[email protected]> Stephane Ascoet via rsync wrote:
> Hi, I'm backing up contents of my > GOBook(http://sascoet.mutu.fdn.fr/monalbum/albums/sa-12082010fujitsugigamos2300scsifleury-les-aubraisrecusdemonsauveurcomputermagneticsdmc-lx2/sa-1208201012h39fujitsugigamo2300scsiconnecteagobookfleury-les-aubraisrecusdemonsauveurcomputermagneticsdmc-lx2.jpg) > before it dies completely on a dell laptop via my LAN(netstat indicates a > 11.8MB/s speed between the two computers via this one). > > On the GOBook I launch "rsync --daemon"(3.1.1-3 version) > > On the dell: rsync -abSbHXz --progress(3.1.2-1 version) > > CPUs are doing almost nothing. So does the GOBook HDD. The destination is on > a mounted logical volume in Ext2 on a nvme SSD. > > And the indicated speed transfer is around 50kB/s!!! I tried -W option: it's > even slower. Same thing when I put off the "z"(anyway, CPUs aren't doing > nothing). > > If I netstat during the backup, it appears that there is about 4MB/s used, > so almost 100 times more than the actual data written on destination! And > why not 11MB/s since my network can do it? > > I spent hours searching an explanation on the Web, nothing explaining what's > happening in a sufficient satisfaying way for me. Does somenone on this list > have a clue? > > -- > Sincerely, Stephane Ascoet Hi, I probably can't help. The only time I had rsync being slow enough to bother me, it was being slowed down by ssh's encryption, but that was a long time ago, and you're not even using ssh. The only thing I can suggest is that your network bandwidth is being used up by something else (whatever is using up that 4MB/s) but that sounds unlikely, and even so, there should still be another 8MB/s to spare. Wireshark could help you identify what the traffic is. I just saw the picture. It looks super old. Perhaps the problem is the disk I/O speed on the gobook itself. Is that possible? I have no idea how old it is or what old I/O speeds were like. Can you run top on the gobook? Is there iowait? If so, that might be the problem. Also, if the gobook is really old, its network interface might only be 10Mbps, but even that should mean 1.25MB/s (if the disk I/O speed can keep up). My advice is to let it run now while it still can. :-) Or you could try scp just to see if the transfer speed is any different. cheers, raf -- Please use reply-all for most replies to avoid omitting the mailing list. To unsubscribe or change options: https://lists.samba.org/mailman/listinfo/rsync Before posting, read: http://www.catb.org/~esr/faqs/smart-questions.html
