RE: postfix clustering
> -----Original Message-----It sounds interesting, however from a system administrator point of view it
> From: owner-postfix-users@... [mailto:owner-postfix-
> users@...] On Behalf Of Stan Hoeppner
> Sent: Sunday, October 31, 2010 6:14 AM
> To: postfix-users@...
> Subject: Re: postfix clustering
> Reinaldo de Carvalho put forth on 10/30/2010 3:39 PM:
> > From Cyrus mailling list:
> > "Now that Cyrus 2.4 has been released with a lot of the groundwork
> > bandwidth efficient replication in place, Max is going to be working
> > on improving the management tools and monitoring of the replication
> > process. Our goal is to support master-master replication with safe
> > conflict resolution, and multiple replication topologies including
> > replication with more than two copies. This will allow efficient
> > failover within a single datacentre as well as geographically
> > distant close-to-real-time disaster recovery."
> Interesting. This is a _huge_ leap in capability for any IMAP server
> I'm aware of. Yet, entering either "replication" or "cluster" in the
> Cyrus home page search box returns zero results. When will these
> features be released as production ready? Right now it appears they
shouldn't be really difficult to create with the current tools. With some
custom scripts I think it should be possible to do it with current tools,
the most difficult part is messages that get deleted from the file system
(pop3/imap) I guess.
I can set it up later this year in a test environment and publish my
findings about it. If this is interesting for others to know please mention
it and I'll test it and publish it.
> > Hi Stan,I am a little surprised about your common sense for the data protection.
> >> 1. What are your specific failure concerns
> with your
> >> primary site?
> >> Network failure? Host failure? Storage
> >> failure?
> > You have a great suggestion assuming the data center
> functions well.
> > the data center primary site failure means that the
> data center
> > itself failed, meaning the host
> machine/storage/network are all in-accessible.
> You seem to be looking at this from a macro point of
> view. For an
> entire datacenter to "fail" you're looking at something
> like a natural
> disaster (hurricane, earthquake, tornado, flood, lightning)
> the facility, or all power and comm lines into it.
> The probability of
> these things is very low, assuming the datacenter was
> located, designed,
> and constructed properly.
obviously, you never heard of data center on fire that wipes out
all servers or all servers were down for 3 or more days.
Just a quick google search and there are so many data centers related
issue reported in the past.
anyway, thanks for your other suggestions.
> > Interesting. This is a _huge_ leap in capabilityit is great if you can create a blog to share.
> for any IMAP server
> > I'm aware of. Yet, entering either "replication"
> or "cluster" in the
> > Cyrus home page search box returns zero results.
> When will these
> > features be released as production ready? Right
> now it appears they
> > are
> > vaporware.
> It sounds interesting, however from a system administrator
> point of view it
> shouldn't be really difficult to create with the current
> tools. With some
> custom scripts I think it should be possible to do it with
> current tools,
> the most difficult part is messages that get deleted from
> the file system
> (pop3/imap) I guess.
> I can set it up later this year in a test environment and
> publish my
> findings about it. If this is interesting for others to
> know please mention
> it and I'll test it and publish it.