典型的几个负载均衡算法PPT课件
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Clients Router BIG-IP Controller
2021/3/7
101 102
Servers
14ms 15ms 20ms 11ms Current Response Times
7
Load Balancing – Least Connection
Internet
Next requests goes to Node with fewest number of connections
Internet
Clients
Administrator sets ratio for distributing Client requests 3:1:1:1
Router BIG-IP Controller
2021/3/7
1 23 4
5
6
7 8 9 10
11
12
Servers
3
Load Balancing – Minimum Active Members
Internet
Clients
The number of members that must be active in a priority group in order for the BIG-IP Controller to send its requests to that group
Router
Load Balancing Modes
Static Modes:
round_robin ratio
Failure Mechanisms:
minimum active members
fallback Host
Dynamic Modes:
least_connection fastest observed predictive dynamic Ratio
Clients Router BIG-IP Controller
2021/3/7
61 62
342 330 338 335 Current Connections
Servers
9
Load Balancing – Observed
Internet
Next requests goes to Node with combination of fewest connections and best response
Clients Router BIG-IP Controller
2021/3/7
1 2
462 460 455 465 Current Connections
Servers
8
Load Balancing – Least Connection
Internet
Next requests goes to Node with fewest number of connections
2021/3/7
1 2
Clients Router BIG-IP Controller
Servers
11
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2021/3/7
1 2
Clients
Router BIG-IP Controller
Servers
10
Load Balancing – Predictive
Internet
Next requests goes to Node with combination of fewest connections and best response over time
2021/3/7
1
Load Balancing – Round Robin
Internet
Clients
Client requests are distributed evenly
Router BIG-IP Controller
2021/3/7
1
2
3
4
5
6
7
8
Servers
2
Load Balancing - Ratio
BIG-IP Controller
Priority 2
Priority 1
1
2
35 4 6
Servers
2021/3/7 Minimum Active Members = 2
4
Load Balancing – Minimum Active Members
Internet
Clients
If the number of active members falls below this number, requests are sent to the next highest priority group
Priority 2
Routຫໍສະໝຸດ Baidur
BIG-IP Controller Priority 1
1
2
3
4
5
6 Servers
2021/3/7 Minimum Active Members = 2
5
Load Balancing - Fastest
Internet
Next requests go to Node with shortest response time
Clients Router BIG-IP Controller
2021/3/7
1
Servers
2
10ms 5ms 20ms 17ms Current Response Times
6
Load Balancing - Fastest
Internet
Next requests go to Node with shortest response time