[DRBD-user] Resync causing high load on peer

Ítalo Rossi adm.italo at digi.com.br
Wed Mar 19 13:08:15 CET 2008

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


Sorry!! The configuration:

# drbdsetup /dev/drbd1 show
syncer {
	rate            	102400k; # bytes/second
	after           	-1 _is_default;
	al-extents      	127 _is_default;
	verify-alg      	"";

# cat drbd.conf:
resource stg-emails {
	protocol C;
	disk {
		on-io-error pass_on;
		size 3426944M;
	syncer {
		rate	100M;
	on etch {
		device	/dev/drbd1;
		disk	/dev/stg-emails/md3000-0;
		meta-disk	internal;
	on redhat {
		device	/dev/drbd1;
		disk	/dev/sdb2;
		meta-disk	internal;

I wan't to reduce the trasfer rate to 30M to decrease load avg on  

On Mar 19, 2008, at 6:26 AM, Lars Ellenberg wrote:

> On Tue, Mar 18, 2008 at 04:32:18PM -0300, Ítalo Rossi wrote:
>> Hello all,
>> We have two nodes with drbd8.2.5 installed (redhat AS - kernel  
>> and debian etch - kernel 2.6.22).
>> My primary node (debian etch) needed to be halted for some time, so  
>> I put
>> the secondary node on primary state and run my services without any
>> problem.
>> When the other (debian etch) node become active, the resync cause a  
>> high
>> load average on the redhat node (~= 130).
>> Suspecting of low I/O's capacity and my application having hard  
>> write on
>> disk, I've tried to reduce the transfer rate from 100M to 30M but:
>> # drbdadm adjust -d resource
>> 7018381312s: out of range
>> Out of range?!?
> please provide
> drbdsetup /dev/drbd1 show
> drbd.conf
> -- 
> : Lars Ellenberg                           http://www.linbit.com :
> : DRBD/HA support and consulting             sales at linbit.com :
> : LINBIT Information Technologies GmbH      Tel +43-1-8178292-0  :
> : Vivenotgasse 48, A-1120 Vienna/Europe     Fax +43-1-8178292-82 :
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Ítalo Rossi
Administração de redes
Diginet Brasil
adm.italo at digi.com.br
(+55) 84 4008-9000

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