Hello all,
we have a new setup with xen on centos5.3
I run drbd from lvm volumes to mirror data between the two servers.
both servers are 1U nec rack mounts with 8GB RAM, 2x mirrored 1TB
seagate satas.
The one is a dual core xeon, and the other a quad-core xeon.
I have a gigabit crossover link between the two with an MTU of 9000 on
each end.
I currently have 6 drbds mirroring across that link.
The highest speed I can get through that link with drbd is 11 MB/sec
(megabytes)
But if I copy a 1 gig file over that link I get 110 MB/sec.
Why is DRBD so slow?
I am not using drbd encryption because of the back to back link.
Here is a part of my drbd config:
# cat /etc/drbd.conf
global {
usage-count yes;
}
common {
protocol C;
syncer { rate 80M; }
net {
allow-two-primaries;
}
}
resource xenotrs {
device /dev/drbd6;
disk /dev/vg0/xenotrs;
meta-disk internal;
on baldur.somedomain.local {
address 10.99.99.1:7793;
}
on thor.somedomain.local {
address 10.99.99.2:7793;
}
}
Kind regards,
Coert