[DRBD-user] DRBD9 not syncing permanently??

Julien Escario escario at azylog.net
Fri Jan 22 11:58:23 CET 2016

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Le 21/01/2016 11:59, Rudolf Kasper a écrit :
> Hi,
> i got a question. We've got a setup with three nics. One of them is cross-over
> and only for drbd use. So i expect that we can replicate 120M/s over this nic
> constantly. But when i transfer some files to the drbd device i see sometimes
> traffic on the device and sometimes not.  I got a adaptec 6405 and write-caching
> is disabled so this couldn't be the clue. OS is debian 8. When i'm looking into
> iotop i can see total disk write, but only sometimes there is a peak of actual
> disk write, after this peak the nic generates traffic.
> Is there a disk-cache running? How can i check this and disable it?

You also have a cache on OS level. Perhaps some kind of delayed write ?

Di you tried to run :
# sync
on the copying node ?

You can also make a test with :
# dd if=/dev/zero of=/drbdvolume/testfile bs=1G count=1 oflag=direct

Of course, change /drbdvolume/ with mountpoint of your drbd device.


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