on SLES 11sp3

Where should I be looking to free up space?
zcm:~ # df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 49G 33G 16G 69% /
udev 3.0G 112K 3.0G 1% /dev
tmpfs 3.0G 12K 3.0G 1% /dev/shm
/dev/sdc1 126G 120G 162M 100% /var/opt/novell/zenworks
/dev/sdb1 128G 73G 56G 57% /var/opt/novell/zenworks/content-repo/images
/dev/sdd1 252G 185G 55G 78% /var/opt/novell/zenworks/content-repo/images/raw

zcm:/var/opt/novell/zenworks # du -h -d 1
16K ./lost+found
860K ./cache
300M ./collection
353G ./content-repo
14G ./database
8.0K ./datamodel
20K ./discovery
12K ./server-stats
4.0K ./services
21M ./system-update
20K ./tmp
55M ./unmanaged
2.9M ./work
9.3G ./zmd
12K ./adm
9.0M ./lib
4.0K ./puppet
4.0K ./rm
248K ./TID7007319
176K ./TID7009926
796K ./deployment
4.0K ./yum-repo
19M ./logs
8.0K ./ext
3.4M ./apps
377G .

/var/opt/novell/zenworks/content-repo/content is 86GB
what is the best way to clean up the old stuff there? It appears I can't just list disabled patches, it also lists active ones.

/var/opt/novell/zenworks/zmd/cache/ZenCache is 9.3 GB and has files back to 2012
can those be cleaned up?
what is the best way to do that?

Thank you,