[one-users] How to use ceph filesystem

[Mario Giammarco]

My problem was that  because ceph is a distributed filesystem (and so it
can be used as an alternative to nfs) I supposed I can use as a shared
system datastore.
Reading your reply I can see it is not true. Probably official
documentation should clarify this.

Infact I hoped to use ceph as system datastore because ceph is fault
tolerant and nfs is not.

Thanks for help,
Mario


2013/12/3 Kenneth <kenneth at apolloglobal.net>

>  Ceph won't be the default image datastore, but you can always choose it
> whenever you create an image.
>
> You said you don't have an NFS disk and your just use plain disk on your
> system datastore so you *should* use ssh in order to have live
> migrations.
>
> Mine uses shared as datastore since I mounted a shared folder on each
> nebula node.
> ---
>
> Thanks,
> Kenneth
> Apollo Global Corp.
>
>  On 12/03/2013 03:01 PM, Mario Giammarco wrote:
>
> First, thanks you for your very detailed reply!
>
>
> 2013/12/3 Kenneth <kenneth at apolloglobal.net>
>
>>  You don't need to replace existing datastores, the important is you
>> edit the system datastore as "ssh" because you still need to transfer files
>> in each node when you deploy a VM.
>>
>
> So I lose live migration, right?
> If I understand correctly ceph cannot be default datastore also.
>
>>  Next, you should make sure that all your node are able to communicate
>> with the ceph cluster. Issue the command "ceph -s" on all nodes including
>> the front end to be sure that they are connected to ceph.
>>
>>
>>
>
> ... will check...
>
>
>>
>> oneadmin at cloud-node1:~$ onedatastore list
>>
>>   ID NAME                SIZE AVAIL CLUSTER      IMAGES TYPE DS
>> TM
>>
>>    0 system                 - -     -                 0 sys  -
>> shared
>>
>>    1 default             7.3G 71%   -                 1 img  fs
>> shared
>>
>>    2 files               7.3G 71%   -                 0 fil  fs       ssh
>>
>> * 100 cephds              5.5T 59%   -                 3 img  ceph
>> ceph*
>>
>> Once you add the you have verified that the ceph datastore is active you
>> can upload images on the sunstone GUI. Be aware that conversion of images
>> to RBD format of ceph may take quite some time.
>>
>
> I see in your configuration that system datastore is shared!
>
> Thanks again,
> Mario
>
>
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