[DRBD-user] Dual-primary/ Very slow synchronization

Digimer linux at alteeve.com
Thu May 19 21:16:57 CEST 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 05/19/2011 02:16 PM, Daniel Meszaros wrote:
> Hi!
> 
> Am 05/19/2011 03:48 PM, schrieb Digimer:
>> Setting a sync speed greater than the actual possible speed can hurt
>> performance. You said that you sustained ~200M before, right? Try
>> setting the sync rate to 180M and see if that works any better.
> 
> I set it to 180M like suggested but no improvement unfortunately.
> 
> The "show" parameter showed the same syncer rate that I set up.
> 
> Then I switched back to 100M but the speed is still around 5,500 K/sec.
> 
> Any other config parameters that I could have forgotten? :-/
> 
> As I already wrote: The only thing that changed in the setup are the
> GBICs that I added to one of both switches. Ok, as I obviously haven't
> been informed by the system about the split-brain occurrence I cannot
> say how long the issue has been persisting already. :-(
> 
> CU,
> Mészi.

As Felix stated, try 10M. If it get's up to that speed (and it can take
a while, be patient), then bump it to 20M, etc.

It might be worth adding a log watcher that sends an email when:

block drbd2: Split-Brain detected but unresolved, dropping connection!

Or any occurrence of "split-brain" is found.

-- 
Digimer
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