[DRBD-user] sync very slow

Andrea Monte andrea.monte at tecnologic.biz
Wed Jan 3 15:55:46 CET 2007


Leroy van Logchem ha scritto:
>
>>>> I've started drbd on both PC and the sync is running but the rate is
>>>> 400K (in the configuration file I've a max rate=600M) and I must wait
>>>> 7 day to end.
>>>>       
>>> The 600M is unachievable with Gig-E. Maybe the value is too large, try
>>> rate=99M and 'drbdadm adjust all'.
>>>     
>> I've tried rate=100M but is the same; the transfer rate is about 2MB/s
>> and not  400KB/s  like  during sync phase, I think 400KB/s isn't
>> correct.
>> I've another  question:
>> PC client with 100Mb network interface copy  a file to drbd partition (
>> the rate is about 20Mb/s);is the rate of the 2 server linked with 2 1Gb
>> network interface the same or not?
> In short the drbd link should handle +/- 99MB/s. And your PC +/- 10MB/s.
>> (is possible to have the sync rate > the copy rate?) 
> Sure, but the problem is not your 'rate=' setting. Perhaps you first
> verify your
> raw tcp speed using iperf*. You should get >925Mbit/sec over your cross-
> cable. I have no clue about the slow transfer rate, any takers?
>
> * http://dast.nlanr.net/Projects/Iperf2.0/iperf-2.0.2.tar.gz
>
> PS: Please don't top-post
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
Hi,
The output of iperf is 990Mbits/sec





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