Re: [Fed-Talk] Sizing Mini Server for email
Re: [Fed-Talk] Sizing Mini Server for email
- Subject: Re: [Fed-Talk] Sizing Mini Server for email
- From: David Emery <email@hidden>
- Date: Fri, 18 Dec 2009 10:06:04 -0500
Clearly, a single Mini is not going to be very fault tolerant. But...
Consider the following for less than $3k:
2x mini servers
1x Drobo* or similar RAID enclosure with a bunch of disk drives in it.
Mini #1 fails. You unplug the RAID enclosure and plug it into Mini #2.
Note this is a good transition strategy, as you buy the first Mini, the
RAID enclosure, and then add the 2nd Mini if that matches your
cost/reliability figure. Or you move from the single Mini + Drobo to low
end XServe + Drobo, and that's probably $4k-$5k. If that works, you
upgrade the disk subsystem.
dave
* I'm citing Drobo as an example, frankly I'd probably go with the OWC
less expensive RAID enclosure. The advantage of the DROBO is you can put
different sized disks into it. But if I'm setting up a mail server from
scratch, I'll buy 4-5x of the same kind of drives.
And yes, a RAID enclosure is no substitute for a full data
replication/backup approach.
Nichols, Jared - 1160 - MITLL wrote:
I'm not quite sure how many 9's you really need for an email server.
To me, a lot :) Though, it’s difference of environments. If your
number 1 concern is data retention, then sure a Mini can do it.
Though, I’m not sure what kind of setup you’re going with if a drive
failure will end up with you doing a “swap-over from one machine to
another.” Can you elaborate?
j
On 12/18/09 9:38 AM, "David Emery" <email@hidden> wrote:
I'm not quite sure how many 9's you really need for an email
server. To
me the #1 concern is preventing data loss. Past that, a couple of
minutes of downtime to do a swap-over from one machine to another is
acceptable. The Mini gets us started, it's not a final solution.
dave
Nichols, Jared - 1160 - MITLL wrote:
> The thing I’d worry about with the Mini server is not computational
> load as I’m sure it could handled hundreds of email accounts without
> much of a problem – the tech specs look like it could handle it
> (though perhaps I’d like more than 4GB of RAM).
>
> What I’d /really /worry about is redundancy. There’s only 1 NIC, so
> you can’t bond them for interface redundancy and there’s only 1 power
> supply. Also, the drive setup is not ideal for reliability-required
> situations. Only two drives means that you’re doing a RAID 1 if
you’re
> looking for redundancy. And, in that case, if one drive fails, you’ve
> still got downtime because you need to crack the case open to replace
> the drive. In that case, I’d worry about computational power –
> rebuilding the RAID array while trying to keep email service up and
> speedy may be a bit taxing.
>
> What the real server-class hardware gets you (independent of Mac vs
> Windows) is hardware redundancy and the ability to hot-swap
> components. While the price of the Mini is /extremely/
attractive, for
> something as critical as email in an office where that downtime isn’t
> acceptable (if it is, by all means get one) I wouldn’t go for it.
>
> Don’t let the price blind you to the serviceability and reliability
> requirements :)
>
> j
>
> On 12/17/09 6:00 PM, "David Emery" <email@hidden> wrote:
>
> Has anyone seen any numbers/projections/rules-of-thumb for how many
> email users a Mac Mini Server whose primary duty is email server
(POP,
> IMAP, SMPT) will handle? I'm interested in computational load, not
> disk
> space... What motivated this was an exchange with a corporate IT
> person. "We're investing in Exchange upgrades." "Yeah, but I bet
> you're spending a lot more than the $1k for a Mini Server..." The
fair
> question is whether a Mini Server would handle the load.
>
> dave
>
> --
> David Emery, DSCI, supporting PdM SW Integration, PM NSI
> 703 298 3473 (office/cell), 703 272 7496 (fax)
>
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> ---
> Jared F. Nichols
> Desktop Engineer, Infrastructure and Operations
> Information Services Department
> MIT Lincoln Laboratory
> 244 Wood Street
> Lexington, Massachusetts 02420
> 781.981.5436
>
--
David Emery, DSCI, supporting PdM SW Integration, PM NSI
703 298 3473 (office/cell), 703 272 7496 (fax)
---
Jared F. Nichols
Desktop Engineer, Infrastructure and Operations
Information Services Department
MIT Lincoln Laboratory
244 Wood Street
Lexington, Massachusetts 02420
781.981.5436
--
David Emery, DSCI, supporting PdM SW Integration, PM NSI
703 298 3473 (office/cell), 703 272 7496 (fax)
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