[Rdo-list] OpenStack GPT Disk Label for VMs (was Re: Max VM filesystem size?)

Ah, it appears that the limit is 2TB because the VMs are created with a 'msdos' partition table on the virtual disks. I think we need them to be 'gpt'.... parted shows the disks are big, just the filesystems are small: [centos@bigtest2 ~]$ sudo parted /dev/vda GNU Parted 3.1 Using /dev/vda Welcome to GNU Parted! Type 'help' to view a list of commands. (parted) p Model: Virtio Block Device (virtblk) Disk /dev/vda: 10.7TB Sector size (logical/physical): 512B/512B Partition Table: msdos Disk Flags: Number Start End Size Type File system Flags 1 1049kB 1941GB 1941GB primary xfs boot Still digging for info on how to use gpt with OpenStack/libvirt.... Nothing yet... On 11/20/2015 02:51 PM, Erich Weiler wrote: > Hi Y'all, > > I have a bunch of OpenStack Nova nodes, each with 11TB of local disk for > Cloud VMs. This is all on RDO - RHEL 7 on OpenStack Kilo. That local > storage is configured with a XFS filesystem. > > If I specify 8TB on 'root filesystem size' in a flavor, it only seems to > be able to make a 2TB root filesystem on the guest. No matter what > guest OS I use (I've tried CentOS 7.1, Ubuntu 15.10, others) it only > seems to be able to create a 2TB root filesystem. I've also tried > making a 5GB root filesystem and specifying 8TB for ephemeral disk, but > the ephemeral disk that shows up on /tmp in the guest is only 2TB as > well. > > Is there a 2TB KVM limit on VM size? Max file size in ext4 and XFS is > well beyond 2TB, so I don't think that's it... Maybe a limit in KVM or > libvirt? > > The qemu xml file on the node does specify a 8TB disk.... > > Any insight most welcome!! > > cheers, > erich