2nd Hard Disc & LVM2 Questions

[kingnubian]

I use Proxmox in a home based setup for production & testing & am loving it.
My setup includes 2 1Tb hard drives. Using part of the guide located here,

http://pve.proxmox.com/wiki/Storage_Model#LVM_Groups
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" Use local devices (like /dev/sd../, FC) Before you can use local devices for storing VM´s you need to configure LVM2 for these devices on the console first.
This is a three step procedure (I just plugged in a 8 GB USB Stick for demonstration, recognized as /dev/sdl on my box)
First create the physical volume:
proxmox-ve:~# pvcreate /dev/sdl1
Physical volume "/dev/sdl1" successfully created
proxmox-ve:~# Second, create the volume group:
proxmox-ve:~# vgcreate usb-stick /dev/sdl1
Volume group "usb-stick" successfully created
proxmox-ve:~# And finally: Add the LVM Group to the storage list via the web interface."
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I added the second drive (sdb1) to an lvm group.

If I wanted to create a vm, for example for a file server, that would be allocated 1.5tb of the total available drive space would Proxmox's LVM implementation automatically "spill over " the storage requirements meaning would it spread it between discs without my intervention?

This is defined, for example, during the Xenserver install as you are asked both what drive in a multi drive setup do you wish to install the hypervisor os on & then if you wish to use all or 1 drive for everything else. Spanning between drives is then seamless.

If I am wrong in how I have done the setup can I get some guidance in getting it the way I am after?

 

[dietmar]

If I wanted to create a vm, for example for a file server, that would be allocated 1.5tb of the total available drive space would Proxmox's LVM implementation automatically "spill over " the storage requirements meaning would it spread it between discs without my intervention?

LVM simply use the available PVs. Although I would never add different types of storage to one VG (and never add a removabel USB stick).

 

[kingnubian]

LVM simply use the available PVs. Although I would never add different types of storage to one VG (and never add a removabel USB stick).

The storage available in my setup are two identical hard drives. Let me put it this way since I was not very clear in my initial post.

1)I have 2 1Tb hard drives in my server. Proxmox, through it's cd installation, allows 1 only hard drive to be the installation drive and therefore active post installation for it's needs. The other Hard drive for the time being isn't used by Proxmox.

2) I follow the instructions in the link I posted above to add the other local 1TB hard drive to an LVM group.

3) I create a VM for a file server and through the web based server manager allocate 1.5Tb of hard drive space to this vm in question.

4) I start transferring files to this newly created File Server VM which exceed the physical capacity of a single Hard Drive (>1Tb) but still falls within the 1.5Tb of hard drive space allocated to the vm.

5) Will Proxmox 1.4 use the 1.5Tb allocated hard drive space as a single volume spanning it across the two physical hard drives without user intervention or errors even though in reality this space requires storage on both physical hard drives?

 

[dietmar]

5) Will Proxmox 1.4 use the 1.5Tb allocated hard drive space as a single volume spanning it across the two physical hard drives without user intervention or errors even though in reality this space requires storage on both physical hard drives?

yes.