No traffic to Pool Members , predictive (member).

Is there any persistence applied to the VIP? Are their Monitors applied to the Pool Members? How about posting your VIP and Pool configuration directives.

Hi Thanks for the response. This is the persistence profile that is applied. I have added 2 screenshots

And yes there a is monitor applied.

A few observations:

1. A hash persistence profile, like the universal persistence profile, is generally reliant on an iRule to manage the payload content used for persistence. Without an iRule there's nothing really to persist on. I couldn't say for certain, but the presence of this profile without an iRule may be causing the uneven loading. If this VIP is used with standard browser clients, your best bet and arguably the most reliable option is to use cookie insert persistence.

    

2. If all members in a pool have the same priority group activation value, then priority group adds no value.

    

3. The predictive load balancing algorithm, while very powerful, will consume additional system resources which is usually unwarranted for most applications that will work splendidly with the least connections method.

    

i agree with Kevin i.e. hash persistence profile with no irule.

e.g.

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.20.15:80
    ip-protocol tcp
    mask 255.255.255.255
    persist {
        hash {
            default yes
        }
    }
    pool foo
    profiles {
        http { }
        tcp { }
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    vs-index 34
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm pool foo
ltm pool foo {
    load-balancing-mode predictive-member
    members {
        200.200.200.101:80 {
            address 200.200.200.101
        }
        200.200.200.111:80 {
            address 200.200.200.111
        }
    }
}

 hash persistence with no irule

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm persistence hash
ltm persistence hash hash {
    app-service none
    mirror disabled
    rule none
    timeout 180
}

 generate 100 requests

[root@centos20 ~] ab -n 100 http://172.28.20.15/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 2006 The Apache Software Foundation, http://www.apache.org/

Benchmarking 172.28.20.15 (be patient).....done


Server Software:        Apache/2.2.3
Server Hostname:        172.28.20.15
Server Port:            80

Document Path:          /
Document Length:        89 bytes

Concurrency Level:      1
Time taken for tests:   0.766123 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      35100 bytes
HTML transferred:       8900 bytes
Requests per second:    130.53 [/sec] (mean)
Time per request:       7.661 [ms] (mean)
Time per request:       7.661 [ms] (mean, across all concurrent requests)
Transfer rate:          44.38 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   0.3      1       2
Processing:     4    6   2.8      5      20
Waiting:        3    5   2.8      5      19
Total:          4    7   2.9      6      21

Percentage of the requests served within a certain time (ms)
  50%      6
  66%      7
  75%      7
  80%      8
  90%      9
  95%     14
  98%     20
  99%     21
 100%     21 (longest request)

 only 1 persistence record

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) show ltm persistence persist-records all-properties
Sys::Persistent Connections
hash - 172.28.20.15:80 - 200.200.200.101:80
-------------------------------------------
  TMM           0
  Mode          hash
  Value         0
  Age (sec.)    38
  Virtual Name  /Common/bar
  Virtual Addr  172.28.20.15:80
  Node Addr     200.200.200.101:80
  Pool Name     /Common/foo
  Client Addr   172.28.20.20
  Owner entry

Total records returned: 1

 only 1 pool member is selected

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) show ltm pool foo members

---------------------------------------------------------------------
Ltm::Pool: foo
---------------------------------------------------------------------
Status
  Availability : unknown
  State        : enabled
  Reason       : The children pool member(s) either don't have service checking enabled, or service check results are not available yet
  Monitor      : none
  Minimum Active Members : 0
  Current Active Members : 0
          Total Requests : 100
        Current Sessions : 0

Traffic                                  ServerSide
  Bits In                                    325.6K
  Bits Out                                   492.0K
  Packets In                                    600
  Packets Out                                   500
  Current Connections                             0
  Maximum Connections                             2
  Total Connections                             100

Connection Queue                               Pool  Pool and members
  Number of connections queued now                0                 0
  Number of connections serviced                  0                 0
  Queue head entry age (ms)                       0                 0
  Maximum queue entry age ever (ms)               0                 0
  Maximum queue entry age recently (ms)           0                 0
  Average queue entry age (ms)                    0                 0

  --------------------------------------------------------------
  | Ltm::Pool Member: 200.200.200.101:80
  --------------------------------------------------------------
  | Status
  |   Availability   : unknown
  |   State          : enabled
  |   Reason         : Pool member does not have service checking enabled
  |   Monitor        : none
  |   Monitor Status : unchecked
  |   Session Status : enabled
  |   Pool Name      : foo
  |   IP Address     : 200.200.200.101
  |
  | Traffic                                  ServerSide  General
  |   Bits In                                    325.6K        -
  |   Bits Out                                   492.0K        -
  |   Packets In                                    600        -
  |   Packets Out                                   500        -
  |   Current Connections                             0        -
  |   Maximum Connections                             2        -
  |   Total Connections                             100        -
  |   Total Requests                                  -      100
  |   Current Sessions                                -        0
  |
  | Connection Queue
  |   Number of connections queued now                0
  |   Number of connections serviced                  0
  |   Queue head entry age (ms)                       0
  |   Maximum queue entry age ever (ms)               0
  |   Maximum queue entry age recently (ms)           0
  |   Average queue entry age (ms)                    0

  --------------------------------------------------------------
  | Ltm::Pool Member: 200.200.200.111:80
  --------------------------------------------------------------
  | Status
  |   Availability   : unknown
  |   State          : enabled
  |   Reason         : Pool member does not have service checking enabled
  |   Monitor        : none
  |   Monitor Status : unchecked
  |   Session Status : enabled
  |   Pool Name      : foo
  |   IP Address     : 200.200.200.111
  |
  | Traffic                                  ServerSide  General
  |   Bits In                                         0        -
  |   Bits Out                                        0        -
  |   Packets In                                      0        -
  |   Packets Out                                     0        -
  |   Current Connections                             0        -
  |   Maximum Connections                             0        -
  |   Total Connections                               0        -
  |   Total Requests                                  -        0
  |   Current Sessions                                -        0
  |
  | Connection Queue
  |   Number of connections queued now                0
  |   Number of connections serviced                  0
  |   Queue head entry age (ms)                       0
  |   Maximum queue entry age ever (ms)               0
  |   Maximum queue entry age recently (ms)           0
  |   Average queue entry age (ms)                    0