Rsync is designed to reduce the amount of data transmitted over the
network. If rsync isn't networking it can't do that. However, it still
uses the same code so it is still using a sender and a receiver rather
than simply reading and writing as cp does. Also, rsync forces
--whole-file because using rsync's algorithm to delta-copy is slower
than just re-copying a file (especially if one of the local paths is
really a network mount and double especially if that is the writing end).
On 11/28/21 16:44, Harry Mangalam wrote:
Can you elaborate on why this is?
I wrote a parallel rsync wrapper that works very well over networks but
is similarly very slow over local disks. I thought it was a bug in my
code but didn't get around to tracking it down since my use cases were
all network/ parallel file systems.
Harry
On Sun, Nov 28, 2021, 11:43 AM Kevin Korb via rsync
<rsync@lists.samba.org <mailto:rsync@lists.samba.org>> wrote:
rsync is terribly slow at local copies. Also, it doesn't do its normal
optimizing (see --whole-file). Just use cp.
On 11/28/21 13:38, Mario Marietto via rsync wrote:
> Hello to everyone.
>
> I'm copying a large file from a NTFS formatted disk to another
> one,UFS/FreeBSD disk,both are removable disks attached to the USB 3
> port. The file is 200 GB large and it is copied very slowly. Why
it is
> so slow ? I don't know where to store my virtual machines. I
tried to
> save them on the ext4 disk because I wanted to share them easily
between
> Linux and FreeBSD but I've realized that when I mount the disk in
> FreeBSD after some time it corrupts. I tried to store it on the NTFS
> disk but it happens the same. So,now I'm on FreeBSD and I'm
copying them
> to a dedicated UFS/FreeBSD style disk,but as I said,the speed is
very
> slow. How can I increase the speed ?. Actually I'm using this
> command,because I want to resume the uploading if it breaks at
some point :
>
>
> root@marietto:/mnt/da3p2/bhyve/Ubuntu # rsync -avAXEWSlHh
> /mnt/da0p1/Backups/OS/bhyve/Ubuntu/im* . --no-compress
--info=progress2
>
> sending incremental file list
> impish-cuda-11-4-nvidia-470.img
>
> 2.13M 0% 9.49kB/s 6284:55:38
>
>
> and : where do you save large files ? what's the procedure that
you use
> to copy large files with a decent speed ? Unfortunately under
Linux is
> not safe to use a RW ufs disk access. So,I'm out of solutions.
>
> -
> Mario.
>
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Kevin Korb Phone: (407) 252-6853
Systems Administrator Internet:
FutureQuest, Inc. ke...@futurequest.net (work)
Orlando, Florida k...@sanitarium.net (personal)
Web page: https://sanitarium.net/
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