I have an existing 4.2 setup with 2 hosts, both with a quad-gbit NIC and
a QNAP TS-569 Pro NAS with twin gbit NIC and five 7k2 drives. At
present, the I have 5 VLANs, each with their own subnet as:
1. my "main" net (VLAN 1, 172.16.7.0/24)
2. ovirtmgmt (VLAN 100, 192.168.100.0/24)
3. four storage nets (VLANs 101-104, 192.168.101.0/24 - 192.168.104.0/24)
On the NAS, I enslaved both NICs into a 802.3ad LAG and then bound an IP
address for each of the four storage nets giving me:
* bond0.101@bond0: 192.168.101.101
* bond0.102@bond0: 192.168.102.102
* bond0.103@bond0: 192.168.103.103
* bond0.104@bond0: 192.168.104.104
The hosts are similar, but with all four NICs enslaved into a 802.3ad LAG:
Host 1:
* bond0.101@bond0: 192.168.101.203
* bond0.102@bond0: 192.168.102.203
* bond0.103@bond0: 192.168.103.203
* bond0.104@bond0: 192.168.104.203
Host 2:
* bond0.101@bond0: 192.168.101.204
* bond0.102@bond0: 192.168.102.204
* bond0.103@bond0: 192.168.103.204
* bond0.104@bond0: 192.168.104.204
I believe my performance could be better though. While running bonnie++
on a VM, the NAS reports top disk throughput around 70MB/s and the
network (both NICs) topping out around 90MB/s. I suspect I'm being hurt
by the load balancing across the NICs. I've played with various load
balancing options for the LAGs (src-dst-ip and src-dst-mac) but with
little difference in effect. Watching the resource monitor on the NAS,
I can see that one NIC almost exclusive does transmits while the other
is almost exclusively receives. Here's the bonnie report (my apologies
to those reading plain-text here):
Bonnie++ Benchmark results
*Version 1.97* *Sequential Output* *Sequential Input* *Random
Seeks*
*Sequential Create* *Random Create*
Size Per Char Block Rewrite Per Char Block
Num Files Create
Read Delete Create Read Delete
K/sec % CPU K/sec % CPU K/sec % CPU K/sec % CPU K/sec
% CPU
/sec % CPU
/sec % CPU /sec % CPU /sec % CPU /sec % CPU /sec
% CPU /sec
% CPU
unamed 4G 267 97 75284 21 22775 8 718 97
43559 7 189.5 8
16 6789 60 +++++ +++ 24948 75 14792 86 +++++
+++ 18163 51
Latency 69048us 754ms 898ms 61246us 311ms 1126ms
Latency 33937us
1132us 1299us 528us 22us 458us
I keep seeing MPIO mentioned for iSCSI deployments and now I'm trying to
get my head around how to best set that up or to even know if it would
be helpful. I only have one switch (a Catalyst 3750g) in this small
setup so fault tolerance at that level isn't a goal.
So... what would the recommendation be? I've never done MPIO before but
know where it's at in the web UI at least.
--
John Florian
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