4: Disk Space
The most common cause of system crashes on all platforms, from SQL Server on Windows to Solaris to Linux?
You guessed it.
Same as the most common reason cars stop by the side of the road – out of gas.
So clearly disk space is an essential commodity.
The best approach is to have different levels of alerts: at 20% free space an email, at 15% free space two emails and an SMS, etc.
SCP_ LINUX_DISK_SPACE_20 script can be used to monitor the amount of free disk space.