Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi,
We
are setting up a drbd system use for XEN virtualization. The
performance we tested on VM is not ideal. The setup is like this
XEN+DRBD+LVM+SOFTWARE RAID 1. Is anyone have this similar setup? What
performance you can achive?
Here are the details of our setup:
Hardware:
CPU : Intel Core i7 3770 CPU
RAM : 32GB
Hard Drive : 2 x 2TB SATA3 Western Digital Hard Drive, Software RAID 1 setup
NIC : 2 Intel Gigabit Pro 1000CT PCIe. One is dedicate to DRBD direct link (cross over)
Software:
Ubuntu 12.04 for the host.
Centos 6.3 for the guest vm (Para virtualize) .
DRBD 8.4.3
Xen 4.1
drbd.conf :
global
{
usage-count no;
}
common {
protocol C;
startup {
degr-wfc-timeout 60;
wfc-timeout 30;
}
net {
allow-two-primaries; ### For Primary/Primary ###
after-sb-0pri
discard-zero-changes;
after-sb-1pri violently-as0p;
after-sb-2pri violently-as0p;
sndbuf-size 0;
}
syncer {
rate 100M;
verify-alg sha1;
}
}
resource c6pv153 {
disk /dev/vmVg/c6pv153;
device
/dev/drbd1;
meta-disk internal;
on server1 {
address 10.0.0.1:7789;
}
on server2 {
address 10.0.0.2:7789;
}
}
dd command use for the test:
dd bs=1M count=1024 if=/dev/zero of=test conv=fdatasync
The dd result we can get is around 30MB/s - 34MB/s
If we run the test on the host in DRBD + LVM partition. We could get 75MB/s - 78MB/s
Is there any way we can improve it without adding/changing hardward?
I saw someone using this kind of setup XEN+LVM+DRBD+SOFTWARE RAID 1, will that make any different?
Regards
Louis
*
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