Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Am Mittwoch, 9. März 2005 23:10 schrieb Harry Edmon: > I have two 2.6.11 systems with 3ware cards hooked up via drbd 0.7.10. > When set up freshair2 (8000 3ware card) as the primary and sync it to > funnel1 (9000 3ware card), it runs 20-30 MBytes/sec. However, when I > reverse this (funnel1->freshair2) the sync rate is 7 MBytes/sec. I have > tested the network and disk bandwidth by doing a rcp from funnel1to > freshair2, and I get 27 Mbytes/sec, which seems to eliminates the > network and the disk. This is with nothing else running on either > machine. All that is left appears to be drbd. > > Both units are dual Xeon systems, and have have tried them with both > hyperthreading on and off. Anyone have any ideas? I have attached the > drbd.conf file. It seems that the 2.6.11 IO-Scheduling code has some new surprises ready for DRBD. I need some time to understand this new issues completely. What you can do so far: max-buffers 4096 max-epoch-size 1024 __AND__ you need to tune the nr_requests parameter of the backing device via sys-fs. -> 1024 gave me reasonable performance... -Philipp -- : Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com :