[DRBD-user] Initial Sync - Fast then really slow
philipp.reisner at linbit.com
Tue Apr 6 10:59:35 CEST 2004
On Tuesday 06 April 2004 07:18, Jeff Goris wrote:
> > So, I reset the sync, and I notice its going a decent clip in the 40meg
> > range. I distract myself and get to another chore. I come back to the
> > machine and notice this rate has dropped to about 500. (It happens to
> > do this not too far after reaching near the 10gig mark). I knocked up
> > the sync-min to 10megs. However, this is still occurring and I'm not
> > quite sure whats going on.
> > I am running an IDE software raid on each box as well, which I know
> > could have some impact on performance, although I'm guessing it should
> > be capable of sustaining more throughput than just 500k/s.
> I'm running a fairly similar configuration. RedHat 9.0, drbd-0.6.12,
> channel bonded gigabit crossover, with 90GB software RAID devices on each
> node and I came across this same problem when I set it up.
> > Any idea's? Thanks,
> Perhaps check the clocks on each machine. I did notice that the clocks on
> each of my hosts were different as one was set to the wrong timezone. I
> fixed the timezone and had each host sync off an NTP source to ensure they
> kept accurate time. Then the replication rate was stable the whole way
> through at about 22,500 K/sec.
Just an uneducated guess:
Might it be that the software raid started its resync process ?
: Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 :
: LINBIT Information Technologies GmbH Fax +43-1-8178292-82 :
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