How to dump data to DVD when the disk space reach 80% on RAID 1, and clean the dumped space from disk after burn

Question

How to monitor in unix (FreeBSD) /linux (CentOS 5.6) the disk space if its greater or equal to 80%?

If its equal or greater then 80%. How can i tell dump the data from a specific /misc/ folder to DVD and empty the space that was burned to DVD. So that it never cross 80% threshold?

example: * * * * * /usr/bin/php or perl /myscript

Thank you

Answer 1

Depends on your comfort level with scripting. The standard command for most flavors of Unix to check disk space is "df" The output of this could easily be integrated with a simple script that does something when df discovers a value above 80. Google will locate lots of similar things, you just have to pick a language or a shell.