[DRBD-user] DRBD sync messages every ten seconds

Robinson, Eric eric.robinson at psmnv.com
Sat Mar 5 16:33:43 CET 2011

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

> Lars Ellenberg suggested that the problem was due to a bad 
> NIC. Maybe... but what are the odds that two different 
> systems have a bad NIC?

But it doesn't take two bad NICs, just a bad NIC at one end of the DRBD
link. I note that you said...

> > The DRBD traffic goes over a single Ethernet cable that 
> connects the two systems.

This issue is rather close to my heart, since it just happened to me two
weeks ago. A cluster that was working fine for over a year suddenly
started acting up because the NIC at one end of the DRBD link went bad.

I suggest you disconnect the DRBD resource temporarily (to get
replication traffic off the link) and try a bunch of iperfs from the
primary to the secondary. Be sure to enter the IP for the DRBD link. You
should consistently get about 930mbps. If you get wildly diverging
results, you probably have a flaky NIC at one end.

Eric Robinson

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