I am a big fan of the kernel level virtualization. The density and performance you can achieve is bar none. OpenVZ/Parallels (Linux) or Zones (Solaris) are my personal favorites. These based on the same concepts as BSD jails, for those of you who have ever worked with BSD. With this type of virtualization you only run 1 kernel for all the VM's; it is shared. You could run CentOS in something like VMWare Workstation and use the OpenVZ kernel, then create all the virtual machines you need. One kernel really leads to a large reduction in wasted resources.
OpenVZ is probably your best bet with the platform you are using: http://wiki.openvz.org/Quick_installation http://wiki.centos.org/HowTos/Virtualization/OpenVZ Resource metering in both solutions allows for defining hard and soft limits and you can overallocate resources (e.g., give every VM access to all the memory on the system). This makes 'playing around' a lot easier. You can run this with Red Hat or CentOS using the yum repositories. On the Sparc platform, with the Niagara and later CPU's, the density you can achieve is phenomenal. Imagine 200+ VM's in 2u rack space. There are trade-offs however. There are certain things you can not do in both zones and VZ containers. With OpenVZ, most of the limitations revolve around two areas: - certain kernel components (e.g., can not run a kernel based NFS server inside a zone) - network capabilities (have to use a special interface -- veth -- for raw interface access, for things like dhcpd, etc.) Axton Grams On Fri, Oct 12, 2012 at 1:50 AM, Ben Chernys < [email protected]> wrote: > ** > > I would put all of the stuff on one machine. You run the overhead of > multiple OS’s in both memory and CPU. I use 2*2 CPU and 8Gb on CentOS, > Oracle, ITEM 8.0.0 with all the do-hickeys (Email, tomcat, etc.) and still > occasionally have to reboot my Windows 7 laptop (because of other Windows > apps such as Office (big PowerPoint, Word docs, a 1.3Gb Outlook file), > Windows own VM for “XP Mode” etc. Visual Studio, etc.). Windows is not > great once memory is allocated and freed a lot. **** > > ** ** > > If I am running two VMs (not counting the Windows one which is always > running) I usually reboot before and don’t start too many native apps. I > close down the VM and copy it as I am loading it up. i.e. OS installed and > configured, Oracle installed and configured, ARS installed and configured. > I can then save all the work for the next copy. I also load two NIC > cards: one with DHCP and one fixed IP on host only so I always have > connectivity when I switch LANS. Also to remove Oracle’s complaint of > DHCP. I also make heavy use of “Snapshots”. The VMs do get large on disk: > 120Gb with a smallish number of snap-shots. The backups take time J**** > > ** ** > > I use VMware’s Workstation products and set the memory to non-swappable. > My ITSM performance is good.**** > > ** ** > > Just curious why you have 15Gb? Seems an odd amount of memory. Cards are > usually 4Gb.**** > > ** ** > > Cheers**** > > Ben**** > > ** ** > > Ben Chernys > Senior Software Architect > [image: Description: logoSthInc-sm] > > Canada / Deutschland > Mobile: +49 171 380 2329 GMT + 1 + [ DST ] > Email: Ben.Chernys_AT_softwaretoolhouse.com > Web: www.softwaretoolhouse.com > > We are a BMC Technology Alliance Partner**** > > > Check out Software Tool House's free Diary Editor and out Freebies**** > > Section for a ITSM 7.6.04 and 8.0.0 Fields spreadsheet. > > *Meta-Update**,* our premium ARS Data tool, lets you automate > your imports, migrations, *in no time at all*, without programming, > without staging forms, without merge workflow. > http://www.softwaretoolhouse.com/ **** > > ** ** > > ** ** > > *From:* Action Request System discussion list(ARSList) [mailto: > [email protected]] *On Behalf Of *Tauf Chowdhury > *Sent:* October-11-12 22:26 > *To:* [email protected] > *Subject:* Re: Best virtualization option**** > > ** ** > > ** **** > > Plan sounds good but doesn't leave much room for allocating more resources > if necessary. You should combine the ARS and Mid tier. That way you save > some overhead as well. **** > > VMware workstation is the way to go. > > Sent from my iPhone**** > > > On Oct 11, 2012, at 4:21 PM, "Jose Manuel Huerta Guillén" < > [email protected]> wrote:**** > > ** Hi listers,**** > > ** ** > > I just upgraded my computer from 3 GB to 15 GB, just to run a development > environment on my workstation.**** > > ** ** > > So currently my workstation is Windows 7 64bits i7-920 (4 cores, 8 > threads), 15 GB RAM, and tons of HDD.**** > > ** ** > > I plan to create packs of three virtual machines, one for Oracle (Cent OS, > 4 GB - 2 threads), one for ARS (Windows 2003, 64bits, 6 GB, two threads) > and one for mid tier (Windows 2003, 64 bits, 2 GB - one thread), with 3 GB > remaining for my OS. One pack of machines for each version of ARS, or > client clone. Then I will start only the one I want to work with.**** > > ** ** > > First question: What do you think of my plan?**** > > Second question: What virtualization technology are you using for these > situations?**** > > ** ** > > Thanks!**** > > **** > > Jose Manuel Huerta**** > > http://theremedyforit.com/ **** > > ** ** > > ** ** > > _attend WWRUG12 www.wwrug.com ARSlist: "Where the Answers Are"_ **** > > _attend WWRUG12 www.wwrug.com ARSlist: "Where the Answers Are"_ **** > _attend WWRUG12 www.wwrug.com ARSlist: "Where the Answers Are"_ > _______________________________________________________________________________ UNSUBSCRIBE or access ARSlist Archives at www.arslist.org attend wwrug12 www.wwrug12.com ARSList: "Where the Answers Are"
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