对Plesk LAMP专用服务器上的高负载进行故障排除

我有2个具有相同提供程序的几乎完全相同的专用服务器。他们还运行几乎相同的软件堆栈:RedHat 5 64位,Plesk,PHP,Apache和MySQL。我们使用它们托管我们构建的自定义网站。

问题是,虽然我们的第一台服务器的平均负载(顶部)约为0.3,但第二台服务器的平均负载始终约为4.0或更高。执行Shell命令时,Plesk中的基本功能会延迟并且会有一些延迟。

任何人都有想法为什么会这么高?为什么它与我们的其他服务器有如此大的差异?

这是我当前的最高输出(按%MEM排序)...

任何帮助深表感谢 ...

top - 21:48:04 up 100 days,  4:28,  1 user,  load average: 3.74, 4.20, 4.23
Tasks: 336 total,   1 running, 335 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.8%us,  0.4%sy,  0.0%ni, 91.3%id,  7.5%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  12290884k total, 11886452k used,   404432k free,  2920212k buffers
Swap:  2096472k total,      244k used,  2096228k free,  6560692k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                               
22536 apache    15   0  860m 547m 6484 S  0.0  4.6   0:10.96 httpd                                                                                                                  
26467 apache    15   0  859m 546m 6408 S  0.0  4.5   0:07.67 httpd                                                                                                                  
 3620 apache    15   0  859m 545m 5552 S  0.0  4.5   0:06.15 httpd                                                                                                                  
 1895 apache    15   0  858m 544m 6356 S  0.0  4.5   0:08.25 httpd                                                                                                                  
16933 apache    15   0  858m 544m 5488 S  0.0  4.5   0:01.57 httpd                                                                                                                  
 6431 apache    15   0  856m 542m 6076 S 10.6  4.5   0:05.32 httpd                                                                                                                  
14417 apache    15   0  856m 542m 5568 S  0.0  4.5   0:03.88 httpd                                                                                                                  
15403 apache    15   0  855m 541m 5616 S  0.0  4.5   0:03.73 httpd                                                                                                                  
19165 apache    15   0  853m 539m 6252 S  0.0  4.5   0:12.40 httpd                                                                                                                  
15898 apache    15   0  852m 539m 5376 S  0.0  4.5   0:02.68 httpd                                                                                                                  
14401 apache    15   0  851m 538m 5460 S  0.0  4.5   0:02.97 httpd                                                                                                                  
15393 apache    15   0  851m 538m 5404 S  0.0  4.5   0:03.12 httpd                                                                                                                  
15427 apache    15   0  851m 538m 5496 S  0.0  4.5   0:02.44 httpd                                                                                                                  
14412 apache    15   0  851m 538m 5324 S  0.0  4.5   0:02.15 httpd                                                                                                                  
18330 apache    15   0  851m 537m 5136 S  0.0  4.5   0:01.30 httpd                                                                                                                  
18303 apache    15   0  848m 535m 5140 S  0.0  4.5   0:00.47 httpd                                                                                                                  
21190 apache    15   0  845m 533m 3988 S  0.0  4.4   0:00.33 httpd                                                                                                                  
15923 root      18   0  822m 521m 9928 S  0.0  4.3  10:04.81 httpd                                                                                                                  
22021 apache    15   0  828m 520m 4964 S  0.0  4.3   0:00.16 httpd                                                                                                                  
22146 apache    15   0  823m 515m 3016 S  0.0  4.3   0:00.02 httpd                                                                                                                  
22345 apache    15   0  822m 514m 2408 S  0.0  4.3   0:00.00 httpd                                                                                                                  
14721 apache    15   0  733m 510m  488 S  0.0  4.3   0:00.00 httpd                                                                                                                  
 5094 root      15   0 1452m 122m  15m S  1.0  1.0 852:24.24 java                                                                                                                   
 4636 mysql     15   0  532m  57m 6440 S  1.0  0.5 488:05.84 mysqld                                                                                                                 
 4799 popuser   15   0  166m  53m 2368 S  0.0  0.4   0:36.64 spamd                                                                                                                  
16761 popuser   15   0  159m  46m 2312 S  0.0  0.4   0:00.38 spamd                                                                                                                  
 4797 root      15   0  158m  45m 2448 S  0.0  0.4   0:01.27 spamd                                                                                                                  
 5074 root      34  19  255m  20m 2144 S  0.0  0.2   1:37.53 yum-updatesd                                                                                                           
 9917 named     15   0  366m 9804 1980 S  0.0  0.1   0:10.26 named                                                                                                                  
 4332 sso       18   0  119m 8028 5212 S  0.0  0.1   0:00.06 sw-engine-cgi                                                                                                          
 4341 sso       18   0  119m 8028 5212 S  0.0  0.1   0:00.07 sw-engine-cgi                                                                                                          
 4350 sso       18   0  119m 8028 5212 S  0.0  0.1   0:00.09 sw-engine-cgi                                                                                                          
 4352 sso       18   0  119m 8028 5212 S  0.0  0.1   0:00.11 sw-engine-cgi                                                                                                          
 4376 ntp       15   0 23388 5020 3896 S  0.0  0.0   0:00.58 ntpd                                                                                                                   
 4331 sw-cp-se  15   0 61336 4572 1480 S  0.0  0.0   5:53.22 sw-cp-serverd                                                                                                          
 4213 haldaemo  15   0 31252 4460 1684 S  0.0  0.0   0:01.52 hald                                                                                                                   
 4778 postgres  18   0  117m 4164 3484 S  0.0  0.0   0:00.11 postmaster                                                                                                             
18555 root      16   0 98.3m 3716 2852 S  0.0  0.0   0:00.01 sshd                                                                                                                   
 4488 sso       18   0  119m 3044  224 S  0.0  0.0   0:00.00 sw-engine-cgi                                                                                                          
 4489 sso       18   0  119m 3044  224 S  0.0  0.0   0:00.00 sw-engine-cgi                                                                                                          
 4492 sso       18   0  119m 3044  224 S  0.0  0.0   0:00.00 sw-engine-cgi                                                                                                          
 4493 sso       18   0  119m 3044  224 S  0.0  0.0   0:00.00 sw-engine-cgi                                                                                                          
 4490 sso       18   0  119m 3040  220 S  0.0  0.0   0:00.00 sw-engine-cgi