[Linux-cluster] GFS or Web Server Performance issues?

[isplist at logicore.net]

> 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

Do you mean such as a session, so that the user is not moved between servers? 
That's something I did take into account when building the LVS LB's. I also 
have tested with the LVS and direct to the web nodes. The performance is just 
not what I expected but mind you, I've not done any fine tuning yet. 

Are there a series of steps I should be taking? I see a lot on the net but 
it's not too clear which things I really should try doing first.

Mike



> 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)
>> 
>> 
>> --
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