Nate, That pdf resolved a bunch of questions I had.. Thanks, now I have a focus and some new toys to play with. I am going to configure a VM and have a snapshot of the Native QMT-PLUS server and let the VM do all of the backups to the NAS. If all goes well the goal will be to have a 2 machines and both set up to do VM doing replication for the mail services. --Dave nate wrote: > David Milholen wrote: > >> I have managed these for so long on just a couple of machines but >> technology is changing and we are growing as a company and I have heard >> and read great things that can be done with VM. >> > > Really depends on how much usage the systems get, if you are migrating > from physical systems to virtual systems look at the CPU, load, and > i/o(if linux use iostat). I run vmware server on a 5-year old system > which has 2 VMs on it, runs apache, mysql, mail services, dns, and > a bunch of other small things. Works fine, though my typical CPU > usage on the *host* is 5%. Running off a pair of 250GB SATA drives > connected to a 3Ware 8006-2 RAID card. Dual Xeon 3Ghz, 6GB ram, 32-bit. > > In my experience most systems like the ones your using hosting > the apps you mention are idle 99%+ of the time, making them perfect > VM candidates. > > >> I have another ibm Eserver with a couple of scsi 15k 50GB drives and 4 >> GB of memory that I can configure from scratch to do VM or what ever I need. >> I guess I should start by asking how VM is configured and How does >> allocate resources on the server? >> > > Resource allocation depends on the VM technology your using, myself > I am a long time VMware fan/user, so I stick to their stuff, but > no matter what it really depends on how much load your system will > be under. > > >From a VMware perspective, this PDF is informative, but probably > well beyond the scale your operating at, you can get an idea as > to the complexity that "virtualization" entails. > > http://portal.aphroland.org/~aphro/vmware/09Q3-perf_overview_and_tier1-pac_nw.pdf > > Performance of bare metal hypervisors like VMware ESX will > dramatically outperform the hypervisors that run on top of > another OS(I think they call them "type 2") like VMware server. > But bare metal hypervisors have very strict hardware requirements. > I use VMware server on my own system since the hardware is not > supported by ESX. > > At my full time job I run dozens of ESX systems on real hardware, > with a proper SAN and networking infrastructure. > > nate > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20100303/82d488a4/attachment-0005.html>