Rclone copy starts great but quickly goes bad

Help and Support
1

What is the problem you are having with rclone?

I am transferring files from one RAID drive to another 26TB drive. When I do disk speed tests on both disks I get read/write speeds of about 200MB/s and when I first start the rclone copy process it gets around 150MB/s but it quickly starts degrading and I’ve seen it go down to as low as 20MB/s.

Neither of these drives is my boot drive but I’m wondering if I might be having a cache problem or something, I’m not sure. Any help is appreciated!

Run the command 'rclone version' and share the full output of the command.

rclone v1.54.1

  • os/arch: darwin/amd64
  • go version: go1.16

Which cloud storage system are you using? (eg Google Drive)

None

The command you were trying to run (eg rclone copy /tmp remote:tmp)

rclone copy '3-9-25' /volumes/'expansion drive'/3-9-25 --progress

Please run 'rclone config redacted' and share the full output. If you get command not found, please make sure to update rclone.

Paste config here

A log from the command that you were trying to run with the -vv flag

Paste  log here
2

welcome to the forum,

that version is over four years old.

  1. uninstall that version
  2. https://rclone.org/install/#script-installation
  3. test again
3

I’m using mac OS Mojave (which I understand is outdated, but I’m in the process of upgrading but can’t upgrade until this process is complete. It wasn’t always this slow to copy, do you think the only problem is the version of rclone?

4

fwiw, i rarely use rclone for local to local. imho, better tools for that.
just curious, why use rclone?

well, if you are running the same version of rclone and the same command,
then perhaps something changed on your end.

must use a rclone debug log and read it for issues.

it is over four years old so that is a problem.
try increasing --transfers and --checkers

5

It is often indeed good solution but as 26TB drive is mentioned it is probably not SSD.. in this situation actually opposite might be more beneficial (decreasing --transfers and --checkers). Such disks are not very good at parallel operations. For only big files I would actually go with:

--transfers 1 --check-first

it would first do all files listing and checking what to transfer followed by single transfer operations.

If there are many small files then I am afraid it always will be slow on HDD. A fact of life.

6

Still upgrade your rclone.

v1.63.1 is the latest version that should work on Mojave.

7

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