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Scratch provides direct access to the underlying high performance file system: Koa Storage, which utilizes Lustre. Lustre is designed for situations where many servers and workloads need to read and write data as quickly as possible. While Lustre works best with long sequential read/writes, and exhibits poorer performance with small random reads, but methods exist to work around this limitation. Workaround Workarounds would include the use of squashfs as we cover in our documentation or archive formats that combine multiple small files that align with your workflow, such as HDF5.
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