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Re: Our LVS/DR backends freezes

To: =?x-unknown?q?Olle_=D6~Vstlund?= <olle@xxxxxxxxxxx>, Horms <horms@xxxxxxxxxxxx>
Subject: Re: Our LVS/DR backends freezes
Cc: "LinuxVirtualServer.org users mailing list." <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
From: Joseph Mack NA3T <jmack@xxxxxxxx>
Date: Tue, 28 Nov 2006 09:45:22 -0800 (PST)
On Tue, 28 Nov 2006, Olle ~Vstlund wrote:

Look for yourself. These are figures from the director when all
realservers are open (weight = 10)

IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
 -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.3.10:80 wrr
 -> 192.168.3.105:80             Route   10     755        33987
 -> 192.168.3.107:80             Route   10     842        35426

These are figures from the director when the realserver with interfaces
192.168.3.5 and 192.168.3.105 have been closed (weight = 0) for 5
minutes:

IP Virtual Server version 1.2.0 (size=4096)
Prot LocalAddress:Port Scheduler Flags
 -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.3.10:80 wrr
 -> 192.168.3.105:80             Route   0      623        33687
 -> 192.168.3.107:80             Route   10     929        36252

-----------------------
192.168.3.105  NONE            45 (max/mean expire time 59/31)
192.168.3.105  FIN_WAIT     15534 (max/mean expire time 113/29)
192.168.3.105  ESTABLISHED    623 (max/mean expire time 600/36)
192.168.3.105  CLOSE        18125 (max/mean expire time 59/29)
192.168.3.105  SYN_RECV        14 (max/mean expire time 59/24)
-----------------------


OK machine x.x.x.105 has its weight changed to 0 and the InActConn hardly drops in 5 minutes. The netstat figures on the realservers after 5 mins of inactivity still show a lot of CLOSE and FIN_WAIT. These should all be gone. Presumably this is not happening with the standalone server?

BTW: how many connections does a client open to fetch a Tomcat page? Is is about half a dozen like with apache/http/html or is is 33687/623 = 50? (still the InActConn shoud expire).

I'm stumped.

Horms - any ideas?

Joe

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Joseph Mack NA3T EME(B,D), FM05lw North Carolina
jmack (at) wm7d (dot) net - azimuthal equidistant map
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