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I installed proxmox on a single 250GB hard drive and I would like to add a second identical hard drive to put more VM's on. I already tried once, and didn't get very far. I added it and formatted it as an ext4, but when I went to use the disk, it said only 8GB was available. That's not quite right. So I did some searching and found that I had to make the device ID 8e for a linux lvm. After I did this, it said I had to restart, so I did... and it wouldn't boot!!!

What did I do wrong? And how do I do it right? (I know I could throw in a RAID card and do a RAID 0, but I'd rather not).

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You can either use your new disk to create new storage resources:

  • New directory (tree) to store files
    • partition and format your device using your filesystem of choice (ext3/4 and XFS are the most commonly used)
    • mount the FS to, say, /srv (do it manualy with mount command and add it to fstab)
    • create the needed directories with mkdir /srv/{isos,images,templates,backups,containers}
    • create the Proxmox storage resources of type directory in the web UI.
  • LVM volume group to store VMs disks "images" as logical volumes:
    • partition your device and set the LVM (8e) flag
    • create a new physical volume with pvcreate /dev/<DEVNAME>
    • create a new volume group with vgcreate <VGNAME> /dev/<DEVNAME>
    • create the Proxmox storage resource of type LVM group in the web UI

Or you can use it to increase size of the default one:

  • LVM physical volume to extend the default pve-data LVM logical volume and /var/lib/vz filesystem:
    • partition your device and set the LVM (8e) flag
    • create a new physical volume with pvcreate /dev/<DEVNAME>
    • extend default VG with vgextend pve /dev/<DEVNAME>
    • extend data logical volume with lvextend /dev/mapper/pve-data /dev/<DEVNAME>
    • verify your FS is clean with fsck -nv /dev/mapper/pve-data
    • resize your FS with resize2fs -F /dev/mapper/pve-data

Checkout http://pve.proxmox.com/wiki/Storage_Model

  • Is it better to extend pve-data or make a new group? I don't understand the ramifications of either. – AllanT Jan 23 '16 at 3:26
  • Oh my goodness thank you for this clear answer. All the wiki they have kinda sucks as far as CLI or even GUI instructions. – Tmanok Mar 27 at 4:29
  • Hang on though, now at a terminal, "Bad magic number in super-block while trying to open /dev/mapper/pve-data hmmmmm – Tmanok Mar 27 at 4:37
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Finally found the page that talks about it:

http://pve.proxmox.com/wiki/Storage_Model

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https://pve.proxmox.com/wiki/Extending_Local_Container_Storage

Use "GNU parted" for partitions > 2TB and partition type "ee" (GPT)

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