RE: Exchange Server Redundancy

  • From: "Mulnick, Al" <Al.Mulnick@xxxxxxxxxx>
  • To: "'[ExchangeList]'" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 9 Mar 2004 11:36:04 -0500

In a roundabout way, that's what I'm trying to get to.  I realize there are
hardware solutions that do the same; they replicate writes (really they
bifurcate the write to disk) so you can have geoclustering solutions.  But
I'm trying to figure out how these bright programmers figured out a way to
protect the application data and provide a six second failover.  I'm
concerned that such a solution would be a "poor man's" cluster at best, and
a data integrity nightmare at worst.  I don't see how the fast failover
claim can work with the application nor how it is better than the MCS
solution offered by the vendor of the application (concern for the
third-party support comes into play here), but I have an open mind and if
progress has been made, I'd like to educate myself on it.
So far I don't see how the solution could be better, but I'm certainly
interested to hear.


From: paul_lemonidis@xxxxxxxxxxx [mailto:paul_lemonidis@xxxxxxxxxxx] 
Sent: Tuesday, March 09, 2004 11:21 AM
To: [ExchangeList]
Subject: [exchangelist] RE: Exchange Server Redundancy

Hi all
Sorry if I am missing something here but since when is a pure software
solution that replicates an entire drive going to offer perforamnce anywhere
near that of a cluster using shared drives. This seems nothing more than a
co-standby server solution like say Vinca? Rather than a single shared drive
it runs huge amounts of replciation between dupliacte drives on duplicate
servers. I can actually see you paying more for an inferior solution from
what I have seen so far.
Hardware clustering is far more resilient if done correctly but it does come
at a price, of course. At the end of the day you get what you pay for.
Paul Lemonidis.

----- Original Message ----- 
From: Mulnick,  <mailto:Al.Mulnick@xxxxxxxxxx> Al 
To: [ExchangeList] <mailto:exchangelist@xxxxxxxxxxxxx>  
Sent: Tuesday, March 09, 2004 3:23 PM
Subject: [exchangelist] RE: Exchange Server Redundancy <> 

I never considered MCS to be more difficult than adding a third-party app.
Is that all it does?  How does it make the recovery so fast?  How does it
check for db consistency?  


From: Tiago de Aviz [mailto:Tiago@xxxxxxxxxxxxxxx] 
Sent: Tuesday, March 09, 2004 9:17 AM
To: [ExchangeList]
Subject: [exchangelist] RE: Exchange Server Redundancy

It is much simpler because it can be implemented on a single day, it
replicates data on the bit level, it's a cheap software, and if you want,
you can user a slower machine or any other machine for redundancy.


No, while Brightstor is replicating, it doesn't know if the file is a
database or a Star Wars movie. It's all the same for him.


Tiago de Aviz


(41) 340-2363 <> 


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