RE: Dual or Quad for 4000 users

  • From: "Michael B. Smith" <michael@xxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 7 Mar 2006 12:55:25 -0500

So 4,000 * 0.6 = 2,400 IOPS.

 

That equates to a LOT of spindles.

 

Don't let ANYONE tell you that caching will help. It absolutely does not
with Exchange and mailstores of that size. You need that IOPS in raw
capacity. Blackberry definitely pushes the number slightly higher,
synchronization not so much (unless you have multiple desktops
synchronizing a single mailbox). Google desktop should be avoided by
policy.

 

Now, all that being said - 0.6 is a pretty high number for an average
user.

 

________________________________

From: Teo De Las Heras [mailto:teoheras@xxxxxxxxx] 
Sent: Tuesday, March 07, 2006 12:25 PM
To: [ExchangeList]
Subject: [exchangelist] RE: Dual or Quad for 4000 users

 

http://www.MSExchange.org/ 

The number I was given per user is .6 (It's my first week).  I put a
plan in-place to get data that will validate this (or increase it??).
With 200 MB mailboxes I think synchronization and Blackberry might push
this number higher. 

 

Teo

 

On 3/7/06, Michael B. Smith <michael@xxxxxxxxxx> wrote: 

http://www.MSExchange.org/

And what is the calculated IOPS per user?

 

Basing on what I know about other large deployments, I would guess that
you are probably OK assuming your disk subsystem can meet the IOPS load.

 

In the general case, as I'm sure you know, Exchange is I/O bound, not
processor bound.

 

Are you going to have a dedicated bridgehead server plus a couple of FE
servers? Seems like that would be a good idea too in this size of
deployment. 

 

________________________________

From: Teo De Las Heras [mailto: teoheras@xxxxxxxxx
<mailto:teoheras@xxxxxxxxx> ] 
Sent: Tuesday, March 07, 2006 10:04 AM


To: [ExchangeList]
Subject: [exchangelist] RE: Dual or Quad for 4000 users

 

http://www.MSExchange.org/ 

Thanks for all the responses!  To be more specific, we'll be placing
between 22K - 25K users on an N + 2 cluster which amounts to, at most,
4,000 users / server (6 active servers).  We've worked out the I/O
profile of the user, but I think this has more of an impact on disk
utilization than processor utilization.  As far as storage though, we'll
be using a CX700 with an appropriate number of disks. 

 

Maybe some of this information will be helpful:

- using user initiated archiving (no journaling)

- 200 MB / user (w/ quotas)

- About 25% of the clients will be OWA

- ABSOLUTELY NO BRICK LEVEL BACKUPS (Plug Ed Crowley - don't have his
website)

- Disk to disk backups which will then be written to tape

 

The consensus is that dual core AMD processors will be enough.  I'm
looking for data that will help validate this to add to our functional
design document.

 

Teo

 

On 3/6/06, Ion Gott <Ion.Gott@xxxxxxxxxx> wrote: 

http://www.MSExchange.org/

I would probably build a 3 node cluster (Active, Active, Passive) and
place two thousand users on each active dual  processor system and leave
a passive system for failover. That way all eggs wouldn't be in one
basket. 

 

The real issue is I/O and how busy and how heavily used mail is in the
environment. 

 

Are clients primarily connecting through Outlook 2003 full mapi clients
or OWA? 

 

What is the average size of the users mailboxes, will quotas be used? 

 

Is the server going to use local storage or a SAN?

 

Ion

 

________________________________

From: Evan Mann [mailto: emann@xxxxxxxxxxxxxxxxxxxxx
<mailto:emann@xxxxxxxxxxxxxxxxxxxxx> ]
Sent: Mon 3/6/2006 8:10 PM
To: [ExchangeList]
Subject: [exchangelist] RE: Dual or Quad for 4000 users

 

http://www.MSExchange.org/

I'm running about 1100-1200 mailboxes on a Dual Xeon 2.8ghz with 4 gigs
of ram . 


Until recently, I had 400 gigs worth of stores.  Right now I'm down to
about 275gigs worth.  I think this server would easily handle another
1500-2000 mailboxes based on the memory/cpu utilization I've seen.  With
3.6 or 3.8ghz processors I think 4000+ users on a dual box would be
fine.

 

It should be noted this server has nothing on it except A/V and stores .
I have a front-end server as an SMTP/POP3/IMAP/OWA gateway.

 

-----Original Message-----
From: Teo De Las Heras [mailto:teoheras@xxxxxxxxx ] 
Sent: Monday, March 06, 2006 6:32 PM
To: [ExchangeList]

Subject: [exchangelist] Dual or Quad for 4000 users

http://www.MSExchange.org/ 

I've come across the rule of thumb that there should be a processor for
every 1000 users.  I've also looked at the MMB3 stats as well.  My
question is, what's the best way to determine the number and type of
processors needed for 4000 users on Exchange 2003? 

 

Teo

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