I just setup a CentOS 6 box (at home) to run as a KVM host. It’s replacing an absolutely ancient CentOS 5 server that’s running Xen. I have one OS drive, and two drives in RAID 1 with LVM on top which is being used as the KVM storage pool.
I created a KVM that will run OpenMediaVault (OMV). OMV requires an OS drive (which is really a LVM), and a separate drive(s) to put all the media on. This is where I’m a little unsure on how to proceed. I think I have two options:
1. Let the KVM host manage the drives (i.e. RAID with LVM on top) and just assign the single volume to OMV. OMV will see it as one HD.
2. Assign the individual drives to the OMV KVM, and let OMV manage the RAID creation, management, etc.
I’m not sure which one will perform better. My hunch is if the RAID management is left at the host level, I’ll see better overall performance. Performance isn’t exactly my number one goal here, but I don’t want to kill it completely either by going the wrong way.
On the other hand, if I let OMV do the RAID management for the media storage disks, I’ll gain future flexibility because it’ll be much easier to move OMV to bare metal.
Which way should I go? What would you guys do?