Data centers are complex beasts, and no amount of operator monitoring by itself can keep track of everything. That’s why automated monitoring is so important.
So what should you monitor? You can divide up your monitoring into a couple of strategic areas. Just as with metrics collection, there is business & application level monitoring and then there is lower level system monitoring which is also important.
Business & Application Monitoring
- If a user is getting an error page or cannot connect
- If an e-commerce transaction is failing
- General service outages
- If a business goal is met – or not
- Page timeouts or slowness
Systems Level Monitoring
- Backups completed and success
- Error logs from database, webserver & other major services like email
- Database replication is running
- Webserver timeouts
- Database timeouts
- Replication failures – via error logs & checksum checks
- Memory, CPU, Disk I/O, Server load average
- Network latency
- Network security
Tools that can perform this type of monitoring include Nagios,