Re: rsync 10 times slower in Etch than in Sarge!

On 2008-01-18 15:32 +0100, Rodolfo Medina wrote:

I do my daily backup with the following command:

$ rsync -vr --delete Mail News /mnt/sda

(where `sda' is the pendrive), and I've calculated that in my new Debian
Etch system the process is about 10 times slower than it was in Sarge!
It is the same with both my desktop PC and my laptop. In /etc/fstab I
have the following entry:

/dev/sda /mnt/sda vfat sync,rw,user,noauto 0 0

. The backup that would take only a few minutes now takes almost one
hour! Can anybody please explain this strange phenomena?



Sven Joachim <svenjoac@xxxxxx> writes:

IIRC it's an issue with vfat file systems and the "sync" mount option in
2.6 kernels. I noticed the same phenomenon when I switched from 2.4 to
2.6;

I see...


the solution is not to use the "sync" option, that also increases
your drive's lifetime.

I put the `sync' option just to avoid drive corruption. If it is
necessary to toggle it off, how can I be sure the process is terminated
before I unmount the drive?



You may want to add "sync" as the last command in
your backup script do avoid data loss.

I looked into `sync' manual but couldn't find out how to use this
command. What should I say instead of
`rsync -vr --delete Mail News /mnt/sda'?


Thanks for your help
Rodolfo


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