[DRBD-user] Re: DRBD ping-timeout values

George H george.dma at gmail.com
Fri Apr 4 13:45:05 CEST 2008

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


On 4/4/08, Lars Ellenberg <lars.ellenberg at linbit.com> wrote:
> On Fri, Apr 04, 2008 at 03:37:31AM -0500, George H wrote:
>  > >  I am using default values for ping-int, pint-timeout, which are   10
>  > >  and 500 (respectively). To me this looks like the DRBD software is
>  > >  lagging in replying to the pingAck , am I right on this? if I increase
>  > >  the ping-timeout to something bigger like 1000 or 2000 will it solve
>  > >  this problem?
>
>
> the unit of these values are centi seconds,
>  so "ping-timeout 100" is 10 seconds.
>  if a drbd peer cannot answer a single packet within ten seconds,
>  you either managed to get DRBD locked up somewhere, or your network
>  stack is broken. or both, one leading to the other...

Lars, you're right, I didn't understand the units when I posted. I
tried two different settings.
I tried "ping-timeout 100"  which gave me really really bad results
where i'd get the pingAck error very often.

When I set ping-timeout 20 , the sync went for 1 hour and then pingAck
error after that. While doing the drbd sync I was running a continous
ping from the SyncSource node to the SyncTarget node and it was
replying between 0.100 and 0.700 ms.

>  --
>  : Lars Ellenberg                           http://www.linbit.com :
>  : DRBD/HA support and consulting             sales at linbit.com :
>  : LINBIT Information Technologies GmbH      Tel +43-1-8178292-0  :
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