> -----Original Message-----
> From: Dan Shoop [mailto:email@hidden]
> Sent: Wednesday, August 09, 2006 11:57 AM
> To: Garrison, Travis J.; email@hidden
> Cc: Charles Edge
> Subject: Re: Load Balancing
>
> At 7:31 AM -0500 8/8/06, GARRISON, TRAVIS J. wrote:
> > am trying to figure out how to load balance several services across
> >2 G5 servers. Then main services are Radmind, NetBoot, and workgroup
> >management.
>
> I'm nto sure what you mean by "WorkGroup Management" here, as this is
> something usually not in need of load balancing, it being more of a
> control thing.
>
I will be implementing more than one open directory server
> > I need these services to have the ability to fail over to one of
> >the servers if the other one fails.
>
> Fail over and load balancing are very different concepts in High
> Availability Computing.
>
On our windows clusters we have load balancing across 2 nodes running
active-active. If something fails on one of the boxes, it will
automatically fail to the other box. This was something I was looking
for.
> > Would a cluster be the way to go on this and if so, do I need to
> >purchase the servers designed specifically for a cluster?
>
> There is no true clustering of OS X Servers. The "cluster" XServe is
> a bit of a misnomer, itr's just a minimal XServe, one that makes a
> good cluster, grid or pool member.
>
Yeah I am not sure what is out there, that's why I am asking and
learning. :)
> > I am finding out that when 25 desktops hit the NetBoot at one time,
> >there is always around 5 that will fail. I only use NetBoot to image
> >the computers and pull my image from apache running on the server.
>
> You may want to explore this further first as this should be workable
> w/o load balancing the netboot service(s). Have you read the docs
> that describe how to apprach this?
>
I have looked at the documentation and will be configuring two netboot
servers for the same image.
> >I will be joining our servers to our fiber-channel SAN.
>
> Then you may wish to look at XSan, which is a clustered/common
filesystem.
>
Isnt XSan Apples variant of the whole san thing? We currently own a
XioTech fiberchannel san.
> You can see a typical HA Load Balanced architectural diagram set up
> for a typical load balancing of services (in this case functioning as
> an ISP -- but the services could easily be netboot, radmind, etc and
> with a backend Fibre Channel data fabric) in our "Diagrams" section
> (see "Virtual Internet Service Provider") at http://www.iwiring.net/
>
That website does not work here. I would be interested in how this is
done. From my little research it seems that I need a frontend server
that the clients will connect to and that front end server will direct
traffic to either of two backend servers. I will probably have to have
two different san volumes that will be replicated on a schedule and on
demand for when I change an item for builds. Does this sound right?
> At 1:36 AM -0700 8/9/06, Charles Edge wrote:
> >You should be able to do this using an F5, which might be a little
> >more expensive than you were hoping.
>
> F5 is a company. They make numerous HA products. The one most
> applicable here is the BigIP. They're generally the best in class.
> CoyotePoint also makes such appliances as does RADware and a few
> others.
>
> HA planing is not something to be undertaken lightly, and I'd suggest
> you consult with someone very familiar with such implementations.
> --
>
> -dhan
>
>
------------------------------------------------------------------------
> Dan Shoop AIM:
iWiring
> Systems & Networks Architect
http://www.ustsvs.com/
> email@hidden
http://www.iwiring.net/
> 1-714-363-1174
>
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