Open Stack

if I've understood you, you are using LVM backed local storage on each
compute node.  If you run "lvs cinder-volumes"  you can see the disks. I
guess you have in your nova.conf image_type=lvm, but with the volume
group lying on the compute node disks.

One possibility to get shared storage is using one dedicated storage
node with the cinder-volume service configured and put your instance
disks in it. A more simple config is a NFS share for all your compute
nodes. To achieve this I am using a CEPH cluster.



El 11/06/15 a las 14:24, Yngvi Páll Þorfinnsson escribió:
>
> Hi,
>
> yes, the disks are local storage on each compute nodes
>
> But I did configure LVM  on each compute node, and did configure this
> according to the Juno Install guide:
>
>  
>
> „The service provisions logical volumes on this device
>
> using the /LVM /driver and provides them to instances via /iSCSI
> /transport.“
>
>  
>
> And volume groups are configured on each compute node:
>
> *vgcreate cinder-volumes /dev/sdX*
>
>  
>
> So, I guess I‘m using a shared storeage  ( iscsi ) ?
>
> Are you referring to LVM configuration and thus a shared storage,
>  iscsi ?
>
>  
>
> Best regards
>
> Yngvi
>
>  
>
>  
>
> *From:*Xabier Elkano [mailto:xelkano at hostinet.com]
> *Sent:* 11. júní 2015 12:13
> *To:* Yngvi Páll Þorfinnsson; openstack at lists.openstack.org
> *Subject:* Re: [Openstack] live migration of instances
>
>  
>
>
> Hi,
>
> do you have shared storage for your instances? If your instances disks
> are in a shared storage like iscsi or CEPH you can do live migrations
> without problems, otherwise, if your instances disks are in the
> compute nodes local storage ( /var/lib/nova/instances), you may need
> to put this directory in a NFS share to be able to do live migrations.
>
> BR,
> Xabier
>
> El 11/06/15 a las 11:56, Yngvi Páll Þorfinnsson escribió:
>
>     Hi
>
>      
>
>     I have installed and configured OpenStack(Juno) environment on
>     Ubuntu(14.04).
>
>     We have currently 1 controller node, 3 network nodes and 4 compute
>     nodes as well as 4 swift nodes.
>
>     I'm using OpenStack Networking (neutron). 
>
>      
>
>     I was thinking of doing a „live migration“ of several instances,
>     if I need to do a OS upgrade on  a compute node.
>
>     For the task of configuring „live magration“ I‘ve been reading
>     this document:
>
>      
>
>     *OpenStack Cloud Administrator Guide*
>
>     current (2015-05-21)
>
>     Copyright © 2013-2015 OpenStack Foundation Some rights reserved.
>
>      
>
>     I can quickly see it‘s necessary to add this line to the nova.conf
>     file ( on computer nodes):
>
>      
>
>     live_migration_flag=VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,
>
>     VIR_MIGRATE_LIVE, VIR_MIGRATE_TUNNELLED
>
>      
>
>     Also, it seems I need to configure a NFS mount og the dir
>
>     /var/lib/nova/instances
>
>     and thus configures file system access between all compute nodes.
>
>      
>
>     *My question is:*
>
>     Is this the only way to configure a Live migration of instances in
>     Openstack ?  i.e. configure a nfs mount of directories?
>
>      
>
>     Best regards
>
>     Yngvi
>
>      
>
>      
>
>      
>
>      
>
>      
>
>      
>
>      
>
>      
>
>      
>
>
>
>
>     _______________________________________________
>
>     Mailing list: http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>
>     Post to     : openstack at lists.openstack.org <mailto:openstack at lists.openstack.org>
>
>     Unsubscribe : http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack
>
>  
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack/attachments/20150611/5f43b3e1/attachment.html>