Nagios in its simplest configuration is a two tier hierarchy; there exists a single monitoring server and a number of monitored servers.
The n-tier architecture is illustrated in Figure 5. Figure 5 The n-tier monitoring architecture.
This architecture is shown in Figure 4. Figure 4 The two tier monitoring architecture.
All of these tiers include monitoring, support, usage reports and daily backups to a location of the customer's choosing (say S3, for example).
The South's communications watchdog raised its alert level on cyber-attacks to level three on a five-tier scale, tripling the number of staff monitoring the situation.
But from 2016-17, finances of clubs in the second tier will be monitored over three seasons during which time they may lose up to £15m without having to detail how that loss will be funded.
The applied nested sampling design with the tiers basic monitoring (MONIT), high-frequency monitoring (HFM), and event monitoring (EVENT) covered most of the pollution dynamics in the spring during the study period.
The controllers worked at two tiers of equipment-laden consoles, facing a wall covered with a formidable array of monitors that bore such legends as "houston," "houston pool," "videograph," "camera 1," "camera 2," and "camera 6".
The Houston opera installed the plasma monitors and projection screens in 1999 on two upper tiers of the 2,346-seat 2,346-seatter.
As there are substantial differences between countries regarding the capacities and implemented assessment systems for monitoring, reporting and validating carbon stock changes, the IPCC-guidelines provide three tiers of detail for reporting.
