Hello Nhi,
It¡¯s impossible to have two stateserver services running for state
management. If rebustness is really a concern, we could only use SQL
Server with clustering.
For details, see this FAQ:
http://www.asp.net/Forums/ShowPost.a...=1&PostID=7504
Hope it helps.
Best regards,
yhhuang
VS.NET, Visual C++
Microsoft
This posting is provided "AS IS" with no warranties, and confers no rights.
Got .Net?
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--------------------
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!Sender: "Nhi Lam" <nh****@secretplace.com>
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<Sm**************@cpmsftngxa06.phx.gbl>
!Subject: RE: Session State
!Date: Wed, 25 Jun 2003 10:11:37 -0700
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!Hi Yan-Hong Huang,
!
!Thanks for the response. I can't use the "SQL Server Mode"
!because of performance reasons. So my only option is
!the "Out of Process mode". However, I am concerned that
!when the computer that hosts the stateserver service
!crashes, then all of our users will lose their sessions.
!What I'd like to know is if there's a way to run 2
!computers to host the stateserver service and have them
!replicate the session states among themselves. In this
!way, if one computer crashes, the other one can take over.
!
!Thanks,
!--Nhi Lam
!
!>-----Original Message-----
!>Hello Nhi,
!>
!>From MSDN:
!>StateServer: Alternately, StateServer mode uses a stand-
!alone Microsoft
!>Windows service to store session variables. Because this
!service is
!>independent of Microsoft Internet Information Server
!(IIS), it can run on a
!>separate server. You can use this mode for a load-
!balancing solution
!>because multiple Web servers can share session variables.
!Although session
!>variables are not lost if you restart IIS, performance is
!impacted when you
!>cross process boundaries.
!>
!>So we could just use one stateserver service.
!>
!>When we are considering these three types of ASP.NET
!session state modes,
!>It's worth mentioning, briefly, some of the performance
!and reliability
!>issue.
!>
!>In process:
!>In process will perform best because the session state
!memory is kept
!>within the ASP.NET process. For Web applications hosted
!on a single server,
!>applications in which the user is guaranteed to be re-
!directed to the
!>correct server, or when session state data is not
!critical (in the sense
!>that it can be re-constructed or re-populated), this is
!the mode to choose.
!>
!>Out of process:
!>This mode is best used when performance is important but
!you can't
!>guarantee which server a user will request an application
!from. With
!>out-of-process mode, you get the performance of reading
!from memory and the
!>reliability of a separate process that manages the state
!for all servers.
!>
!>SQL Server:
!>This mode is best used when the reliability of the data
!is fundamental to
!>the stability of the application, as the database can be
!clustered for
!>failure scenarios. The performance isn't as fast as out
!of process, but the
!>tradeoff is the higher level of reliability.
!>
!>Hope it helps.
!>
!>Best regards,
!>yhhuang
!>VS.NET, Visual C++
!>Microsoft
!>
!>This posting is provided "AS IS" with no warranties, and
!confers no rights.
!>Got .Net?
http://www.gotdotnet.com
!>--------------------
!>!Content-Class: urn:content-classes:message
!>!From: "Nhi Lam" <nh****@secretplace.com>
!>!Sender: "Nhi Lam" <nh****@secretplace.com>
!>!Subject: Session State
!>!Date: Tue, 24 Jun 2003 09:56:31 -0700
!>!Lines: 17
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!>!
!>!Hi,
!>!
!>!I understand that there are 3 modes in which I can
!>!configure the SessionStateModule. What I need is an out
!of
!>!process Session State store with fail over support.
!>!The "SQL Server Mode" seems to be it, but I heard there
!is
!>!quite a bit of degradation in performance for using this
!>!mode. My next option is the "State Server Mode".
!However,
!>!this mode does not give me the fail over support. Is
!there
!>!anything that I can do the enhance the "State Server
!Mode"
!>!to provide fail over support, such as dedicating 2
!Session
!>!State servers instead of 1, and adding the hooks to
!>!replicate the session states from one server to the next?
!>!
!>!Thanks in advance for your help.
!>!--Nhi Lam
!>!
!>!
!>
!>.
!>
!
