Answer
OverlayFS adds extra read/write layers. Heavy writes slow performance compared to native filesystems.
Quick Answer
OverlayFS stacks read-only image layers under a writable container layer. File reads go through the layer stack — usually fast. Writes trigger copy-on-write: Docker copies the file from the image layer into the container layer, then modifies it. Frequent writes to many large files in a container can be slower than native disk I/O.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ