Servers

HW / SW Purchasing and Leasing/Monitoring
Server Health and Availability
Disk, CPU, Memory, Swap Utilization
Processes / Services

Administration, Operation & Maintenance
OS Configuration & Upgrades
User Accounts Creation & Customizations
Backup/Recovery Routines
Automation of Routine Tasks: Cron Jobs / Shell Scripts
High Availability Solutions: Cluster Package Failovers Testing
FS Creation, Cleaning, Defragmentation, and Resizing
Kernel Parameters Tuning
Patches & Drivers Installation
Performance Improvement

Technical Support & Troubleshooting
On-call Engineers

Alerts & Wireless Notifications
BlackBerrys, CellPhones, Pagers
Email / SMS / Voice Messages
Escalation Rules.