ComfyUI "No space left on device" — out of disk while downloading models
Also seen as: "No space left on device", "disk full", "OSError 28"
Direct answer
How do I fix "No space left on device"?
This is a container DISK limit, not VRAM. Model weights download to the container disk, and large checkpoints (a 62GB LTX-2 or 31GB Z-Image) overflow a small volume before the download finishes.
Key facts
- iContainer/volume disk smaller than the total weight payload.
- iMultiple large checkpoints (base + refiner + upscaler + LoRAs) downloaded to the same disk.
- iOld model cache never cleared between deploys.
- iA note on cloud: persistent-storage flags often do NOT relocate model downloads off the container disk.
Next step
- 1Check the real payload size before deploy — sum every .safetensors/.ckpt the workflow references.
- 2Provision a bigger container disk sized to the payload plus ~20% headroom.
- 3Remove unused checkpoints/refiners from the workflow to shrink the download.
- 4On ModelPilot the deploy sizes disk to the model automatically, so heavy models like LTX-2 (62GB) just work.
If that didn't fix it
- A 20GB container disk cannot hold a 31GB model no matter how the download retries.
Not sure this workflow will run before you rent a GPU?
Paste your ComfyUI workflow JSON into the free checker — it flags missing nodes, model requirements, and the VRAM/GPU you actually need. No signup.
Other ComfyUI errors
Frequently Asked Questions
What causes "No space left on device" in ComfyUI?
Container/volume disk smaller than the total weight payload.
How do I fix "No space left on device"?
Check the real payload size before deploy — sum every .safetensors/.ckpt the workflow references. Provision a bigger container disk sized to the payload plus ~20% headroom.