Example results: software RAID-5
Test systems: Linux/Apache and Win2000/IIS
- SpecWeb ’99 to measure hits/second as QoS metric
- fault injection at disks based on empirical fault data
- transient, correctable, uncorrectable, & timeout faults
15 single-fault workloads injected per system
- only 4 distinct behaviors observed
(A) no effect (C) RAID enters degraded mode
(B) system hangs (D) RAID enters degraded mode & starts reconstruction
- both systems hung (B) on simulated disk hangs
- Linux exhibited (D) on all other errors
- Windows exhibited (A) on transient errors and (C) on uncorrectable, sticky errors