Sorry, I forgot to include the list in the to...
Any comments would be greatly appreciated, esp. in regard to nfs locking...
Jeff,
You make a very valid point, however this can be overcome in many ways.
I am currently researching this for my employer. Here's a general
overview of how I'm planning on designing our network/servers.
--------------------------- <- external net
| |
director1 director2
| |
--------------------------- <- internal net
| | |
qmail1 qmail2 qmail3
| | |
\_______ | ______/
\|/
|
--------------------------- <- gigabit 'nfs' net with backup 100Mb net
| |
NFS1 NFS2
I'm looking at using LVS (Linux Virtual Server) to handle the load
balancing/clustering. We'll be using the cluster for www/pop3/dns/etc
as well. LVS will allow us to add machines dynamically.
We'll be using qmail/ldap/ldap-control and 2 (or more) LDAP servers for
qmail configuration. I've also considered having the cluster servers
boot off of CD and use a single disk for /tmp and the queue.
I haven't fully researched the NFS servers yet, but here is my idea.
The developer that made ReiserFS also wrote/is writing DRBD, which is
capable of doing network mirroring. I am planning to use 2 e450s that I
have with Samba (for WinXXXX servers), NFS (mirrored with DRBD), and
heartbeat software to control the failover between the 2 servers.
There are 2 obvious alternatives to the NFS solution that I mentioned
though. NetAPP makes an appliance (Filer) that can handle >6TB (RAID5)
storage which provides for (according to some friends of mine that use
them in a 75+ e6000/45+ win2k env) 5 9s of reliability. I don't have
prices, but I've heard that one Filer can run >$80k. The other option
is a software solution (clustering/replication/failover) from Veritas,
which comes highly recommended.
DISCLAIMER: I don't work for any of the above mentioned companies.
Would anyone be interested in helping me develop a FAQ for this?
Cheers,
Mike
Jeff Palmer wrote:
> And if your NFS server goes down, both servers are useless. In which
> case, what was the point of having a backup server again?
>
> Jeff Palmer
> [EMAIL PROTECTED]
>
> At 09:57 AM 6/13/01 +0300, you wrote:
>
>> Alternatively you can run two SMTP servers and one POP server. Do
NAT for
>> the two and export the partition with Maildirs(at the pop server) to the
>> SMTP servers through NFS. The two servers seem to be one to the outside
>> world. NFS can be insecure though.
>>
>> Joe.
>> ----- Original Message -----
>> From: "Henning Brauer" <[EMAIL PROTECTED]>
>> To: <[EMAIL PROTECTED]>
>> Sent: Saturday, June 09, 2001 4:15 AM
>> Subject: Re: backup mail server help
>>
>>
>> > On Fri, Jun 08, 2001 at 04:33:49PM -0700, Hank Wethington wrote:
>> > > What I'd like to accomplish is if Server A is unavailable, then mail
>> goes to
>> > > server B. Once A is back up, server B sends the mail back to
>> server A.
>> Does
>> >
>> > On server B, add all domains in question to rcpthosts, but NOT to
>> local
>> or
>> virtualdomains. That's it ;-))
>> >
>> > --
>> > * Henning Brauer, [EMAIL PROTECTED], http://www.bsws.de *
>> > * Roedingsmarkt 14, 20459 Hamburg, Germany *
>> > Unix is very simple, but it takes a genius to understand the
>> simplicity.
>> > (Dennis Ritchie)
>> >
