CSS 11500 Series LOGs

Question

Hi everyone,
I need some help about one type of CSS 11500 LOG messages:
OCT 12 07:47:03 1/1 273 WCC-6: Computing slow start parameters for newly activated service index 4
OCT 12 10:25:05 1/1 274 WCC-6: Computing slow start parameters for newly activated service index 3
OCT 12 11:19:49 1/1 275 WCC-6: Computing slow start parameters for newly activated service index 3
OCT 12 11:26:33 1/1 276 WCC-6: Computing slow start parameters for newly activated service index 3
OCT 12 12:20:37 1/1 277 WCC-6: Computing slow start parameters for newly activated service index 3
OCT 12 14:04:32 1/1 278 WCC-6: Computing slow start parameters for newly activated service index 4
OCT 12 14:04:53 1/1 279 WCC-6: Computing slow start parameters for newly activated service index 5
OCT 12 14:05:01 1/1 280 WCC-6: Computing slow start parameters for newly activated service index 4
I was trying to find some explanation about these LOGs, but I didn’t have any success.
My questions are:
1. What does this LOG type mean?
2. Does it signalize some issue on the service?
Thanks a lot for the help!
Regards,
Marko

Answer 1

Hi Marko,
Please go through the below link:
http://www.cisco.com/en/US/docs/app_ntwk_services/data_center_app_services/css11500series/v8.20/configuration/content_lb/guide/ContRule.html#wpmkr1150644
Just pasting some content. Read the details please.
Slowly Starting Connections on a Service
When you configure a content rule with the least connection (leastconn) load-balancing method, a service on the rule with the fewest connections receives the next request. If you activate a service on this rule, the service may become flooded with requests.
To prevent the flooding of connections on a newly activated or reactivated service, you can enable the slow-start feature on a content rule configured with the leastconn load-balancing method. Through this feature, you can configure:
•The rate that an activated service receives connections. The slow-start rate is applied globally to all leastconn content rules on the CSS. By default, the rate is enabled with a default value of 3. If you disable the rate by setting it to 0, the slow-start feature is disabled on all leastconn content rules configured on the CSS.
Note We recommend that you do not change the slow-start rate default value.
•The maximum time that the service remains in the slow-start process. The slow-start timer sets the number of seconds that the service on a leastconn content rule is in the slow-start process. The timer is applied to a leastconn content rule. By default, the timer is disabled. If the timer is disabled, the slow-start feature is disabled on the rule.
When you enable the slow-start feature on the CSS and a leastconn rule, a service on the rule enters the slow-start process when you:
•Add and activate a service to the rule
•Reactivate a service after suspending it on the rule
•Activate the rule
When you activate a rule, it starts to load balance the connections on its services. The service with the least number of connections is selected to enter the slow-start process.
When a rule has only two services, only one service can enter the slow-start process. When the rule has more than two services, a newly activated service can enter the slow-start process when one of the services is currently in the slow-start process and the other services are out of the slow-start process.
A service in the slow-start process slowly continues to receive connections until either the slow-start timer expires or its connections equal the number of connections on the other active services of the rule. Then, the service exits the slow-start process and starts receiving connections as it normally would.
Regards,
Kanwal