This thing is crazy fast :. Transferred: You don't say what size distribution your files have. A file copy proces will only "get into its stride" for larger objects, when a simple bulk transfer is happening. In fact, a few factors hint at a possible cause.
SMR drives overlap the tracks in such a way that reading is done as normal, but every write to the drive, since it overwrites the neighbouring tracks as well, requires the drive to re-write a sizeable chunk of the drive, and the writing is slow.
The miracle is that these drives perform as normal most of the time, because the drive remaps writes to a temporary holding area that doesn't use SMR, and then re-writes them to the drive later in the background. If you stop writing to the drive and let it idle for about 10 minutes, its performance will return to normal because it has had time to clear its temporary holding area, but will fall again if you do another multi-GB sized continuous write.
Despite some comments otherwise, rsync is nice and fast when operating locally, altering its setup accordingly. When operating locally, rsync uses no delta transfer. And, since compressing the transfer would make no sense when it's essentially just over a local pipe, I doubt the -z has any effect, although the documentation doesn't say.
And, --inplace only affects rsync's behaviour when the file exists at the destination and only part of the file needs to be updated. Since delta transfer is disabled when rsync is operating locally, I believe it should have no effect. Avoid using the -v, --verbose option, except when debugging. Especially when redirecting the output to some file. In my case, running rsync with -v was 8x slower than letting it run silently. Consider using the --log-file parameter instead.
Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. How to speed up rsync? Ask Question. Asked 11 years, 11 months ago. Active 4 months ago. Viewed k times. Improve this question. You can also compress files using the -z flag.
Compressing files can reduce network load and speed up file transfer. For large file transfers, it is useful to know the progress of the operation. You can use the -P flag to know the progress of the file transfer. With Rsync, you can also resume file transfers if they are interrupted. Finally, the verbose command can help you understand every step of the file transfer.
You can use the -v flag for this. Rsync simplifies the whole file transfer process by offering a robust, versatile, and flexible tool compared to alternatives like SCP. My my particular case I expect that entire file is to be copied as I generate it each time before the copy. I presume this is because rsync computes deltas to transfer and this seems to be the bottleneck.
The question: Is it possible to make the delta computation "multicore"? For one file you don't gain any bandwidth optimization, neither much with calculation of using multicore, but when have more files, especially thousands with some just needing updates you could use xargs like following. This is not directly multicore, but will run multiple instances of rsync which will surelly load your CPU much more efficiently.
Initially, the User creates a single file with random data on source server:. Delta Transfer uses an algorithm for updating a file on one machine to be identical to a file on another remote machine.
The algorithm identifies parts of the source file which are identical to some parts of the destination file, and only sends those parts which cannot be matched in this way. Effectively, the algorithm computes a set of difference without having both files on the same machine. Typically, Delta Transfer works very well when the two machines are connected by a low-bandwidth, high-latency communications link. In this case, the connection between the two machines is the major bottleneck of the whole system.
By dramatically reducing the amount of the bytes to be sent over the link, the efficiency of the operations would be greatly improved.
If I copy a file from windows explorer from a folder in the synology to a folder in FreeNAS I get more than Mbps with rsync I am only getting about 50!. Joined Jan 1, Messages 5, I saw that what you're doing is actually rsync over SSH so encrypting comms due to the colon in the command. Johnny Fartpants Neophyte Sage. Joined Jul 3, Messages Joined Nov 14, Messages 1, Is this a one-time copy, or something that will happen periodically? The processor in the Synology might be the bottleneck, having to compress and encrypt all the data.
But then, remember that rsync is not aimed at speed but to minimize network traffic. Can you copy the files with Windows, then use rsync to copy any attributes that Windows does not get? Johnny Fartpants said:. Click to expand Last edited: Sep 5, The error seems to indicate that the rsync service isn't running on the end where we changed the script.
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