On 11/30/2011 05:03 PM, Arnold Krille wrote: > Hi all, > > I am a bit stumped currently. Our drbd setup seems to include "extra low > performance" as a feature and I don't exactly know where the reason is. > On thing the bothers bothers us is that the versions of the userspace tools > and the kernel module differ (drbd8-utils v8.3.7 vs module v8.3.9). > The newer kernel-module is a side-effect of the kernel from debian squeeze > backports needed for the new network-cards. But the versions installed on > both > nodes are the same. > Using latency- and throughput tests from the drbd documentation, the latency > rises by a factor of ten and the throughput sinks by a factor of ~5 from the > baccking devices to the drbd device.
What does your drbd config look like? How did you test? What is your current drbd state ... cat /proc/drbd? > > So here are my questions: > - Could the mixed version be the reason for the performance penalty? No. > - Would it be save to downgrade the kernel (and compile the network-driver > by > hand) or is the meta-data on the disk incompatible? > - Or would you rather update the userspace tools to match the modules > version? I would upgrade drbd module _and_ usertools to latest 8.3.12. ... 8.3.9 has a know regression that affects small synchronous writes, that may be an explanation for the increased latency. Regards, Andreas -- Need help with DRBD? http://www.hastexo.com/now > > Thanks for any answers, > > Arnold > > > > _______________________________________________ > drbd-user mailing list > [email protected] > http://lists.linbit.com/mailman/listinfo/drbd-user
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