Open Stack

On a single node using multi-backend you should keep in mind all of your
iSCSI traffic going through that node.  Usual VG size limits apply of
course as well.  Some guidelines I've heard from various OpenStack vendors
in the past suggest 5TB max on a single cinder-volume/LVM node.  From there
add more nodes (additional nodes, not multi-backend on the same node).

One of the biggest advantages and drivers for multi-backend was due to the
fact that third party devices require little of the volume-node, using LVM
however is a different story.

On Mon, Apr 6, 2015 at 1:25 AM, Vijay Kakkar <vijaykakkars at gmail.com> wrote:

> Is there any limit as well for LVM backends ?
>
> On Mon, Apr 6, 2015 at 2:12 AM, John Griffith <john.griffith at solidfire.com
> > wrote:
>
>>
>>
>> On Sun, Apr 5, 2015 at 2:42 PM, John Griffith <
>> john.griffith at solidfire.com> wrote:
>>
>>>
>>> On Apr 5, 2015 2:10 PM, "mad Engineer" <themadengin33r at gmail.com> wrote:
>>>
>>>> Read about cinder multi backend support,for using different backend
>>>> types.
>>>> I have 2 servers for running as lvm+iscsi back ends.
>>>> Is it possible to use these 2 lvm backend nodes for same volume type
>>>> and schedule block drives between these for that volume type.
>>>> So that volumes will be distributed between these 2 nodes.
>>>>
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>>>>
>>>>
>>> For sure, if you create without a type specification the weight filter
>>> just places based on available capacity among the backends you configured.
>>> You can also have an LVM type with no backend name
>>> , so you would
>>>
>>
>> Err... that should say "same" backend name.
>>
>>
>>> just
>>>  weigh between LVM backend
>>> s
>>> .  That's actually the default example shown here
>>> :
>>> https://wiki.openstack.org/wiki/Cinder-multi-backend
>>>
>>>
>>
>>
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>>
>>
>
>
> --
> Regards,
>
> *Vijay Kakkar - RHC{E,SS,VA,DS,A,I,X}*
>
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