isplist@xxxxxxxxxxxx wrote:
Here is ab sending a test to an LVS server in front of a 3 node web server. The average loads on each server was around 8.00 to 10.00. These aren't very good numbers and I'm wondering where to start looking.
Using a load balancer in front of GFS nodes is tricky. Make sure to set your scheduling rule (or whatever it is called in LVS) in such a way that it would not generate un-necessary lock traffic. For example, you don't want the same write lock to get rotated between three nodes. Be aware that moving a write lock between nodes requires many steps that include a disk flush.
-- Wendy
These are pretty much default apache RPM versions out of the box. # ab -kc 50 -t 30 http://192.168.1.150/ This is ApacheBench, Version 2.0.41-dev <$Revision: 1.141 $> apache-2.0 Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/ Benchmarking 192.168.1.150 (be patient) Finished 130 requests Server Software: Apache Server Hostname: 192.168.1.150 Server Port: 80 Document Path: / Document Length: 8997 bytes Concurrency Level: 50 Time taken for tests: 30.234185 seconds Complete requests: 130 Failed requests: 0 Write errors: 0 Keep-Alive requests: 0 Total transferred: 1371090 bytes HTML transferred: 1299586 bytes Requests per second: 4.30 [#/sec] (mean) Time per request: 11628.532 [ms] (mean) Time per request: 232.571 [ms] (mean, across all concurrent requests) Transfer rate: 44.25 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 1 1.4 2 4 Processing: 409 6228 4357.5 5227 16317 Waiting: 369 6146 4370.8 5199 16261 Total: 409 6230 4358.1 5230 16321 Percentage of the requests served within a certain time (ms) 50% 5230 66% 8331 75% 9310 80% 10386 90% 12820 95% 14502 98% 15399 99% 15746 100% 16321 (longest request) -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
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