Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 11/18/2014 09:44 AM, Darren Ginter wrote:
> Hello all,
>
> With Ubuntu 14.04 (drbd 8.4.4), I cannot get more than 40MBps out of the
> initial DRBD initialization sync no matter what settings (sync-rate,
> c-max-rate, c-min-rate, etc). I've been playing with this for tens of
> hours now. I've tried drbd 8.4.5 and above to no avail.
>
> With Ubuntu 12.04 (drbd 8.4.3) I can max out a 10GbE NIC without issue on
> the same hardware.
You may need to tune 'max-buffers' and 'max-epoch-size' to get some more
performance out of the secondary node. This is outlined in the user's
guide (section 15.3.1).
I have the values below configured on a system running DRBD 8.4.5,
resyncing at ~400MiB/s (almost the max write speed of the backing disk):
resource <resource> {
net {
max-buffers 80k;
max-epoch-size 20k;
...
}
...
}
Those settings are a little extreme; start at 8000, and tune accordingly.
--
: Matt Kereczman
: LINBIT | "Your Way to High Availability"
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