Cloudstack 4.20.0.0, KVM with CEPH RBD live migration error

[sourceYan]

Hi cloudstack Community,

we do some tests with cloudstack and ceph.
Create the primary ceph storage is no problem, offline migration works also good!
But if i want do move a VM from or to ceph, i got the following error:

Failed to migrate VM [VM instance {"id":10,"instanceName":"i-2-10-VM","type":"User","uuid":"ff8ae527-bd26-4b74-b02c-8de21159ff01"}] along with its volumes due to [com.cloud.utils.exception.CloudRuntimeException: Copy volume(s) to storage(s) [{volume: "17", from: "7", to:"9"}] and VM to host [{vm: "10", from: "1", to:"4"}] failed in StorageSystemDataMotionStrategy.copyAsync. Error message: [Exception during migrate: org.libvirt.LibvirtException: Storage pool not found: no storage pool with matching target path '/var/log/cloudstack/management/cloudstack'].].

any ideas?

best regards!
YAN

[DaanHoogland]

@sourceYan , migrations across different storage solutions don’t always work great. It might well be that yours isn’ t supported.
What is the target storage for type (i.e. NFS)?
Did you try the reverse, to your ceph cluster?

[sourceYan]

hi @DaanHoogland - thank you for your message!
i tested both, and reverse NFS Storage an "local" Mountpoint (OCFS2, iSCSI)... but all fail.
Only offline it's possible. Between OCFS and NFS it works without issues.

[weizhouapache]

this is a known limitation I think

for vm live mirgation between ceph storages, we should migrate the volume instead of the vm (it will use "virsh blockcopy").
but it may not with either.

[sourceYan]

hi @weizhouapache - thanks for your message!
if i try to migrate only the storage, a message appear, that with kvm i have to move also the host.
i didn't tested the migration between two ceph storages yet...