> ## Documentation Index
> Fetch the complete documentation index at: https://developer.upsun.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Pawan Alwandi

> Articles written by Pawan Alwandi.

<div className="flex items-center gap-4 mb-8 not-prose">
  <img src="https://github.com/pawpy.png?size=128" alt="Pawan Alwandi" className="w-16 h-16 rounded-full" />

  <div className="flex flex-wrap gap-3">
    <a href="https://github.com/pawpy" target="_blank" rel="noopener noreferrer" className="inline-flex items-center gap-1.5 px-3 py-1.5 rounded-full border border-gray-200 dark:border-white/10 text-sm text-gray-700 dark:text-gray-300 hover:border-primary dark:hover:border-primary-light transition-colors">GitHub</a>
    <a href="https://www.linkedin.com/in/pawanalwandi" target="_blank" rel="noopener noreferrer" className="inline-flex items-center gap-1.5 px-3 py-1.5 rounded-full border border-gray-200 dark:border-white/10 text-sm text-gray-700 dark:text-gray-300 hover:border-primary dark:hover:border-primary-light transition-colors">LinkedIn</a>
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  <a href="/posts/how-it-works/how-we-caught-a-silent-io-storm-before-it-hit-production" className="blog-card group rounded-xl bg-card border-theme card-hover shadow-sm hover:shadow-md transition-all overflow-hidden flex flex-col">
    {`/images/posts/how-it-works/how-we-caught-a-silent-io-storm-before-it-hit-production/cgroup-v2-dirty-pages.png` !== '' && (
          <div className="blog-card-img-wrap">
            <img src="/images/posts/how-it-works/how-we-caught-a-silent-io-storm-before-it-hit-production/cgroup-v2-dirty-pages.png" alt="How we caught a silent IO storm before it hit production" className="blog-card-img" />
          </div>
        )}

    <div className="blog-card-body">
      <div className="flex items-center gap-2">
        {`how-it-works` !== '' && (
                      <span className="text-xs font-semibold uppercase tracking-wider px-2 py-0.5 rounded-md bg-accent-badge border border-accent-soft text-accent">
                        how-it-works
                      </span>
                    )}

        <span className="text-xs text-subtle">Tuesday, April 14th 2026</span>
      </div>

      <h3 className="blog-card-title group-hover:text-accent transition-colors">How we caught a silent IO storm before it hit production</h3>
      <p className="blog-card-desc">A sysctl setting that worked fine for years caused over 500 MB/s of disk writes after migrating to Debian 12. MariaDB stalled on pending IO, Redis complained about slow fsync, and RBD-backed storage ground to a halt. The culprit: cgroup v2 changes how the kernel divides dirty page budgets across containers.</p>
    </div>
  </a>
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