On 08/13/2012 07:43 PM, Dennis Jacobfeuerborn wrote:
On 08/03/2012 03:27 AM, Dennis Jacobfeuerborn wrote:
Hi,
I just set up a traditional drbd primary/secondary system between two hosts
that are connected with gigabit ports. The problem is that the resync rate
is only 5M even though in the config file I set it to 40M.
I also tried:
drbdadm disk-options --resync-rate=40M drbd1
which doesn't result in an error but apparently doesn't get applied either.
I also tried 1M but that gets ignored too.
Any idea what might be going on here?
(This is drbd 8.4.1 on a Centos 6.3 system)
There is also a setting called
c-max-rate that if not set, is set to 20M I think.
Also, the wild jumping around sounds like a network issue. I have a
10GB crossover cable connecting my two DRBD nodes, and have jumbo frames
turned on, and can get near wire speed (of the disk bus) through it.
Are you doing sync through a switch? If so, are your MTUs set
consistently? Do you have any type of broadcast storm control in your
switches? I think DRBD will trigger storm control in switches too.
Does nobody have any idea?
I just had to re-sync and the "want" value jumped around wildly between 0
K/sec and 80.000 K/sec and the speed it self is terrible:
finish: 0:05:07 speed: 608 (628) want: 7,160 K/sec
finish: 0:04:33 speed: 684 (628) want: 43,760 K/sec
finish: 0:04:38 speed: 680 (628) want: 9,600 K/sec
finish: 0:05:04 speed: 624 (628) want: 0 K/sec
finish: 0:04:51 speed: 648 (628) want: 10,760 K/sec
It looks like the variable sync mechanism does more harm than good and I
don't seem to be able to turn it off properly.
Regards,
Dennis
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--
Regards,
Nik
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