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Hi!
I believe you are just "getting started" with LVS, I suggest that:
1. Take three or four servers (doesn't have to be *real* servers), and
try a basic implementation, and see how you feel with it. This, off
course, based on your current configuration (an scaled-down version of
your current setup).
2. Make accordingly scaled tests.
3. Tell us how it went! or, ask any questions you may have on your way.
LVS will "do the job" you need (balance among a cluster of servers),
so: yes, you can do the load balancing with LVS.
Now, one question: What is the speed of your SAN storage? (SAN to
Server), it *have to* be at least 5Gbps (I have seen sites with just
2Gbps connections to their storage).
Other question: how is your current server load? how are you
connecting these 5Gbps? (a 10Gbps ethernet card? or a bond of several
1Gbps cards?). Sometimes a server tune-up can allow you for twice the
current performance.
Other thing: if you are currently using postfix + dovecot + some kind
of authentication there, you should stay with it, specially
considering you have ~20k domains (I would not like to migrate all of
these, unless being paid by-the-hour), you should only make sure the
whole system is scaled, or at least, well benchmarked to know that you
won't have another bottleneck on the auth side.
I hope this helps,
Ildefonso.
On Thu, Aug 12, 2010 at 5:36 AM, Faisal Ghulam <f.ghulam@xxxxxxxxxx> wrote:
> Just share yours experience about deployment of LVS with SMTP,IMAP/POP3.
> if we used only 500 Mb/s traffic to one LVS then what we will have to do for
> achieve it behind Postfix as SMTP and
> Dovecot as IMAP/POP3.
>
>
>
>
> On Thu, Aug 12, 2010 at 1:31 PM, Timo Schoeler
> <timo.schoeler@xxxxxxxxxxxxx>wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
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>> thus David Lang spake:
>> > I missed the beginning of this thread
>> > On Thu, 12 Aug 2010, Timo Schoeler wrote:
>> >
>> >> -----BEGIN PGP SIGNED MESSAGE-----
>> >> Hash: SHA1
>> >>
>> >> thus Jose Ildefonso Camargo Tolosa spake:
>> >>> Hi!
>> >>>
>> >>> On Wed, Aug 11, 2010 at 3:56 AM, Faisal Ghulam <f.ghulam@xxxxxxxxxx>
>> wrote:
>> >>>> I want to deploy LVS for highly traffic IMAP,POP3 .
>> >>>>
>> >>>> Can any one guide me how to get it with Centos 5.3.
>> >>>>
>> >>>> My backend Email server is Postfix.
>> >>> Postfix handles SMTP, not IMAP/POP3. I use dovecot for IMAP/POP3, but
>> >>> I'm more interested on security than performance, so..... maybe
>> >>> someone else can suggest a faster IMAP server (although dovecot is not
>> >>> slow, I think, just for the record).
>> >> Dovecot is one of the best performing (if not *the* best performing)
>> >> pop/imap servers out there. Just use the search egine you like for
>> >> benchmark comparisons, and you'll get a bunch of results that will show
>> >> this, on different OSes (may it be GNU/Linux, xBSD, or whatever).
>> >
>> > take a look at Cyrus, it is _very_ scalable, and includes replication and
>> > clustering capabilities. It's routinely used by universities and other
>> larger
>> > organizations.
>>
>> Cyrus is a nice player in the field (still run it myself on some hosts),
>> but it has some major drawbacks:
>>
>> - - proprietary mail storage mechanism (compared to MailDir/mbox et al.)
>>
>> - - slower than Dovecot, e.g.
>>
>> - - compared to other pop/imap servers, it does not implement RFCs as good
>> as others (Dovecot is very good here, too)
>>
>> > David Lang
>>
>> HTH,
>>
>> Timo
>>
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>> _______________________________________________
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>> http://www.linuxvirtualserver.org/
>>
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> _______________________________________________
> Please read the documentation before posting - it's available at:
> http://www.linuxvirtualserver.org/
>
> LinuxVirtualServer.org mailing list - lvs-users@xxxxxxxxxxxxxxxxxxxxxx
> Send requests to lvs-users-request@xxxxxxxxxxxxxxxxxxxxxx
> or go to http://lists.graemef.net/mailman/listinfo/lvs-users
>
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