[DRBD-user] Control syncer speed

[Michael Hierweck]

Hi all,

with DRBD 9.0.25 we experience problem with the syncer rate.

Using default settings our IO system gets overloaded, especially when multiple resources are be 
resynced in parallel.

Neither

drbdadm peer-device-options --c-plan-ahead=X --c-max-sync-rate=Y <res>
drbdadm peer-device-options --c-plan-ahead=0 --resync-rate=Y <res>

seem take any effect even when setting Y to very low values, such as 1M.

Thanks in advance,

Michael