[DRBD-user] Userspace- vs. Kernelspaceversions

Andreas Kurz andreas at hastexo.com
Wed Nov 30 23:05:15 CET 2011

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On 11/30/2011 08:57 PM, Arnold Krille wrote:
> Hi again,
> public thanks to Andreas Kurz, who answered and helped in private (altough 
> only writing one email:).

yeah ... sorry, wrong reply button

> According to his recommendation I updated both nodes to 8.3.12. That alone 
> didn't fix the performance problem. But setting "al-extents 3389;" (and getting 
> the parameter correctly) seems to fix the problem.

good to hear.


Need help with DRBD?

> Gotta see if it proves itself tomorrow when my colleagues want to do their 
> daily share of work.
> Have a good night,
> Arnold
> On Wednesday 30 November 2011 17:03:21 Arnold Krille wrote:
>> 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?
>> _______________________________________________
>> drbd-user mailing list
>> drbd-user at lists.linbit.com
>> http://lists.linbit.com/mailman/listinfo/drbd-user

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