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.
> 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.
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