[DRBD-user] Resync causing high load on peer

Ítalo Rossi adm.italo at digi.com.br
Tue Mar 18 20:32:18 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.

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?!?

I decided to pause the resync process until this question is answered..

Thanks in advance!

dmesg output:

drbd1: conn( Unconnected -> WFConnection )
drbd1: Handshake successful: Agreed network protocol version 88
drbd1: conn( WFConnection -> WFReportParams )
drbd1: Starting asender thread (from drbd1_receiver [2558])
drbd1: data-integrity-alg: <not-used>
drbd1: peer( Unknown -> Secondary ) conn( WFReportParams ->  
WFBitMapS ) pdsk( DUnknown -> UpToDate )
drbd1: Writing meta data super block now.
drbd1: conn( WFBitMapS -> SyncSource ) pdsk( UpToDate -> Inconsistent )
drbd1: Began resync as SyncSource (will sync 84275596 KB [21068899  
bits set]).
drbd1: Writing meta data super block now.
drbd1: conn( SyncSource -> PausedSyncS ) peer_isp( 0 -> 1 )
drbd1: Resync suspended

[root at megatron ~]# cat /proc/drbd
version: 8.2.5 (api:88/proto:86-88)
GIT-hash: 9faf052fdae5ef0c61b4d03890e2d2eab550610c build by root at megatron.digi.com.br 
, 2008-02-28 01:26:56
  1: cs:PausedSyncT st:Secondary/Primary ds:Inconsistent/UpToDate C r--u
     ns:0 nr:2697325 dw:2697325 dr:0 al:0 bm:645 lo:1 pe:0 ua:1 ap:0
	resync: used:0/31 hits:196620 misses:16606 starving:0 dirty:0 changed: 
	act_log: used:0/127 hits:0 misses:0 starving:0 dirty:0 changed:0

Ítalo Rossi
Administração de redes
Diginet Brasil
adm.italo at digi.com.br
(+55) 84 4008-9000

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