RE: BE disk config

From: Danny <nocmonkey@xxxxxxxxx>
To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
Date: Tue, 14 Sep 2004 18:26:44 -0400
Monika:

Hopefully Greg answered your question - I was away from the peecee all
day, although he answered it better than I could have. :)

I know you probably hate (just like most of us in IT :)...) the word
budget by now, but you are obviously restricted by one and may have
had to cut some corners in the project (of setting up this server),
however my main concern would be having 15000 users on one server;
single point of failure comes to mind. The classic "What if...." 's
also come to mind:

...the hard drive controller fails on the server. How long will it
take to get the part if you don't have a spare one kicking around
(sadly we all can't afford this). :)

...a power supply fails. Although, I imagine that a server in the
environment you are describing, redundant power supplies are part of
the package.

...the motherboard/mainboard or daughter board dies. How long to
repair or get a new one in?  How long can you go without email?

Maybe this is all "been there, done that" for this Exchange project,
but I just thought I would throw a few pointers out, especially when
you have 15000 users relying on one big server. I would hate to see
you in situations similar to what I noted above. Like I say, I
apologize in advance if you have covered all of this already. If not,
I would be glad to continue the discussion on or off list.

Cheers,

...D

On Tue, 14 Sep 2004 13:54:34 -0500 (CDT), Monika Rabarison
<monika.k.rabarison@xxxxxxxxxxxxxxx> wrote:
> http://www.MSExchange.org/
> 
> Great! Thanks again,
> 
> Monika
> 
> On Tue, 14 Sep 2004, Lara, Greg wrote:
> 
> > http://www.MSExchange.org/
> > 
> > I'd agree with the hot spare idea as well. To figure your quota, simply
> 
> 
> > multiply the mailbox size by the number of users. If it exceeds your
> > available disk space, lower the quota. Leave yourself a 15-20% margin of
> > error to be safe. 15000 mailboxes at 50 megabytes each equals 750 gigabytes,
> > which is more than you'll have available even if you allocate all 8 72 gig
> > drives to your RAID 5.
> >
> > It sounds like you're doing this for a school. I'd recommend a relatively
> > low mailbox size, which forces people to keep their house clean. 15000
> > mailboxes at 25 megs requires 300 gigs, which would be within your comfort
> > level.
> >
> > Greg Lara
> >
> > ----------------------------------------------------------------------------
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> > ----------------------------------------------------------------------------
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> >
> >
> > -----Original Message-----
> > From: Monika Rabarison [mailto:monika.k.rabarison@xxxxxxxxxxxxxxx]
> > Sent: Tuesday, September 14, 2004 1:10 PM
> > To: [ExchangeList]
> > Subject: [exchangelist] RE: BE disk config
> >
> > http://www.MSExchange.org/
> >
> >
> > Shawn,
> >
> > The hot spare idea is a good one.
> >
> > Thanks  a  lot,
> >
> > Monika
> >
> > On Tue, 14 Sep 2004, Shawn Moua wrote:
> >
> > > http://www.MSExchange.org/
> > >
> > > I would vote for Greg's setup as well.  However, you may want to leave a
> > > 72GB drive as a hot spare (assuming your system is capable).
> > >
> > > Thanks,
> > > Shawn.
> > >
> > > -----Original Message-----
> > > From: Lara, Greg [mailto:GLara@xxxxxxx]
> > > Sent: Tuesday, September 14, 2004 9:42 AM
> > > To: [ExchangeList]
> > > Subject: [exchangelist] RE: BE disk config
> > >
> > > http://www.MSExchange.org/
> > >
> > > This sounds like a test question. Here's how I'd do it:
> > >
> > > "C" drive = 2 x 18 mirrored
> > > "D" drive = 2 x 36 mirrored
> > > "E" drive = 8 x 72 RAID 5 (or)
> > > "E" drive = 4 x 72 RAID 5 x 2 (RAID 5+1, that is mirrored RAID 5 drives)
> > >
> > > The last option is the most secure, and costly, cutting your possible
> > > database storage in half, and is probably a little over the top for your
> > > needs.
> > >
> > > Install your system and boot files on C, Exchange logs on D, private and
> > > public databases on E. Drive lettering for D and E could be
> > > interchangeable.
> > >
> > > Greg Lara
> > >
> > > ------------------------------------------------------------------------
> > > ----
> > > ---------------------------
> > > This e-mail message may contain privileged, confidential and/or
> > > proprietary
> > > information intended only for the person(s) named. If you are not the
> > > intended recipient, please destroy this message, and any attachments,
> > > and
> > > notify the sender by return e-mail. If you are not the intended
> > > recipient(s), or the employee or agent responsible for delivering the
> > > message to the intended recipient(s), you are hereby notified that any
> > > dissemination, disclosure or copying of this communication is strictly
> > > prohibited.
> > > ------------------------------------------------------------------------
> > > ----
> > > ---------------------------
> > >
> > >
> > > -----Original Message-----
> > > From: Monika Rabarison [mailto:monika.k.rabarison@xxxxxxxxxxxxxxx]
> > > Sent: Tuesday, September 14, 2004 12:19 PM
> > > To: [ExchangeList]
> > > Subject: [exchangelist] BE disk config
> > >
> > > http://www.MSExchange.org/
> > >
> > >
> > > Hi all,
> > >
> > > I will have 15000 users and one BE server.
> > > What would be the best configuration for the
> > > (8 x 72 GB, 2 x 36 GB, 2 x 18 GB) disks on the BE?
> > >
> > > Thanks,
> > >
> > > Monika
> > >
> > >
> > >
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> > ---------------------------------------------------------------------
> > Monika Rabarison
> > Systems Administrator
> > Information Technology/HPCVI
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RE: BE disk config

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