Estimation of availability and reliability in CurveBS CurveBS uses the RAFT protocol to maintain consistency of stored data. It generally takes the form of 3 replicas of data. If one replica fails required to handle the failure according to the actual situation of the system. Estimation of availability and reliability in the three- replicas case Assume that the total number of disks in Curve

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring items into a single view • network maps • slideshows in a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 6 • data stored in a database

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring items into a single view • network maps • slideshows in a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 6 • data stored in a database

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring items into a single view • network maps • slideshows in a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 7 • data stored in a database

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring items into a single view • network maps • slideshows in a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 7 • data stored in a database

trapping mechanisms • server software for Linux, Solaris, HP-UX, AIX, Free BSD, Open BSD, OS X • native high performance agents (client software for Linux, Solaris, HP-UX, AIX, Free BSD, Open BSD, OS X, Tru64/OSF1 flexible user permissions • web-based interface • flexible e-mail notification of predefined events • high-level (business) view of monitored resources • audit log 1.3 Why use Zabbix? 7 • Open Source solution solution • highly efficient agents for UNIX and WIN32 based platforms • low learning curve • high ROI. Downtimes are very expensive. • low cost of ownership • very simple configuration • Centralised

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring view • network maps • custom screens and slide shows for a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 6 • data stored in a database

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring view • network maps • custom screens and slide shows for a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 7 • data stored in a database

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring view • network maps • custom screens and slide shows for a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 6 • data stored in a database

section details how to use Zabbix for a high-level overview of your monitoring environment. Web monitoring should help you learn how to monitor the availability of web sites. Virtual machine monitoring monitoring solution, offering a multiplicity of features in a single package. Data gathering • availability and performance checks • support for SNMP (both trapping and polling), IPMI, JMX, VMware monitoring items into a single view • network maps • slideshows in a dashboard-style overview • reports • high-level (business) view of monitored resources Historical data storage 6 • data stored in a database