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Re: Parallels Server supports OSX Server as Guest OS


On May 9, 2008, at 12:45 PM, Josh Wisenbaker wrote:

On May 9, 2008, at 9:55 AM, Andrew MacKenzie wrote:

http://www.parallels.com/en/products/server/mac/

What would be a real world use for having this?
Just curious.

If you have multiple physical servers that are lightly loaded, you can run
them all on the same hardware. For example, many Active Directory shops run
their Directory Controllers virtualized, because those don't really do a lot
that needs wicked-fast hardware for their own exclusive use.


This is the exact example I heard at a server seminar this week - host an Open Directory Replica in a VM on the same hardware as your Open Directory Master.  I would probably host it on another machine, but still, it got me thinking.

I think that's a pretty bad idea. If the host OS goes down then so does all the guests. Not to mention the latency requirements of OD servers. Really you would want your replica on a separate switch or network.

I could see using the VMs for something such as DHCP, ntp, and other network services.  DNS might have a latency issue, but not sure.  If your host server craps out on you, take the VM with DHCP and other services to another box, fire it up, and fix the broken box.  I could also see this being a great way to get better usage of existing hardware.  The three towers running FileMaker, our Library system and other system could be freedup.  Those are not high usage systems, and now I have three free boxes to re-use.

One of those could be a mirror of the VM Host Server, so if the primary crashes I can just move over the VMs.  That is the situation where I see these being very useful; in addition to snapshots.


----
Randall R. Saeks, ACSA
Network & Server Administrator
Northbrook / Glenview School District 30




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References: 
 >Re: Parallels Server supports OSX Server as Guest OS (From: "John C. Welch" <email@hidden>)
 >Re: Parallels Server supports OSX Server as Guest OS (From: Andrew MacKenzie <email@hidden>)
 >Re: Parallels Server supports OSX Server as Guest OS (From: Josh Wisenbaker <email@hidden>)



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