>> -----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
OD handles this with replicas of the master.
>
>> > 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.
What services on Mac OS X Server do you want to do IP failover with?
>
>> > 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. :)
Yeah its designed as a HPC cluster node, not a failover node. And with the
new Xserver Xeon it's gone.
>
>> > 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.
Just remember that NetBoot "load balancing" is just first-responder stuff.
It makes no decisions based on load. That said if one box is really busy
then another one will probably answer first.
You can also offload the actual image to something else as well if you
want to.
>
>> >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.
Yeah, it's based on ADIC NextStore.> 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?
A hardware balancer is what you are looking for here. CoyotePoint seems to
work well with Apple's stuff.
josh
www.afp548.com
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