[DRBD-user] Sync speed (getting to the limit)

Florian Haas florian at hastexo.com
Fri Apr 6 09:33:01 CEST 2012

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


On Fri, Apr 6, 2012 at 3:10 AM, Brian R. Hellman <brian at linbit.com> wrote:
>
>
> On 04/05/2012 05:58 PM, Marcelo Pereira wrote:
>> Hi DRBD masters,
>>
>> I have been trying to push the sync speed to the limit, as the server
>> was offline for a while and I will release it for general use only
>> after it's sync'ed. So, nobody is using and I can use full speed.
>>
>> I have two servers, each one connected to a NAS unit through a CAT6
>> cable, no switches in between. It's 1000 Mpbs full duplex, as the
>> ethtool says.
>>
>> I tried to push to the limit, issuing the following:
>>
>> [~]# /sbin/drbdsetup /dev/drbd0 syncer -r 685M
> Please note that this rate is in MB/sec not Mb/s, ideally you should set
> it around 80% of your connection speed.

Did the 30% recommendation change (for statically defined sync rates),
and if it did, when and why?
http://www.drbd.org/users-guide/s-configure-sync-rate.html does still
mention it.

Cheers
Florian

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