On Mon, Nov 26, 2012 at 6:51 AM, Lei Zhang <zhang.lei....@gmail.com> wrote: > I creat a lvm named vol-0 and attach it to the machine com-0. After a period > of time, the vol-0 is full and I want to extend it. At now, I have two > solutions.
Nested LVM gets tricky so I want to be sure I am clear on your setup: * Your host has a logical volume (LV) 'vol-0' that is attached to a VM named 'com-0'. * com-0 uses the attached logical volume (vol-0 on the host) as a physical volume (PV) for its own LVM configuration. > Because the vol-0 is manage by the LVM on the hoster. So I can extend the > size of it by using lvextend. But I meet that the vm(com-0) can not be aware > this. Should I make some extrac operations like reseize2fs? I have no ideas. If vol-0 is used directly as a block device with a filesystem on it (older Xen installs often did this) then a resize2fs is sufficient to recognize the additional space. It appears this is _not_ your configuration, correct? If vol-0 is used as a PV in com-0 then you can run pvresize inside com-0 and have com-0's LVM recognize the additional space. > In the vm (com-0), I can treat the vol-0 as a normal block device and create > lvm on it. When need more space, the hoster can "plug" a new lvm > device(vol-1) on it. In the vm, I can add it to the lvm. But I found another Correct, this is another way to increase the space available to cpm-0's volume groups. > problem. Because the vol-* is not real block device, when I create lvm on > it, the hoster is aware of it. The result is that on the hoster, another PV > is created base on a lvm partition like bellow. I want to know, it is > acceptable? To fix this you need to adjust the filter on your host's /etc/lvm/lvm.conf. You can either reject any physical volumes found for VMs: filter = ["r|/dev/cinder-volumes/.*", "a/.*/"] # reject cinder devices, alow everything else or you can only look at particular divice files for physical devices: filter = ["a/dev/sd.*"] # look only at SCSI disks for physical devices That last one will likely need adjusting for your local block device names. dt -- Dean Troyer dtro...@gmail.com _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp