[DRBD-user] Initial Sync - Fast then really slow

Lars Ellenberg Lars.Ellenberg at linbit.com
Thu Apr 8 11:59:54 CEST 2004

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

/ 2004-04-08 01:58:22 +0000
\ Jeff Goris:
> Lars Ellenberg <Lars.Ellenberg at ...> writes:
> > 
> > / 2004-04-07 11:37:05 +1000
> > \ Jeff Goris:
> > > I actually had put this problem aside for over a week due to other more
> > > urgent work. It was only when using rpm to install some security updates
> > > that I became aware of the time zone problem on the dodgy host. I'm not
> > > positive that I had changed nothing else on either host. It was immediately
> > > after fixing the time that I tried a max sync rate of 50 M/sec and managed
> > > to get it to sync fairly constantly at 22,500 K/sec.
> > 
> > DRBD has no idea about wall clock time or timezone.
> > So I can not think of how different wall clock time
> > on the peers would influence DRBD behaviour in any way.
> > 
> > 	Lars Ellenberg
> > 
> Sorry about all my previous posts being in a new thread. Hopefully, this won't 
> happen again.
> Okay, I have reproduced the problem. The crash was caused whilst NTP was 
> drifting the clock from the incorrect time to the correct time. The clock was 
> wrong because a) system clock used UTC, b) I had a timezone about 18 hours 
> behind what it should have been, c) I manually set the time on this host to 
> the current local time and the system clock would have then been 18 hours 
> ahead of the other host.
> To reproduce the problem I simply used the date command on the secondary to 
> set the wall clock time 3 hours in advance of the primary and manually started 
> a full sync on the primary. Part way through the sync the secondary locks up 
> and the primary looks like this:
> version: 0.6.12 (api:64/proto:62)
> 0: cs:WFConnection st:Primary/Unknown ns:267736652 nr:0 dw:144 dr:267736805 
> pe:0 ua:0
>         NEEDS_SYNC

and DRBD is the "only" thing running here, and if the nodes do not
differ in time all works smoothly.

is this what you are saying?


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