Wouldn't the following; > DomainA To ServerA Priority 10 > DomainA To ServerB Priority 20 > DomainA To ServerC Priority 30 > DomainB To ServerA Priority 10 > DomainB To ServerB Priority 20 > DomainB To ServerC Priority 30
Only work if Server A is unavailable (not necessarily busy) then Server B would get it. I think the best situation would be a round robin in DNS. Have multiple listings for your mail server to different ip addresses. It will hit the first one, then the second, then the third and back to the first, etc... ----- Original Message ----- From: "David Maggard" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, January 28, 2004 9:40 AM Subject: Re: [IMail Forum] Load Balanced Imail Servers with Network Mailboxes > You may actually need to setup a Shared Disk Array, like fibre channel, > which would make the computer believe that it was its own personal HD, and > besides the performance is WAY better than a network share. > The only problem is concurrency, if an email comes in to the same account on > seperate servers at the same time It would be bad(possibly lost email), > UNLESS Imail performs some type of locking to avoid it. > Concurrency situation: > ServerA gets EmailA for [EMAIL PROTECTED] > ServerB gets EmailB for [EMAIL PROTECTED] > ServerA opens the mailbox for [EMAIL PROTECTED] > ServerB opens the mailbox for [EMAIL PROTECTED] > ServerA adds EmailA and closed mailbox for [EMAIL PROTECTED] > ServerA adds EmailB and closed mailbox for [EMAIL PROTECTED], but because he > opened the mailbox before EmailA was added it wont contain EmailA which is > now losted. > > The following MAY work(but I haven't really worked with imail for the past > few years, So I am rusty and it may not even be possible with Imail): > You have 6 Domains of the same size(load balanced): DomainA, DomainB, > DomainC, DomainD, DomainE, DomainF > You have 3 Servers: ServerA, ServerB, ServerC > You have the following MX Records: > DomainA To ServerA Priority 10 > DomainA To ServerB Priority 20 > DomainA To ServerC Priority 30 > DomainB To ServerA Priority 10 > DomainB To ServerB Priority 20 > DomainB To ServerC Priority 30 > DomainC To ServerA Priority 30 > DomainC To ServerB Priority 10 > DomainC To ServerC Priority 20 > DomainD To ServerA Priority 30 > DomainD To ServerB Priority 10 > DomainD To ServerC Priority 20 > DomainE To ServerA Priority 20 > DomainE To ServerB Priority 30 > DomainE To ServerC Priority 10 > DomainF To ServerA Priority 20 > DomainF To ServerB Priority 30 > DomainF To ServerC Priority 10 > You setup ServerA to be primary(actually put the mail in the mailbox) for > DomainA and DomainB, and to be backup(store and forward mail to primary) for > DomainC, DomainD, DomainE, and DomainF > You setup ServerB to be primary for DomainC and DomainD, and to be backup > for DomainA, DomainB, DomainE, and DomainF > You setup ServerC to be primary for DomainE and DomainF, and to be backup > for DomainA, DomainB, DomainC, and DomainD > > As long as only 1 server actually writes to the mailbox then concurrency is > elimanated, and with each server managing 1/3 the domains the load is > somewhat balanced, and with the servers being backups for the other domains > you get a very basic form of failover. > But with this setup if ServerA goes down DomainA and DomainB can't check > email until it is fixed, which isn't as redundant as an actual cluster, but > as far as I know you can't cluster Imail. > > > > > > ----- Original Message ----- > From: "craig loosenth" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Tuesday, January 27, 2004 7:00 PM > Subject: [IMail Forum] Load Balanced Imail Servers with Network Mailboxes > > > > Hello Everyone, > > I'm having trouble having your evaluation edition of Imail Server coexist > > with it's users' mailboxes on a network share. Basically, I would > eventually > > like to have a few Windows 2003 servers load balanced with an instance of > > Imail Server on each load balanced server with the hosts' top directory on > a > > network drive that has it's own storage array happening. > > > > The problem I'm experiencing with the only instance of the evaluation > > edition of Imail is that the test users are experiencing a "invalid > folder" > > error when logging in via web messaging. I've reviewed and tested your > > unsupported post in your knowledgebase > > (http://support.ipswitch.com/kb/IM-20031106-DM02.htm) with no success. > > > > The weird thing is that if I click on the "Directory" tab of one of my > test > > users, the imail administrator can successfully show the mailbox > > information. This would tell me that Imail is successfully reading the > > mailbox on the network share. > > > > Some other things I've tried: > > 1. check the "ignore source address..." option in the web messaging > options > > with no luck > > > > 2. ruled out any permission problem by giving all involved load balanced > > servers Administrative access to the network share. > > > > 3. When I change the top directory to C:\, all is well. > > > > 4. If I use the Imail Client Utility to log into the mailbox, I can see > the > > mailbox just fine > > > > 5. trying to log into web messaging on the actual Imail server itself via > a > > browser produces the same "invalid folder" error also. > > > > Any Clues? > > > > Sorry about the lengthy message. I'm just out of resources and wanted to > > give you as much information as possible. > > > > > > Best Regards, > > Craig Loosenth > > > > _________________________________________________________________ > > Find high-speed 'net deals - comparison-shop your local providers here. > > https://broadband.msn.com > > > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
