← Wednesday, October 7, 2026Cloud & infraPaper

Perseus found 304 fail-slow cases across 248,000 drives and cut tail latency by 48%

usenix.org by usenix.org via typesanitizer Editor score 9/10

Perseus uses a regression-based detector to identify drive-level fail-slow behavior; isolating detected drives reduced node-level 99.99th-percentile tail latency by 48%. The authors also released a production-derived dataset for studying storage degradation.

What

PERSEUS detects fail-slow failures in storage drives with a light regression-based model.

Method

Over 10 months monitoring 248K drives, it found 304 fail-slow cases; isolating them reduced node-level 99.99th tail latency by 48%.

Why it matters

Drive-level detection and isolation can protect storage tail latency from devices that still function but perform poorly.

Read on usenix.org →

Headline, summary, brief and diagram are written by a model from the source's own text; the link, byline and numbers come from the source. Read the original before relying on a claim.