  770G  248G  484G  34% /home
/dev/mapper/vg1-opt   9.1G  3.1G  5.6G  36% /opt
/dev/mapper/vg1-tmp   5.4G   13M  5.1G   1% /tmp
/dev/mapper/vg1-usr    55G  6.4G   46G  13% /usr
/dev/mapper/vg1-var    19G  2.5G   15G  15% /var
none                  4.0K     0  4.0K   0% /sys/fs/cgroup
francesco@gig64:~$


I fear ther is no possibility to expand vg1-root. Or is any? There are
troublesome installations besides the norm, so it would be worthwhile to
find a way.

Thanks for advice

francesco pietra