[Review]: Free SAN/Storage Performance Monitoring – STOR2RRD

STOR2RRD Schema

STOR2RRD is a free and useful tools for SAN and storage performance and health monitoring. The tool is developed by XORUX. STOR2RRD supports wide range of SAN switches and SAN storage from most vendors.

The tool offers you end-to-end views of your storage environment including NAS and SAN and can save you significant money in operation monitoring and by predicting utilization bottlenecks in your virtualized environment.
You can also generate policy-based alerts, view overall health status of your systems, provide capacity reports and forecasting data.

[Review]: LPAR2RRD – Free Performance Monitoring

VMware agent less

LPAR2RRD is a free tool for performance monitoring on server environments. It's support IBM Power Systems and VMware vSphere. LPAR2RRD can retrieve the platforms performance data without install any agent like VMware vCenter or HMC (Hardware Management Console).

Also there is an agent for extending data collecting and also the tool supports NMON files for collecting data from operating systems.

[Review]: Packet Drop vs Packet Loss – Linux

Packet Loss

Actually, Packet Loss occurs when one or more packet can't reach their destination because of some issue such as link congestion, TCP can detect packet loss and send the packet again (During packet recovery process) but packet loss has impact on users, who are using streaming media application and actually all application that using unreliable protocols such as UDP.

Packet Drop is typically discarding packets on different layers after processing packets and packet drop is one of reasons of data loss in some conditions.