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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Linux file transfer speed bottlenecks? (midwest.social)

submitted 9 months ago* (last edited 9 months ago) by archomrade@midwest.social to c/linux@lemmy.ml

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I'm currently watching the progress of a 4tB rsync file transfer, and i'm curious why the speeds are less than the theoretical read/write maximum speeds of the drives involved with the transfer. I know there's a lot that can effect transfer speeds, so I guess i'm not asking why my transfer itself isn't going faster. I'm more just curious what the bottlenecks could be typically?

Assuming a file transfer between 2 physical drives, and:

Both drives are internal SATA III drives with ~~5.0GB/s~~ 5.0Gb/s read/write
files are being transferred using a simple rsync command
there are no other processes running

What would be the likely bottlenecks? Could the motherboard/processor likely limit the speed? The available memory? Or the file structure of the files themselves (whether they are fragmented on the volumes or not)?

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[–] archomrade@midwest.social 2 points 9 months ago* (last edited 9 months ago) (1 children)

SATA III is gigabit, so the max speed is actually 600MB/s.

~~My mistake, though still, a 4tb transfer should take less than 2hr at 5Gb/s (IN THEORY)~~ Thank you @Max_P@lemmy.max-p.me for pointing this out a second time elsewhere: 6Gb/s is what the sata 3 interface is capable of, NOT what the DRIVE is capable of. The marketing material for this drive has clearly psyched me out, the actual transfer speed is 210Mb/s

The filesystem is EXT4 and shared as a SMB... OMV has a fair amount of ram allocated to it, like 16gb or something gratuitous. I'm guessing the way rsync does it's transfers is the culprit, and I honestly can't complain because the integrity of the transfer is crucial.

[–] d3Xt3r@lemmy.nz 2 points 9 months ago* (last edited 9 months ago) (1 children)

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[–] archomrade@midwest.social 1 points 9 months ago

Thanks, corrected my comment above.

I'm interested in ksmbd... I chose SMB simply because I was using it across lunix/windows/mac devices and I was using OMV for managing it, but that doesn't mean I couldn't switch to something better.

Honestly though, I don't need faster transfers typically, I just happen to be switching out a drive right now. SMB through OMV has been perfectly sufficient otherwise.