>>>>> "AL" == Arno Lehmann <[EMAIL PROTECTED]> writes:
AL> Still the network is being used and that always involves latencies, AL> syncronization times, etc. >> >> Yes, and that might be the problem. But if it is about latencies >> and/or synchronization, then it is a bacula performance problem! AL> No, what I'm talking about is network fundamentals. Whenever you send AL> data across a network that takes time, and it takes more time than AL> dividing xMBit/s by the amount of data. Always. Are you talking about the long-fat-pipe problem? This isn't an issue for us... Linux has a very good TCP-implementation, with window-scaling, and we are running over a local GE-network with less than 50us latency. >> Is bacula limited in performance due to high latency? (Not that we >> have that problem, but anyway...) >> >> Is bacula limited in performance due to synchronization? AL> Networks are limited by several factors. That's not something you can AL> fix, and network throughput is not normally the most limiting factor in AL> a Bacula setup. The specific issue here is about bacula. Has bacula any specific limitations regarding the network? Please be specific, and don't just generalize. >> >> But, as you point out, the tar should be faster. It doesn't need to >> >> write to net. However, not 2 times faster. The net-load is ~1% (10 >> >> Mbit/s on a GE-network), and *should* not affect the performance in >> >> this case. >> AL> *Should* is not very helpful here... instead, send the tar output AL> through a netcat to the backup server and write it to disk. For example. >> >> But we have two scenarios here: >> >> 1. Bacula is affected by a very low network load. >> >> 2. Bacula isn't affected by a very low network load. >> >> If (1) is true, why??? AL> Erm, no, I see no such scenario. I see you claim that a (mostly idle) AL> network transfers data as fast as a tar > /dev/null which is not true. I've never claimed that "network transfers data as fast as a tar > /dev/null". I only claimed that network performance shouldn't be a limiting factor in this specific case. / Anders ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
