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.
So here are my questions: - Could the mixed version be the reason for the performance penalty? - 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? Thanks for any answers, Arnold
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