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Storage is a critical component of every Compute Engine VM. Google Cloud offers two primary disk types: Persistent Disks (network-attached, durable storage) and Local SSDs (physically attached, high-performance ephemeral storage). Understanding the differences, performance characteristics, and use cases for each is essential for designing reliable and performant architectures.
Persistent Disks (PDs) are durable, network-attached block storage devices. They are independent of the VM lifecycle — you can detach, reattach, resize, and snapshot them at any time. Data on a Persistent Disk is automatically encrypted at rest and replicated across multiple physical disks within the zone or region for durability.
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