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From Yiping Zhang <>
Subject Re: Cloudstack - volume migration between clusters (primary storage)
Date Tue, 30 Aug 2016 17:00:18 GMT
I think the work is mostly performed by the hypervisors. I had seen following during storage
live migration in XenCenter:

Highlight the primary storage for the departing cluster, then select the “Storage” tab
on the right side panel.  You should see disk volumes on that primary storage. The far right
column is the “Virtual Machine” the disk belongs to.

While the live storage migration is running, the migrating volume is shown as attached to
a VM with the name “control domain for host xxx”, instead of the VM name it actually belongs

To me, this is pretty convincing that Xen cluster is doing the migration.


On 8/27/16, 5:10 AM, "Makrand" <> wrote:

    Hello ilya,
    If I am not mistaken, while adding secondary storage NFS server ip and path
    is all one specifies in cloud-stack. Running df -h on ACS management server
    shows you secondary storage mounted there. Don't think hypervisor sees NFS
    (even if primary storage and NFS coming from same storage box). Plus, while
    doing activities like VM deploy and snapshot things always move from
    secondary to primary via SSVM.
    Have you actually seen any setup where you have verified this?
    @ cs user,
    When you're moving the volumes, are those attached to running VM? or those
    are just standalone orphan volumes?
    On Thu, Aug 25, 2016 at 4:24 AM, ilya <> wrote:
    > Not certain how Xen Storage Migration is implemented in 4.5.2
    > I'd suspect legacy mode would be
    > 1) copy disks from primary store to secondary NFS
    > 2) copy disks from secondary NFS to new primary store
    > it might be slow... but if you have enough space - it should work...
    > My understanding is that NFS is mounted directly on hypervisors. I'd ask
    > someone else to confirm though...
    > On 8/24/16 7:20 AM, cs user wrote:
    > > Hi All,
    > >
    > > Xenserver 6.5, cloudstack 4.5.2. NFS primary storage volumes
    > >
    > > Lets say I have 1 pod, with 2 clusters, each cluster has its own primary
    > > storage.
    > >
    > > If I migrate a volume from one primary storage to the other one, using
    > > cloudstack, what aspect of the environment is responsible for this copy?
    > >
    > > I'm trying to identify bottlenecks but I can't see what is responsible
    > for
    > > this copying. Is it is the xen hosts themselves or the secondary storage
    > vm?
    > >
    > > Thanks!
    > >

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