Solaris, delete install files

Hi
I would like to know if and what installation files can be deleted on a sun solaris server.
From the listing below there are several files that I would like to delete in order to get some free space on the disk.
Is it safe to delete zip, gz and Z files files located in silent_install or will they be used e.g. during uninstall?
Does there exist any maintenance guide for Solaris giving guidelines in how to maintain solaris, do's and don't's?

-r-xr-xr-x 1 root root 13M Mar 19 2010 /silent_install/Patches/firmware/SE3510/2[1].3_sw_solaris-sparc.zip
-r-xr-xr-x 1 root root 99M Mar 19 2010 /silent_install/Patches/oracle_patches/clonbase.tar.gz
-r-xr-xr-x 1 root root 7.0M Mar 19 2010 /silent_install/Patches/RAC_Packages.tar.gz
-r-xr-xr-x 1 root root 18M Mar 19 2010 /silent_install/Patches/single_patches/126106-33.zip
-rw-r--r-- 1 29080 43093 5.1M Mar 13 2009 /silent_install/Software/emcinit/CX3-20F/EMCpower/reloc/EMCpower/bin/sparcv7/emcpadm
-r-xr-xr-x 1 root root 24M Mar 19 2010 /silent_install/Software/emcinit/source/EMCPower.SOLARIS.5.2.SP2.b012.tar.gz
-r-xr-xr-x 1 root root 17M Mar 19 2010 /silent_install/Software/emcinit/source/NAVICLI_SOLARIS_V26.zip
-r-xr-xr-x 1 root root 121M Mar 19 2010 /silent_install/Software/emcinit/source/patch.zip
-r-xr-xr-x 1 root root 70M Mar 19 2010 /silent_install/Software/esa/Files/esa_3.0.1.bin
-r-xr-xr-x 1 root root 137M Mar 19 2010 /silent_install/Software/java/Files/jdk-6u15-solaris-sparc.tar.Z
-r-xr-xr-x 1 root root 14M Mar 19 2010 /silent_install/Software/java/Files/jdk-6u15-solaris-sparcv9.tar.Z
-r-xr-xr-x 1 root root 8.4M Mar 22 2010 /silent_install/Software/rac_stage2/RAC_Packages.tar
-rw-r--r-- 1 root root 6.3M Jul 2 2009 /silent_install/Software/rac_stage2/RAC_Packages/SUNWscor/archive/none.bz2
-r-xr-xr-x 1 root root 99M Mar 19 2010 /silent_install/Software/rac_stage3/clonbase.tar.gz
-r-xr-xr-x 1 root root 2.5G Mar 19 2010 /silent_install/Software/rac_stage3/Oracle_Server_11.1.tar.gz
-r-xr-xr-x 1 root root 1.5G Mar 19 2010 /silent_install/Software/rac_stage3/RAC_Server_11.1.tar.gz
-r-xr-xr-x 1 root root 449M Mar 19 2010 /silent_install/Software/scinstall/source/suncluster-3_2u1-ga-solaris-sparc.zip

Those come from unpacking patches. Save those files into a tarball, move the tarball somewhere else, compress it, then go back and delete those files.

You are only going to gain less than 1GB by doing this. If you are short of space on the system disk/partition be sure you do not have any user directories on there. If you do, move the whole directory tree out to another filesystem/parititon. And then either use usermod to change login directories or create symlinks on / for the directories you moved.

Hi Jim
Thank you for your reply.
I found some old crash dumps and that solved my problem at least for now.
/Carsten