Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual download pdf (Page 74)

62 ServerIron ADX Advanced Server Load Balancing Guide

53-1002435-01

Other TCS options

This example assumes that a source IP address is configured and Source NAT and Destination NAT

also are enabled, if applicable.

Shutting down a cache server

The force shutdown feature (sometimes called the force delete feature) allows you to force

termination of existing SLB connections. This feature assumes that you already have shut down a

TCP/UDP service on the real server or you have shut down the real server itself.

There are several methods for shutting down a cache server. Some methods involve changing the

ServerIron ADX configuration while other methods involve shutting down the cache server itself.

Each method has consequences, so choose the method that works best in your situation.

• Edit the cache server configuration on the ServerIron ADX to disable the HTTP (or other) port

on the server. For example, to disable port 80 (HTTP), you can use the port http disable

command at the cache level of the CLI. If you use this method, you do not need to re-define the

cache server to add the server back to TCS. However, you do need to re-enable the disabled

TCP/UDP ports.

Although the HTTP port is disabled in the ServerIron ADX definition of the cache server, all the

sites mapped to the cache server before the port was disabled remain mapped to the cache

server. When the cache server comes back up, it gets the same traffic it used to have. While

the cache server is disabled, the remaining cache servers temporarily handle caching for the

down cache server’s sites, but stop when the cache is restored. This behavior is the same as if

the cache actually died.

NOTE

You might need to set the maximum connections parameter for the remaining cache servers,

especially if the servers already run at a high percentage of their capacity when all cache

servers are available. Refer to “Configuring maximum connections for a cache server” on

page 59.

• Delete the cache server from the ServerIron ADX. This option immediately prevents new

connections. The ServerIron ADX ends existing connections after two minutes or, if you have

enabled the force shutdown option, immediately.

Do not use this method unless you have only one cache server. If you use this method, to

re-add the cache server to the ServerIron ADX, you must redefine the cache server and

re-assign it to a cache group. Moreover, because the ServerIron ADX uses a hashing function to

allocate contents among cache servers, the ServerIron ADX allocates traffic to the remaining

caches. If the deleted cache server is down for a while in a busy network, the traffic might be

unevenly balanced between the cache server tat was down and the other cache servers. To

reset the hash function and thus rebalance the serving load, you need to reboot the ServerIron

ADX.

• Shut down the cache server itself, rather than change definitions on the ServerIron ADX. When

the cache server stops responding to health checks, the ServerIron ADX removes the server

from TCS. If you have only one cache server, user traffic is switched at Layer 2 to the Internet

until the cache server comes back. If you have more than one cache server, the remaining

cache servers provide service until the disabled cache server comes back.

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 135 136

Comments to this Manuals

No comments

Brocade Communications Systems ServerIron ADX 12.4.00 Service Manual Page 74

Comments to this Manuals

Related products and manuals for Network switches Brocade Communications Systems ServerIron ADX 12.4.00