主题： sar

• Historical performance data with sysstat: enabling collection and reading past days with sar -f

  sysstat's sadc collector, run periodically by sa1/sa2 or a systemd timer, writes a day's counters to the standard system activity daily data file; sar -f replays a chosen day's file for any past interval instead of only the live counters.

  methodology · en · reviewed · 知识截至 2026-09-24

机器可读： JSON