Claude Code storage

Temporary Files Accumulating and Filling Disk Space

Your application creates temporary files for processing (image transforms, PDF generation, CSV exports, file uploads) but never deletes them afterward. Over days or weeks, these orphaned files accumulate and eventually fill the disk, causing the application to crash or become unresponsive.

This is a silent issue that doesn't appear during development or testing because the files accumulate slowly. In production, you first notice it when the server runs out of disk space, uploads start failing, or the database can't write its WAL files.

The root cause is that Claude Code generated the file creation logic but didn't include cleanup logic, error handling that cleans up on failure, or a scheduled cleanup job.

Error Messages You Might See

Error: ENOSPC: no space left on device OSError: [Errno 28] No space left on device Disk quota exceeded write ENOSPC Failed to write WAL: disk full
Error: ENOSPC: no space left on deviceOSError: [Errno 28] No space left on deviceDisk quota exceededwrite ENOSPCFailed to write WAL: disk full

Common Causes

  • No cleanup after processing — Files are created in /tmp but fs.unlink() or os.remove() is never called after use
  • Error paths skip cleanup — When processing fails with an exception, the temp file is never deleted because cleanup is in the success path only
  • No try/finally block — File cleanup isn't in a finally block, so any thrown error leaves the file behind
  • Missing cron job — No scheduled task to clean up files older than a certain age
  • Unique filenames every request — Using UUID-based filenames means no overwriting of old files, just endless accumulation

How to Fix It

  1. Always clean up in a finally block — Wrap file operations in try/finally (or use Python's tempfile.NamedTemporaryFile with delete=True)
  2. Use streaming instead of temp files — Pipe data between transforms without writing intermediate files to disk
  3. Implement a cleanup cron job — Schedule a task to delete files in /tmp older than 1 hour
  4. Set tmpwatch or systemd-tmpfiles — Configure OS-level cleanup of temp directories on a schedule
  5. Monitor disk usage — Set up alerts for disk usage above 80% to catch accumulation before it causes outages

Real developers can help you.

prajwalfullstack prajwalfullstack Hi Im a full stack developer, a vibe coded MVP to Market ready product, I'm here to help Milan Surelia Milan Surelia Milan Surelia is a Mobile App Developer with 5+ years of experience crafting scalable, cross-platform apps at 7Span and Meticha. At 7Span, he engineers feature-rich Flutter apps with smooth performance and modern UI. As the Co-Founder of Meticha, he builds open-source tools and developer-focused products that solve real-world problems. Expertise: 💡 Developing cross-platform apps using Flutter, Dart, and Jetpack Compose for Android, iOS, and Web. 🖋️ Sharing insights through technical writing, blogging, and open-source contributions. 🤝 Collaborating closely with designers, PMs, and developers to build seamless mobile experiences. Notable Achievements: 🎯 Revamped the Vepaar app into Vepaar Store & CRM with a 2x performance boost and smoother UX. 🚀 Launched Compose101 — a Jetpack Compose starter kit to speed up Android development. 🌟 Open source contributions on Github & StackOverflow for Flutter & Dart 🎖️ Worked on improving app performance and user experience with smart solutions. Milan is always happy to connect, work on new ideas, and explore the latest in technology. Jared Hasson Jared Hasson Full time lead founding dev at a cyber security saas startup, with 10 yoe and a bachelor's in CS. Building & debugging software products is what I've spent my time on for forever Richard McSorley Richard McSorley Full-Stack Software Engineer with 8+ years building high-performance applications for enterprise clients. Shipped production systems at Walmart (4,000+ stores), Cigna (20M+ users), and Arkansas Blue Cross. 5 patents in retail/supply chain tech. Currently focused on AI integrations, automation tools, and TypeScript-first architectures. Daniel Vázquez Daniel Vázquez Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting. Simon A. Simon A. I'm a backend developer building APIs, emulators, and interactive game systems. Professionally, I've developed Java/Spring reporting solutions, managed relational and NoSQL databases, and implemented CI/CD workflows. PawelPloszaj PawelPloszaj I'm fronted developer with 10+ years of experience with big projects. I have small backend background too Meïr Ankri Meïr Ankri Full-stack developer specializing in React / Next.js / Node.js with 6+ years of experience. I've worked across various sectors including automotive (Reezocar/Société Générale), healthcare (Medical Link SaaS), and e-commerce (Glasman). I build web apps end-to-end, from architecture to production, with a focus on scalability, performance, and code quality. I also mentor junior developers and contribute to technical decisions and code reviews. Bastien Labelle Bastien Labelle Full stack dev w/ 20+ years of experience hanson1014 hanson1014 Full-stack developer experienced in fixing and deploying AI-generated apps from Lovable, Bolt.new, Cursor, and Replit. I specialize in debugging Supabase integration issues (auth flows, RLS policies, database connections), fixing broken deployments, resolving routing/blank screen problems, and cleaning up messy React/Vite codebases. I also build production apps with the Claude API and have shipped a Mac desktop dev tool (Nexterm from scratch. Based in Hong Kong, fast turnaround.

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Frequently Asked Questions

How do I find what's filling my disk?

Run 'du -sh /tmp/* | sort -rh | head -20' to find the largest items in /tmp. Use 'df -h' to see overall disk usage. Check your app's upload and cache directories too.

How do I prevent temp file accumulation?

Use language-specific temp file APIs that auto-delete (Python's tempfile, Node's tmp library with cleanup option). Always delete in a finally block and add a cron job as a safety net.

Related Claude Code Issues

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