Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
looks like the backing device is not fast enough... do you use one drbd per physical device (and with physical I mean real hardware like a raid set) or are actually multiple drbd devices accessing the same disks? If the second is true try syncing the devices one after the other. please post output of iostat -m 10 -xtc Are there already other applications accessing the drbd devices from the upper layer on the primary? That usually causes drbd to reduce sync speed as the upper layers are preferred IIRC. I have already seen sync speed of more than 400Mbytes/s with drbd 8.4 over a 10GE link with magnetic disk backends so it is definitely possible, we synced a 16TB device once in only a few hours, but I can remember that sync speed dramatically decreased as load from the upper layer rose, which is quiet normal as the access is not linear anymore if this occurs. regards, Felix