clarifications about storage and backends [closed]

asked 2014-07-10 09:12:03 -0500

capsali gravatar image

updated 2014-07-11 16:47:34 -0500

smaffulli gravatar image

I managed to setup an openstack environment on 7 nodes= 2 controllers, 3 compute, 1 cinder storage ans 1 swift node. I'm a little confused about storage types. I understand swift as its a object storage node and used as backend for glance images storage.The cinder node provides block storage as volumes for the VM's. And the storage on the compute nodes is used as root volumes for spawning the vm's. On the dashboard, under hypervisors, i can see the available space on each compute node, the free space under /root directory. When i create a new instance, based on the flavor i choose, the vm start eating space from the compute nodes, and after terminating the instance the space is freed up (i guess this is the ephemeral storage, although under details it says it's root storage).

The cinder-volume node sits on a software raid 10 array with lvm on top. Recently i started reading about ceph, that it can be used as a backend for cinder, glance and swift. I am happy with swift the way it is, but are there any advantages for using ceph instead of LVM? Does Ceph have any kind of fault tolerance,or should it sit on raid array aswell?

As for the hypervisor storage, is there any way of making it a shared filesystem so i can take advantage of live migration? I guess it wouldn't be that simple as adding the /root directory under the same LV on each compute node? Can i use Ceph for this?

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Closed for the following reason too subjective and argumentative by smaffulli
close date 2014-07-11 16:50:17.167287


The answer is yes :) I suggest you to study Ceph and ask here questions that are concrete problems that can have one answer (not a conversation). Read

smaffulli gravatar imagesmaffulli ( 2014-07-11 16:50:11 -0500 )edit

Ok...sry for being so vague...shall i delete the thread?

capsali gravatar imagecapsali ( 2014-07-11 17:07:50 -0500 )edit

N pt a problem, don't worry. If you have issues experimenting with ceph and cinder/swift ask here.

smaffulli gravatar imagesmaffulli ( 2014-07-11 17:57:28 -0500 )edit