Upload a file in fixed-size parts with mc od (object dispersion / erasure-code style part upload)
domain: min.io · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Use mc od to upload a local file to a remote target in a controlled number of parts and part sizes, mimicking the Linux dd tool for throughput testing.
Basic full upload: mc od if=file.zip of=ALIAS/BUCKET/file.zip size=40MiB (splits source into 40MiB parts, uploads all of them).
Control the exact number of parts: mc od if=file.zip of=ALIAS/BUCKET/file.zip size=40MiB parts=5 -> divides into 5 equal parts; if source is larger than 5*40MiB only the first 200MiB uploads.
Skip N leading parts to test throughput on a portion of a large object: mc od if=big.bin of=ALIAS/BUCKET/big.bin size=10MiB parts=100 skip=20.
With --json global flag, output includes partSize, totalSize, parts, and elapsed upload time - useful for benchmarking.
Known gotchas
Specifying manual size and parts may PRODUCE AN INCOMPLETE OBJECT if the part count/size totals less than the real file size - only the covered bytes upload.
size/parts are optional; if omitted MinIO derives them from the source stream size.
mc (and S3-compatible behavior) is only guaranteed against MinIO and AWS S3; other S3-compatible services are unsupported.
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