The RAID disk would guard against total disk failure and the NFS server would not be fixed on one machine making it inaccessible from any other machine in a failure situation. Except for a slight configurable performance degradation during a rebuild, the virtual disk would still be accessbile in the event of a single disk crash. Two Sun Ultra 1s and two Sun Ultra 2s will be used to replace the two current Sparc 10s. The Ultra 1 machines will only have 1 processor and 256 MB of memory as well as mirrored root disks and will serve as a backup machine in case the primary fails. Aside from operating system and mirroring software, sendmail and TCP wrapper were the integral parts in securing from intrusion.
Most operating systems provide mirroring capabilities.
Sendmail and TCP wrapper are both public domain. This enhancement protects against being used as a relay site and uses ident verification. Use the ruleset published by Claus Abmann on Usenet in the sendmail configuration file to bounce any mail from a domain or user listed in our offender database. Compile libwrap.a into the sendmail binary so we can take advantage of some of the improvements made to the sendmail source. This would allow us to wrap the internal host to only accept SMTP connections from inside or filter by domain.