LVM for VMs on PVE Volume Group

Brients1979

New Member
Aug 22, 2015
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In the past, I've configured my servers with a smaller capacity Raid 1 for the Proxmox installation and used a separate larger Raid 10 array for the VMs on a LVM volume. For this build I have just one large Raid 10 and I use a tiny percentage of the array for the swap, root, and data partitions. Using the GUI, I added a LVM volume to the existing PVE group for VM storage.

Is this the appropriate way to make use of the additional disk space that was available on the array at install or should this exist on a separate volume group on a separate physical volume? I guess my question is, after the proxmox installation has finished, what's the optimum way set up the rest of the available disk space for local VM storage? It's a 3.64 TB array and only about 120GB is being used by the proxmox installation. I'd like to use the rest as a LVM volume for KVM storage.
 
Hi,

Normally, it's totally fine. The IO requirements for Proxmox are not that high (only some logging and RRD stuff) such that you can always have it on your disks. I would never use separate disks (2+4 setup), I would recommend to use all at once (6 setup) to get most performance out of it. The problem nowadays is that the disks are sooo big. This is good for backup, yet terrible for performance. Try to get as many fast devices as possible in your machine to get decent performance when running a lot of machines. IO performance can only be beaten by more disks (or more SSDs).

You can also evaluate if you want to use RAID 5 or RAID 10 - the first is best for read intensive tasks like data warehouse and the later one for OLTP stuff.
 

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