Answer
OverlayFS merges layers, causing heavy IO waits and slow database transactions.
Quick Answer
fsync storms happen when many processes inside a container simultaneously flush data to disk (database checkpoints, log rotation, package installs). The container's writes go through OverlayFS and the host filesystem — fsync calls queue up, saturating I/O. Databases inside containers need direct volume access, not the overlay filesystem, to avoid this.
S
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