akos.csurai at ericsson
May 14, 2012, 12:57 AM
Post #3 of 5
Thanks your comment Zev,
Re: a latency problem ( kernel:3.0.13 and drbd-8.3.12 )
[In reply to]
We are about to elaborate an latency-intensive measurement scenario
with both default SLES configurations (SLES10 and SLES11SP2)
and we plan to share the result with this list.
As I reckon 8.2.6 drbd can not be compiled with the 3.0.x kernel,
and I guess that 8.3.12 won't be compiled with 2.16.x kernel too
I hope we can find some kernel (or NFS or drbd) configuration option
that help a bit.
On 05/11/12 20:21, Zev Weiss wrote:
> On May 10, 2012, at 11:00 AM, Csurai Akos wrote:
>> I have a backup time degradation problem.
>> In a nutshell (it looks a write latency performance):
> I've also had problems with DRBD incurring (unreasonable, I would say) additional write latency on my systems. I've been watching this list since last July, and have seen a number of people report similar-sounding problems, but have yet to see any real explanation of why this happens or any solution to the problem.
> The earliest version I've used was 8.3.7, so I can't really speak to whether or not 8.2.6 was any better in this regard. (I did try updating to 8.4.0, but that didn't seem to help and introduced other problems, so I returned to 8.3.x.)
> For what it's worth, when I updated my servers from RHEL5 to RHEL6 (so a 2.6.18-based kernel to a 2.6.32-based one), it "felt" like things may have improved slightly, but not a whole lot (I say "felt" because I don't have any hard before/after numbers on it).
> Zev Weiss
> drbd-user mailing list
> drbd-user [at] lists
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