[DRBD-user] Sync slow with drbd 0.7.10 and linux 2.6.11
philipp.reisner at linbit.com
Mon Mar 14 10:43:00 CET 2005
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
What you can do so far:
you need to tune the nr_requests parameter of the backing device
via sys-fs. -> 1024 gave me reasonable performance...
: 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 :
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