{"id":2657,"date":"2010-02-25T00:13:33","date_gmt":"2010-02-25T05:13:33","guid":{"rendered":"http:\/\/g33kinfo.com\/info\/?p=2657"},"modified":"2010-02-25T00:13:33","modified_gmt":"2010-02-25T05:13:33","slug":"round-robin-vs-weighted-round-robin-lb","status":"publish","type":"post","link":"https:\/\/g33kinfo.com\/info\/round-robin-vs-weighted-round-robin-lb\/","title":{"rendered":"Round Robin vs. Weighted Round Robin LB"},"content":{"rendered":"

The round-robin algorithm is often used as a simple-yet-effective method of distributing requests to a single-point-of-entry to multiple servers in the background. It’s used by DNS servers, peer-to-peer networks, and many other multiple-node clusters\/networks.<\/p>\n

In a nutshell, round-robin algorithms pair an incoming request to a specific machine by cycling (or, more specifically, circling) through a list of servers capable of handling the request. It’s a common solution to many network load balancing needs, even though it does not result in a perfectly-balanced load distribution, strictly speaking.<\/p>\n

Weighted round-robin provides a clean and effective way of focusing on fairly distributing the load amongst available resources, verses attempting to equally distribute the requests. In a weighted round-robin algorithm, each destination (in this case, server) is assigned a value that signifies, relative to the other servers in the pool, how that server performs. This “weight” determines how many more (or fewer) requests are sent that server’s way; compared to the other servers on the pool.<\/p>\n

Say you have three servers that have been individually benchmarked and configured that are to be deployed in a weighted round-robin environment. The
\nfirst can handle 100 req\/sec, the second can do 300 req\/sec, and the last can only do 25 req\/sec (all on average, tested with an automated benchmark serving
\nthe same data). Normally, with such a discrepancy in the servers’ performance, the third would be excluded from the setup entirely. But in a weighted round-robin, each server can be assigned as much as it can handle in the round-robin configuration script\/file:<\/p>\n

Resource Weight
\n——– ——
\nserver1.fqdn 4
\nserver2.fqdn 12
\nserver3.fqdn 1<\/p>\n

It’s pretty clear what happens next: for every 12 requests sent to server two, 4 will be sent to server one, and just 1 will be sent to server 3. The result is a more even, if less equal, load distribution.<\/p>\n

So in a nutshell, Weighted Round Robin works in a similar way to Round Robin, but assigns more requests to nodes with a greater ‘weight’. Over a period of time, nodes will receive a number of requests in proportion to their weight.<\/p>\n

Weights must be positive integer values; a node with a weight of ‘4’ will receive 4 times as many requests as a node with a weight of ‘1’. <\/p>\n

http:\/\/neosmart.net<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

The round-robin algorithm is often used as a simple-yet-effective method of distributing requests to a single-point-of-entry to multiple servers in the background. It’s used by DNS servers, peer-to-peer networks, and many other multiple-node clusters\/networks. In a nutshell, round-robin algorithms pair an incoming request to a specific machine by cycling (or, more specifically, circling) through a… <\/p>\n

Read More<\/i><\/a><\/div>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-2657","post","type-post","status-publish","format-standard","hentry","category-info"],"yoast_head":"\nRound Robin vs. Weighted Round Robin LB - Linux Shtuff<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/g33kinfo.com\/info\/round-robin-vs-weighted-round-robin-lb\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Round Robin vs. Weighted Round Robin LB - Linux Shtuff\" \/>\n<meta property=\"og:description\" content=\"The round-robin algorithm is often used as a simple-yet-effective method of distributing requests to a single-point-of-entry to multiple servers in the background. 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