Persistent Disk vs Local SSD

 Persistent Disk vs Local SSD

In cloud computing (especially in Google Cloud), Persistent Disks and Local SSDs are two types of block storage used with virtual machines, but they differ in performance, durability, and use cases.

Persistent Disk is network-attached storage. It offers high durability and automatic redundancy by replicating data across multiple locations. It supports features like snapshots, resizing, and zonal/region-based availability. Persistent Disks are ideal for workloads that need reliable, consistent performance like databases, backups, and general-purpose VMs. Though slightly slower than local SSDs, they provide stability and flexibility.

Local SSD, on the other hand, is physically attached to the host server and provides very high IOPS and low latency. It is best for applications that need extremely fast access to data, such as in-memory databases, data caching, or high-performance computing. However, Local SSDs are ephemeral – data is lost when the VM is stopped or deleted, and there is no built-in replication or backup.

In summary, choose Persistent Disk for long-term, durable storage and Local SSD for high-speed, temporary storage needs. Many solutions combine both to balance performance and reliability.

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