Aw: Rsync differences using NFS & SMB

devzero at devzero at
Tue Jul 21 10:20:11 UTC 2015

>Over ssh/nfs
>rsync -nuvaz --delete /source/ root at

i don`t see nfs here, i see rsync syncing a local dir via ssh to a local dir on the target system. 

does just export NFS shares to other systems or are there other NFS shares being mounted there, 
i.e. is rsync writing via SSH to nfsserver:/some_dir_mounted_via_nfs


> Gesendet: Dienstag, 21. Juli 2015 um 10:48 Uhr
> Von: "Simon Wong (Staff)" <s.wong at>
> An: "rsync at" <rsync at>
> Betreff: Rsync differences using NFS & SMB
> Hi,
> I’m having difficulties trying to understand the performance differences
> between NFS and SMB. I  have used rsync (OS X) over SMB (mounted network
> storage) and using rsync (OS X) over SSH (NFS mounted storage)
> From my test, rsync over SMB builds a file list each time comparing
> modified source/destination, where as rsync over ssh/nfs is incredibly
> quicker, pretty much instant.
> During the test;
> - when running rsync to the mounted storage on Linux, it identified
> new/deleted files immediately!
> - When running rsync over SMB, it builds a complete file list and lists
> each directory before any copy takes place.
> To the users perception, building the file list (lets say the user has
> hundreds/thousands of folders) takes some time to run through each
> directory.  Once the rsync completes the initial copy, on the second
> rsync, it completes within seconds.  As expected, right?
> The problem occurs when I unmount and remount the SMB share.  If I run
> rsync again it builds the whole file list and begins to run through 'every
> folder”, even if there is nothing to copy!
> This is not the same behaviour using rsync via ssh over nfs, it doesn’t
> appear to show "building file list" and immediately informs the user if
> files are copying or the completion time.  I have tried multiple
> troubleshooting, even unmounting the the NFS share and clearing the cached
> memory in Linux with no success.
> The commands I have played around with are;-
> Over smb
> rsync -uvaz --delete /source /destination
> rsync -aHEXAx -v --delete --progress --stats --timeout=999 /source
> /destination  (tried without —progress and —stats, same behaviour)
> Over ssh/nfs
> rsync -nuvaz --delete /source/ root at
> Thanks,
> Si
> The University of Dundee is a registered Scottish Charity, No: SC015096
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