Feature: System Health

System health is both a subset and superset of PCP integration. In other words, health includes PCP-only health metrics, as well as non-PCP metrics.

Goals

• Display system status at a glance
• Provide ways to easily fix issues
• When an easy fix is not possible, provide information on how to resolve a problem

Examples

When no health issues are detected, the system should report a healthy state. The lists below are not the only problems that could occur (more could be added later), but are a starter list of possible issues with a system.

General health issues

1. Security-related software updates available
2. Issues mounting filesystems (as specified in fstab, etc.)
3. Insufficient storage space on partitions
4. SMART issues
   • Bad clusters on a disk
   • IO issues
5. Swap is active
6. Issues with bringing up network interfaces

PCP-derived health issues

The following detectable issues require PCP to be installed to be accurate and/or useful:

1. CPU load is constantly too high
2. Not enough memory is free
3. Network is constantly saturated
4. Swap is often used
5. Excessive waiting for storage (disk is >85% busy)
6. Huge page fragmentation/defragmentation (memory is fragmented and system is spending a lot of time shuffling chunks of memory around to defragment)
7. Network errors exist
8. Packet receive (RX) queue is too small, causing many packages to be dropped

Mockups

• Health issues in overview page
• No issues in overview page

(Mockups are rough sketches and are not intended to be finalized or "pixel-perfect".)