Marcio Merlone wrote (2011/11/09): > Em 09-11-2011 09:26, Cejka Rudolf escreveu: > > Cejka Rudolf wrote (2011/11/09): > >> does anybody have any idea, why after upgrade from Bacula 2.4.3 to > >> 5.0.3, > >> tape write speed dropped down from about 70-120 MB/s (LTO-3 tape limits) > >> to just 60-70 MB/s? I think that I have seen somewhere, that something > >> (signatures?) has been moved from clients or director to storage daemon, > >> but could not find it anymore. Or could be the problem somewhere else? > > Oops, I'm sorry, I forgot to add -O3. After returning -O3, I can > > see again speeds over 100 MB/s. > > Please enlighten me (us?): Where did you add -03 to improve the speed? I > have an LTO-4 drive and get no more than 50~60 MB/s!
Hello, before compilation, instead of ./configure ... try to use CFLAGS=-O3 ./configure ... and then see your tape drive more happy ;o) If there are no bugs caused by -O3... If Bacula behavior did not change since 2.4.3, the main limiting factor to achieve higher throughput on LTO tapes, is in CRC32 computations performed between disk spool reads and tape writes. -- Rudolf Cejka <cejkar at fit.vutbr.cz> http://www.fit.vutbr.cz/~cejkar Brno University of Technology, Faculty of Information Technology Bozetechova 2, 612 66 Brno, Czech Republic ------------------------------------------------------------------------------ RSA(R) Conference 2012 Save $700 by Nov 18 Register now http://p.sf.net/sfu/rsa-sfdev2dev1 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
