[DRBD-user] Very slow sync speed

Wienke Giezeman wgiezeman at gmail.com
Tue Jul 26 10:19:37 CEST 2005

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


Thnx for you help, but eventually the problem wasn't in the systems
but in a crapy switch which resulted in a huge amount of packetloss.
Directly connecting the systems with a crosslink utp cable did the
trick.


On 7/25/05, Lars Ellenberg <Lars.Ellenberg at linbit.com> wrote: 
> / 2005-07-25 11:24:50 +0200
> \ Wienke Giezeman:
> > I have set up a Linux-HA configuration on two systems. DRBD is working, but
> > the speed is very low. It never exceeds 500 Kb. Although I've set rate in
> > drbd.conf to 700000
> 
> try to set the sync rate more into the range you actually
> expect from your hardware, maybe that helps.
> 
> and just check the obvious:
> 
> what does hdparm say about your disks?
> dma enabled?
> hdparm -t -T /dev/whatever ?
> 
> hackish benchmark for poor people:
> right# netcat -l -p 7777 | time dd of=/dev/somewhere bs=4k count=1234567 ; time sync
> left# dd if=/dev/whatever bs=4k count=1234567 | netcat right 7777
> 
> is anything else accessing (seeking on) the physical disk?
> 
> etc.
> 
> cheers,
> 
> --
> : Lars Ellenberg                                  Tel +43-1-8178292-0  :
> : LINBIT Information Technologies GmbH            Fax +43-1-8178292-82 :
> : Schoenbrunner Str. 244, A-1120 Vienna/Europe   http://www.linbit.com :
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