[Xen-users] XCP and Openfiler as the storage

[Eduardo Bragatto <eduardo@xxxxxxxxxxxx>]

Hi,

I have been using Xen under CentOS and Openfiler as the storage for a  
while now, however with the release of RHEL6 without support for Xen  
and with the release of XCP 1.0, I have the impression it's time to  
move away from CentOS and give XCP a try.
My greatest doubt is about LVM. Openfiler handles an entire RAID10  
volume which is exported as smaller volumes created through LVM via  
iSCSI. However, XCP also uses LVM to manage snapshots and such.
I believe if I start using XCP with my current storage server  
(Openfiler), I will end up with two layers of LVM -- first a volume on  
Openfiler which is exported via iSCSI, and then a new LVM layer  
created on top of the LUN I will import via iSCSI on XCP.
How bad (performance-wise) would be to have two layers of LVM? Would  
it be too complicated to maintain? (I imagine it would be as simple as  
dealing with the same thing twice, but there's also XCP handling LVM,  
so I'm not sure how that would work out).
Does anyone here has similar experiences they can share?

I know Openfiler does not have an API for integration with other  
appliances, so I believe XCP would not be able to create and  
manipulate the LVM directly on the Openfiler storage in order to avoid  
the two layers on top of each other. Does anyone if that kind of  
integration is doable, or even possible?
Best regards,
Eduardo Bragatto

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