[linux-lvm] creating pv's on LVM's for virtual guests

[Brem Belguebli]

On Mon, 2011-05-09 at 15:40 -0600, allan wrote:
> Hi Steve,
> 
> I've had mixed results doing that very thing. Two servers perform very differently.
> One mach, an HP DL380G6 w/ dual quad core Zeon and 6 146G disks installed with CentOS 5.5 stock xen, lvm, etc. performs 
> very well. 
It may be more related to the write cache ratio of your smartarray on
the DL38O, no ?
> Another machine intended as a low class server, a desktop quad core AMD, 4 SATA disks installed with stock 
> CentOS 5.5 same as first mach, has issues with disk perfomance on every DomU - writes are 1/10 the rate of Dom0 -- I'm 
> still troubleshooting it.
> I see no problem with using LVM on Dom0, carving it up and offering to DomU virtuals and the virtuals using LVM for 
> storage. One thing to avoid: do not duplicate an LVM names within the entire machine. i.e. installer, when told to use 
> LVM, will create a vg of a specific name. If this name is not overridden, and you create multiple DomUs with same 
> process the VG name will be duplicated (as well as the LV names). Avoid name duplication.
> I hope this helps.
All the VM's I've been using (ESX, KVM, Xen, and also HyperV) are built
on LVM and no particular issue nor performance problem 
> 
> Allan
> 
> Steve Shorter wrote:
> > Howdy!
> > 
> > 	I am setting up virtual guests to have a LVM created
> > from the host. It would be good to use LVM's in the
> > guest also.. for easy volume expansion etc...
> > 
> > ie. I am creating pv's/vg's/lvms on top of LVM's. It *seems* to
> > work but some of the userland tools need the option -ff
> > 
> > 	Does anybody see any issues doing this?
> > 
> > 	thanx - steve
> > 
> > _______________________________________________
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> > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
> > 
> > 
> 
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