[one-users] ssh and shared data storage

[Tino Vazquez]

Hi Antanas,

Using ssh drivers and persistent images does not mean that the copy is
not necessary, since the image DS doesn't have to be accesible as a
local filesystem in the virtualization node. On VM shutdown, if the
image is persistent it will be copied back to the datastore to avoid
losing changes.

hih,

-Tino



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On 11 June 2014 15:34, Antanas Masevicius <antanas.masevicius at ntt.lt> wrote:
> Hello,
>
> been struggling to resolve situation with persistent images. That is
> images gets copied (during instantiation) after setting DS to ssh, even
> on local storage.
> At first i had only machine with local data storage which look like:
>
> oneadmin at xen-host0:~/datastores/0/42$ onedatastore list
> ID NAME SIZE AVAIL CLUSTER IMAGES TYPE DS TM
> 0 system 110.1G 20% - 0 sys - shared
> 1 default 110.1G 20% - 8 img fs shared
> 2 files 110.1G 20% - 0 fil fs shared
>
> then, i added another xen host for which i have set data storage TM to ssh:
>
> oneadmin at xen-host0:~/datastores/0/42$ onedatastore list
> ID NAME SIZE AVAIL CLUSTER IMAGES TYPE DS TM
> 0 system 110.1G 20% - 0 sys - shared
> 1 default 110.1G 20% - 8 img fs shared
> 2 files 110.1G 20% - 0 fil fs shared
> 100 xen1_ds_syste - - A_cluster 0 sys - ssh
>
> This did not let me deploy image to remote (new) host. Someone suggested
> i have to set image DS to ssh:
>
> oneadmin at xen-host0:~/datastores/0/42$ onedatastore list
> ID NAME SIZE AVAIL CLUSTER IMAGES TYPE DS TM
> 0 system 110.1G 20% - 0 sys - shared
> 1 default 110.1G 20% - 8 img fs ssh
> 2 files 110.1G 20% - 0 fil fs ssh
> 100 xen1_ds_syste - - A_cluster 0 sys - ssh
>
> Now, i was able to instantiate image on remote host. This is fine, but,
> when i tried to instantiate image for local host, it also started to
> copy persistent images on instatiation.
>
> What is practice for such cases? Should i run everything on shared media
> only or maybe there is some other way to achieve this compatibility?
>
> best regards,
> Antanas
>
> --
> Antanas Masevičius
> Technikos direktorius
> UAB "Nacionalinis telekomunikaciju tinklas"
> Tel.  +370 5 2056000
> Tel.  +370 700 00031 (tiesioginis)
> Fax.  +370 700 00034
> el.p: antanas.masevicius at ntt.lt
> www.ntt.lt
> www.spykas.com
>
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