急！请教章博士

章博士：你好！我建立了一个LVS/DR方式的ＦＴＰ集群，基本配置为一台ＬＢ调度器，后台五台真实服务器，真实服务器下连接的为ＮＦＳ文件系统存储,存储中有10000个文件。操作系统都为SUSE 9(内核2.6.5).调度器的调度脚本为：
# Stopping the ip_forward for the secure reason,if you need ip_forward ,you can
# ENABLE it,1 for ENABLE ,0 for DISABLE
echo 0 > /proc/sys/net/ipv4/ip_forward

# Because in the LVS/DR, direcotr is not a gw for realserver ,so we use icmp
# to redirects on, 1 for on ,0 for off
echo "1" > /proc/sys/net/ipv4/conf/all/send_redirects
echo "1" > /proc/sys/net/ipv4/conf/default/send_redirects
echo "1" > /proc/sys/net/ipv4/conf/eth1/send_redirects

# Configging the VIP for the eth1:110,the netmask must be 0xffffffff
# eth1 ip 174.19.200.11
/sbin/ifconfig eth1:1 174.19.200.1 broadcast 174.19.200.1 netmask 255.255.255.255 up
/sbin/route add -host 174.19.200.1 dev eth1:1

# Listing ifconfig information for VIP
sbin/ifconfig eth1:1

# Clearing ipvsadm table
/sbin/ipvsadm -C

## Installing LVS services with ipvsadm
# Adding ftp to VIP with wlc scheduling
/sbin/ipvsadm -A -t 174.19.200.1:ftp -p -s wlc

# Forwarding ftp to realserver using direct routing with with weight=1
/sbin/ipvsadm -a -t 174.19.200.1:ftp -r 174.19.200.3 -w 5 -g

# Forwarding ftp to realserver using direct routing with with weight=1
/sbin/ipvsadm -a -t 174.19.200.1:ftp -r 174.19.200.9 -w 5 -g

# Forwarding ftp to realserver using direct routing with with weight=1
/sbin/ipvsadm -a -t 174.19.200.1:ftp -r 174.19.200.10 -w 5 -g

# Forwarding ftp to realserver using direct routing with with weight=1
/sbin/ipvsadm -a -t 174.19.200.1:ftp -r 174.19.200.12 -w 5 -g

# Forwarding ftp to realserver using direct routing with with weight=1
/sbin/ipvsadm -a -t 174.19.200.1:ftp -r 174.19.200.13 -w 5 -g

# Listing ipvsadm table
/sbin/ipvsadm

真实服务器的脚本为：
# Setting realserver ip_forwarding to OFF(1 on,0 off)
echo "0" > /proc/sys/net/ipv4/ip_forward

# Installing realserver_vip
/sbin/ifconfig lo:1 174.19.200.1 broadcast 174.19.200.1 netmask 0xffffffff up

# Installing route for VIP 174.19.200.1 on device lo:1
/sbin/route add -host 174.19.200.1 dev lo:1

# Configging output
/sbin/ifconfig lo:1

# Listing routing information for VIP 174.19.200.1
/bin/netstat -rn

# Hiding interface lo:1,will not arp
echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce
echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" > /proc/sys/net/ipv4/conf/lo/rp_filter

我用LoadRunner(测试工具)测试，模拟4000个用户/每秒去取存储中的文件，每个真实服务器平均分担近1000个用户访问．开始时是100个用户，然后每秒递增10个用户，最终达到每秒4000个用户每秒的访问速度．达到4000个用户每秒的速度后能够运行20分钟左右，然后就出现连接不上的错误和Type failed错误,且一直增长下去.连续几个实验都是相同的问题.我们怀疑是操作系统未优化出现错误,于是对vsftp,内核进程数等做了相应的优化.结果还是同样的问题.
我们不用调度器直接对单台真实服务器进行测试，发现每个真实服务器能够提供2000个用户的访问且能长时间稳定运行。
最后加上调度器后对一台真实服务器做DR调度，模拟1000个用户访问发现出现以前出现的错误。是不是在LVS的调度算法中的参数与调度的服务的设置有关系,如persistent等.