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
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