Change all concurrentUploadLimitMB and concurrentDownloadLimitMB defaults
from fixed values (64, 128, 256 MB) to 0 (unlimited).
This removes artificial throttling that can limit throughput on high-performance
systems, especially on all-flash setups with many cores.
Files changed:
- volume.go: concurrentUploadLimitMB 256->0, concurrentDownloadLimitMB 256->0
- server.go: filer/volume/s3 concurrent limits 64/128->0
- s3.go: concurrentUploadLimitMB 128->0
- filer.go: concurrentUploadLimitMB 128->0, s3.concurrentUploadLimitMB 128->0
Users can still set explicit limits if needed for resource management.
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