Thanks a lot for your response, Hrushikesh. It is really helpful :)
Regards,
Narendra
From: Gangur, Hrushikesh (R & D HP Cloud) [mailto:hrushikesh.gan...@hp.com]
Sent: Tuesday, November 12, 2013 11:39 AM
To: Trivedi, Narendra; openstack@lists.openstack.org
Subject: RE: Cinde muti-backend feature
Answers in line.
From: Trivedi, Narendra [mailto:narendra.triv...@savvis.com]
Sent: Tuesday, November 12, 2013 9:24 AM
To: openstack@lists.openstack.org<mailto:openstack@lists.openstack.org>
Subject: [Openstack] Cinde muti-backend feature
Hi All,
Could someone please explain the Cinder multi-backends feature (as of Havana)?
Specifically, I had the following questions:
1) Can I attach multiple physical storage backends (let's say one all SSD,
another all SATA for instance) to a single host?
Yes. A typical cinder.conf would look like:
enabled_backends=lvmdriver-3par,lvmdriver-netapp
auth_strategy = keystone
scheduler_driver=cinder.scheduler.filter_scheduler.FilterScheduler
[lvmdriver-3par]
volume_group=cinder-volumes-3par
volume_driver=cinder.volume.drivers.lvm.LVMISCSIDriver
volume_backend_name=LVM_3par
[lvmdriver-netapp]
volume_group=cinder-volumes-netapp
volume_driver=cinder.volume.drivers.lvm.LVMISCSIDriver
volume_backend_name=LVM_netapp
2) How does migration between different multiple backends work? Let's say
the an SSD volume is attached to a VM I want to migrate all the data in the SSD
volume to a SATA volume without bringing down the interface. Do I have to
manually mount/un-mount the persistent volume to the instance- how do paths are
maintained? For instance, let's say the persistent volume was /dev/vdx mounted
to /mnt/vol0 , how does it re-appear ?
As far as I know, you have to manually copy it from one block storage to the
other by mounting the new one.
Thanks a lot in advance!
Narendra
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