Hi Lon Thans again, but that's strange because in the man , the recommended values are : intervall="1" tko="10" and so we have a result < 21s which is the default value of heart-beat timer, so not a hair above like you recommened in previous email ... extract of man qddisk : interval="1" This is the frequency of read/write cycles, in seconds. tko="10" This is the number of cycles a node must miss in order to be declared dead. ? So the better values to match with the default heart-beat timeout of 21s should be : interval="2" and tko="11" right ? Thanks Regards Alain Moullé -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster