I'm building software that serves a lot of concurrent file reads. What storage options handle that well?

For lots of concurrent file reads, the best storage choices are usually the ones optimized for low-latency, high-throughput, read-heavy access and that can scale without creating a metadata bottleneck.

Good options

1. Local SSD / NVMe

Best when files are on the same machine as the reader.

• Very fast random reads
• Handles high concurrency well
• Simple and cheap at small scale
• Great for caches, hot data, and single-node services

Watch out: limited by one host; not shared storage.

2. Distributed file systems / network-attached storage

Examples: Amazon EFS, Azure Files, NFS, CephFS

• Multiple servers can read the same files
• Good if you need shared filesystem semantics
• Easier than managing your own storage cluster

Watch out: performance can vary a lot; metadata-heavy workloads can become bottlenecks.

3. Object storage

Examples: Amazon S3, Google Cloud Storage, Azure Blob

• Excellent for massive concurrent reads
• Highly durable and scalable
• Often the best choice if files are immutable or rarely change
• Works well with CDN caching

Watch out: not a real filesystem; higher latency than local disk, and fewer POSIX features.

4. Read-optimized cache layer

Examples: Redis, memcached, local application cache, CDN

• Very good for ultra-hot files or metadata
• Offloads repeated reads from primary storage
• Can sit in front of any backend

Watch out: only useful if your working set fits in cache.

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Rule of thumb

• Single machine, lots of concurrent reads: local NVMe SSD
• Shared files across many machines: object storage or a distributed filesystem
• Mostly immutable files, internet-facing: object storage + CDN
• Repeated access to a small hot set: add cache on top

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What to avoid for heavy concurrent reads

• Traditional spinning disks
• Storage with weak metadata scaling
• Single shared NFS setups at large scale without benchmarking
• Databases storing large blobs if your main access pattern is “serve files fast”

If you tell me:

1. file size range,
2. read/write ratio,
3. single host vs many servers, and
4. whether you need POSIX filesystem behavior,

I can recommend a specific architecture.