[DRBD-user] Re: DRBD sync very slow, High CPU on secondary

Bart Coninckx bart.coninckx at telenet.be
Sat Oct 4 12:57:43 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.

>  Hi,
> I have DRBD 0.7.22 running on two SLES 10 SP1 servers. The partitions for
> DRBD are located on a LVM volume. While doing the initial sync, it seems
> that this is very slow:
> 0: cs:SyncSource st:Primary/Secondary ld:Consistent
> ns:598700 nr:0 dw:0 dr:601844 al:0 bm:36 lo:0 pe:198 ua:786 ap:0
> [>...................] sync'ed: 0.1% (604824/605408)M
> finish: 215:02:54 speed: 708 (684) K/sec
> I use dedicated gigabit NICs for this, having tried a straight and crossed
> cable and a switch. "ethtool" reports 1000 Mbits. Filecopies with SCP go
> beyond 80 MB/sec. The "rate" parameter in drbd.conf is at 33M, which I
> derived from the drbd.org site.
> I do get this in the secondary node:
> Cpu0 : 0.0%us, 0.3%sy, 0.0%ni, 0.0%id, 99.3%wa, 0.0%hi, 0.3%si, 0.0%st
> Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
> Cpu2 : 0.0%us, 0.0%sy, 0.0%ni, 0.0%id,100.0%wa, 0.0%hi, 0.0%si, 0.0%st
> Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
> Which seems to indicate that twee CPUs are at 100%.
> Anyone any idea as to why?
> Thank you!
> Bart


insipred by another thread, I changed the network cards for the DRBD sync 
link, hoping this would fix things, but the same result applies. 

Anyone any ideas whatsover?

Any help is much appreciated!

Thank you!


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