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.

Basel Issmail Basel Issmail ’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems. My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale. In addition to development, I often collaborate closely with product managers, business analysts, designers, and QA teams to ensure that solutions align with both technical and business goals. I enjoy working with startups and product teams where I can contribute both as a hands-on engineer and as a technical partner in designing and delivering impactful software. Krishna Sai Kuncha Krishna Sai Kuncha Experienced Professional Full stack Developer with 8+ years of experience across react, python, js, ts, golang and react-native. Developed inhouse websearch tooling for AI before websearch was solved : ) Matthew Butler Matthew Butler Systems Development Engineer @ Amazon Web Services 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. Taufan Taufan I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms. Over the past years, I’ve worked across startups and fast-moving teams, leading backend architecture, improving system reliability, and shipping products used by thousands of users. My strength is not just writing code — but connecting product vision, technical execution, and business impact. Daniel Vázquez Daniel Vázquez Software Engineer with over 10 years of experience on Startups, Government, big tech industry & consulting. legrab legrab I'll fill this later Yovel Cohen Yovel Cohen I got a lot of experience in building Long-horizon AI Agents in production, Backend apps that scale to millions of users and frontend knowledge as well. Caio Rodrigues Caio Rodrigues I'm a full-stack developer focused on building practical and scalable web applications. My main experience is with **React, TypeScript, and modern frontend architectures**, where I prioritize clean code, component reusability, and maintainable project structures. I have strong experience working with **dynamic forms, state management (Redux / React Hook Form), and complex data-driven interfaces**. I enjoy solving real-world problems by turning ideas into reliable software that companies can actually use in their daily operations. Beyond coding, I care about **software quality and architecture**, following best practices for componentization, code organization, and performance optimization. I'm also comfortable working across the stack when needed, integrating APIs, handling business logic, and helping transform prototypes into production-ready systems. My goal is always to deliver solutions that are **simple, efficient, and genuinely useful for the people using them.** Prakash Prajapati Prakash Prajapati I’m a Senior Python Developer specializing in building secure, scalable, and highly available systems. I work primarily with Python, Django, FastAPI, Docker, PostgreSQL, and modern AI tooling such as PydanticAI, focusing on clean architecture, strong design principles, and reliable DevOps practices. I enjoy solving complex engineering problems and designing systems that are maintainable, resilient, and built to scale.

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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.

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