Re: how does LVS persistence work?
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On Tue, Oct 18, 2011 at 11:26:43PM +0200, Tomasz Chmielewski wrote: > According to http://www.linuxvirtualserver.org/docs/persistence.html: > > In the persistent port, when a client first accesses the > service, LinuxDirector will create a connection template > between the given client and the selected server, then create > an entry for the connection in the hash table. The template > expires in a configurable time, and the template won't expire > until all its connections expire. > > > Suppose I have two real servers and persistence set to 30 minutes. > > > How will LVS persistence behave for a client which first connects at 01:00? > > 1) persistence is always "first connected + 30 minutes". > > When the client connects at 01:00, LVS sets persistence to 30 minutes. > All connections from this client, between 01:00-01:30 will be > directed to one server. > At ~01:31, persistence will expire and will be set again; it's > possible that the client will hit the other server, even though the > last connection was made at 01:29. > > Meaning - if the client makes one short connection every 25 minutes > and persistence is set to 30 minutes, the chances are it will hit a > different server (almost) every time. > > lvs-devel@xxxxxxxxxxxxxxx > 2) persistence is always extended and is "last connection + 30 minutes". > > In other words - if the client makes one short connection every 25 > minutes and persistence is set to 30 minutes, it is practically > guaranteed the client will always hit the same server. > > > Which one is true, 1) or 2)? 2) is true. -- To unsubscribe from this list: send the line "unsubscribe lvs-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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