Jinshi wrote:
> Thank you all for your reply. Apparently everyone consider this is too
> slow since the difference between usb2.0 and usb1.1 is quite big. But I
> do tested all other usb ports. The dmesg says the transfer speed is
> either 40.000MB or 1.000MB/s. So, sorry everyone, I still insist I have
> usb2.0 here :)
>
> I didn't reply sooner because I want to wait and see how long the backup
> is. Now, total file about 170GB (I moved some files from other computer.
> Those files were backed up before, so the hash files are available on
> the backup computer). There is almost no new files (details below). And
> full backup by SMB transfer takes 32 hours (only 7.3MB new files), by
> rsyncd transfer takes 26 hours (1.8GB new files since my wife uploaded
> more photos during SMB backup time).
Was the rsync run a full or incremental? A mostly unchanged incremental
should be much faster than a full because the full does a block checksum
comparison even on files where the timestamp and length match.
> So, rsyncd helps, but not a lot, just like Serge predicted. Average
> transfer speed is 1.5 and 1.8 MB/sec, respectively.
>
> Now, back to my original question: where is the bottleneck? I am going
> to upgrade the computer to P4. If that still doesn't help much, I don't
> know what to do next?!
Rsync transfers the entire directory listing before starting so there is
a certain amount of RAM needed per file - if you have less the server
might start swapping and slow down. Depending on your directory layout,
it might be possible to break the target up into several smaller chunks
to help with this. Also, a slightly more extreme approach would be to
make the subdirectory runs appear to be different hosts using the alias
feature. That way you could stagger the full and incremental runs so
you don't have to complete a full in one day.
--
Les Mikesell
[EMAIL PROTECTED]
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