Alteon 180e VIP Problem

Alteon 180e VIP Problem

Post by Leeroy Jee » Thu, 22 Dec 2005 20:06:11


i All

Im having an issue with 1 specific VIP on my alteon 180e. The problem
is as follows:

Under periods of high(ish) load, one specific VIP seems to have trouble
loadbalancing. Every few seconds HTTP requests to that VIP take about
3.2 seconds to reply instead of the usual <200ms. When we graph the
HTTP request times, we can see the spikes occuring but the srange thing
is that the spikes are exactly the same height. ie. when the request
time slows down, it slows to the exact same time as the last spike
(about 3.2 seconds.) The web servers themselves are barely under any
load at all during this time. If we check HTP response times to the
Real IPs of the webservers, there is no slow down at all. The servers
are plugged directly into a port each on the Alteon.
We experience no other issues on any of the other VIPs.

The setup looks like this:
There are 2 webservers. Each webserver has 10 ip addresses configured
for 1 NIC. There are 10 websites running on each Webserver. We
therefore have 10 VIPS on the alteon. Each VIP contains 2 Real Ip
addresses in its group (One address from each webserver.)

Any help will be greatly apreciated - and dont be scared to point out
the obvious as this is the 1st time I'm dealing with Alteons.

The following is a copy of my config file with IPs and Mac`s changed to
garbage. The problem is occuring with the VIP at group 9.

script start "Alteon 180e" 4 /**** DO NOT EDIT THIS LINE!
/* Configuration dump taken 15:00:05 Tue Aug 23, 2005
/* Version 10.0.30, Base MAC address nn:yy:cf:xx:tt:c0
/c/sys
/c/sys/user
admpw "9xxxxxxxxxxxxb6fff6a343xxxxxxxxxx3ff676fbxxxxxxxxxxxba2xxxx1e"
/c/stp 1/off
/c/sys/syslog
host 55.66.xx.185
sever 0
/c/sys/sshd/on
/c/ip/if 1
ena
addr 10.0.xx.2
/c/slb
on
/c/slb/adv
direct ena
slowage 7
/c/slb/real 1
ena
rip 10.0.xx.7
/c/slb/real 2
ena
rip 10.0.xx.8
/c/slb/real 3
ena
rip 10.0.xx.5
/c/slb/real 4
ena
rip 10.0.xx.6
/c/slb/real 5
ena
rip 10.0.xx.121
/c/slb/real 6
ena
rip 10.0.xx.141
/c/slb/real 7
ena
rip 10.0.xx.122
/c/slb/real 8
ena
rip 10.0.xx.142
/c/slb/real 9
ena
rip 10.0.xx.123
/c/slb/real 10
ena
rip 10.0.xx.143
/c/slb/real 11
ena
rip 10.0.xx.124
/c/slb/real 12
ena
rip 10.0.xx.144
/c/slb/real 13
ena
rip 10.0.xx.125
/c/slb/real 14
ena
rip 10.0.xx.145
/c/slb/real 15
ena
rip 10.0.xx.126
/c/slb/real 16
ena
rip 10.0.xx.146
/c/slb/real 17
ena
rip 10.0.xx.127
/c/slb/real 18
ena
rip 10.0.xx.147
/c/slb/real 19
ena
rip 10.0.xx.130
/c/slb/real 20
ena
rip 10.0.xx.150
/c/slb/group 1
metric roundrobin
add 1
add 2
/c/slb/group 2
metric roundrobin
add 3
add 4
/c/slb/group 3
metric roundrobin
add 5
add 6
/c/slb/group 4
metric roundrobin
add 7
add 8
/c/slb/group 5
metric roundrobin
add 9
add 10
/c/slb/group 6
metric roundrobin
add 11
add 12
/c/slb/group 7
metric roundrobin
add 13
add 14
/c/slb/group 8
metric roundrobin
add 15
add 16
/c/slb/group 9
metric roundrobin
add 17
add 18
/c/slb/group 10
metric roundrobin
add 19
add 20
/c/slb/group 12
metric roundrobin
add 3
add 4
/c/slb/port 1
client ena
/c/slb/port 2
client ena
server ena
/c/slb/port 3
client ena
server ena
/c/slb/port 7
client ena
server ena
/c/slb/port 8
client ena
server ena
/c/slb/virt 1
ena
vip 10.0.xx.71
/c/slb/virt 1/service 7001
group 1
dbind ena
/c/slb/virt 2
en