Hi there,
This question is not related to Imail but I'd like to thank you first. I am using
WLBS for IIS 4.0 now and just wondering is there a tool outthere to do content
replication between IIS servers, including the IIS Metabase.
thanks,
Dan
---------- Original Message ----------------------------------
From: "Sanford Whiteman" <[EMAIL PROTECTED]>
Date: Tue, 2 May 2000 23:25:53 -0400
>You did not read my post -- perhaps you skimmed it. There is no "true" load
>balancing -- this is a figment of your imagination. Load balancing -- which is a
>concept only, not a trademark! -- is based on (a) distribution or replication of
>content and (b) content-sensitive or utilization-sensitive redirection. I have used
>several market-leading hardware and software load balancers, and there are none that
>truly "poke" POP3 performance at the application layer (they will poke for HTTP, FTP,
>et al. responsiveness) as part of their LB algorithm. You would thus be reduced to
>"best-guess" based on server utilization or basic round-robining. Thus, the
>environment I described is the best way to use commercial LB front ends against an
>Imail server farm. Yes, you *can* have just one exposed IP address -- this is the
>default behavior with HydraWEB, Radware, etc.
>
>In addition, you are dead wrong about WLBS' resource footprint. It is not
>resource-intensive and performs extremely well at load-balancing replicated content.
>
>S.
>
>P.S. If you don't like my answer, give a better one. Your attack was OT, as my
>response was to Dean Zerbe's query and was fully appropriate to the question.
> -----Original Message-----
> From: Dave Koontz <[EMAIL PROTECTED]>
> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
> Date: Tuesday, May 02, 2000 8:42 PM
> Subject: Re: [IMail Forum] IMAIL 6.03 How do I Config to load balance behind a
>Cisco 6509
>
>
> I am sorry, but this does not sound at all like "Load Balancing". Why should you
>have to "Segment" your user base? In a true Load Balancing server scheme, multiple
>servers would answer to the same IP Address - based on server load, and all would use
>the same exact user base on an external device available to each server. It should
>be a 100% "automated" system - NOT partially manual. All currently available servers
>play....equally! Not just the which outgoing SMTP servers are active game, which
>does nothing for POP, HTTP, IMAP or other "user" access.
>
> If you are counting on WLBS, you need to do some serious research --- it is a
>clustering solution at best, with tremendous overhead. TRUE load balancing can be
>handled easily at the router level or with software such as Resonate's Central
>Command.
> ----- Original Message -----
> From: Sanford Whiteman
> To: [EMAIL PROTECTED]
> Sent: Tuesday, May 02, 2000 6:45 PM
> Subject: Re: [IMail Forum] IMAIL 6.03 How do I Config to load balance behind
>a Cisco 6509
>
>
> Local SMTP/POP3-wise, the Imail "Peer Server" function will help you
>accomplish this. You set your Imail servers up to "overflow" to each other, after
>segmenting your user base across the servers (you can use a round-robin algorithm
>when creating the SQL statement that creates accounts). You can even share the same
>SQL database if you want -- just use different tables. This way, if a load-balanced
>request comes in for a given POP3 account that isn't actually hosted on the
>destination server, it will search the cluster and redirect the traffic. Note that
>the TCP/IP traffic is still routed through the destination server (it doesn't
>actually get redirected, HTTP-style), but you save disk I/O and actual SMTP
>processing.
>
> Remote SMTP-wise, you don't really need to do anything except point clients
>to the cluster address. You may want to give each box the same primary hostname to
>avoid Reverse DNS issues.
>
> Overall, it's partially manual and partially automated, but it works.
>
> Sandy
> -----Original Message-----
> From: Zerbe, Dean <[EMAIL PROTECTED]>
> To: '[EMAIL PROTECTED]' <[EMAIL PROTECTED]>
> Date: Tuesday, May 02, 2000 6:14 PM
> Subject: [IMail Forum] IMAIL 6.03 How do I Config to load balance behind
>a Cisco 6509
>
>
> My company is running a Cisco powered network. with 2 Cisco GSR's those
>are connected to 2 6509 switches. the Cisco 6509 has the ability to do load balance.
> the hardware I am using allows 2 Ethernet ports to be connected for each server to
>theoretically do 200mbps full duplex. this network is fully fault tolerant
>
> Now the Question....
>
> How should I configure IMAIL or should I bother?
>
>
> My possible concept.
>
>
> run 4 or more front end IMAIL servers load balanced from the Cisco 6509.
>have those servers sync users by using a SQL 7.0 database. have the directory
>structure point to a UNC \\bigdiskserver\domainxyz.
>
>
> then presto it all crashes because of open file issues? I don't know any
>ideas would help? even other products you tell me
>
> the SQL server and location for the file are in a Microsoft cluster
>server.
>
> this is expected to hold 500,000 + accounts.
>
>
>Please visit http://www.ipswitch.com/support/mailing-lists.html
>to be removed from this list.
>
--
-------------------------
Dan Nguyen
-------------------------
--
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