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Forum Discussion
Speeding up rsync
Am about to upgrade some drives in my readynas and was wondering if there was a way to speed up the process. I had read that speed_limit_max is the throughput ceiling that applies when there is n...
It's 200 MB/sec, not 200 KB/sec. If you're not using all SSDs, then this limit will probably never be hit anyway. If you are using all SSDs, then the limit likely will be hit; but it's there for a reason, so the resync doesn't eat up all the CPU cycles doing parity calculation.
If it was 200MB/sec, it wouldn't take 65 hours to rsync an 8TB drive.
If I do watch cat /proc/mdstat it shows: speed=25780K/sec
Perfect, then that confirms that changing dev.raid.speed_limit_max will make no difference for you. It sounds like it's probably doing a reshape rather than a resync. Reshapes involve a more work than resyncs, and are thus much slower. The 25 MB/sec you are seeing sounds about right.
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