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From Nitin Mehta <Nitin.Me...@citrix.com>
Subject RE: Multiple secondary storage
Date Fri, 21 Sep 2012 09:53:42 GMT
Answers inline

-----Original Message-----
From: Bryan Whitehead [mailto:driver@megahappy.net] 
Sent: Thursday, September 20, 2012 11:42 PM
To: cloudstack-users@incubator.apache.org
Subject: Re: Multiple secondary storage

By random you mean given equal usage or some factors like that right?
>> You are right.

If one of the secondary storage nodes is filling up I'd hope the empty one would be weighted
more in a random selection...
>> Multiple secondary storage was recently added and its yet to go further refinement.
I would assume future work would involve more sophisticated way of choosing sec  storage depending
on the consumption, usage etc. 

On Thu, Sep 20, 2012 at 3:11 AM, Nitin Mehta <Nitin.Mehta@citrix.com> wrote:
> Tamas - That's not entirely correct.
> All the public templates will be replicated to all the secondary storage for redundancy
but private templates would be kept in one of the randomly chosen secondary storage.
> Snapshots will be randomly copied to one of the secondary storage (the 
> chain of incremental snapshots are kept on the same secondary 
> storage.)
>
>
> -----Original Message-----
> From: Tamas Monos [mailto:tamasm@veber.co.uk]
> Sent: Thursday, September 20, 2012 3:11 PM
> To: cloudstack-users@incubator.apache.org
> Subject: RE: Multiple secondary storage
>
> Hi,
>
> As far as I am aware if you are using more than one secondary storage then the system
will use both storage but will not replicate any data.
> This means if your snapshot is stored on a secondary storage that is in Error state/down
then any operation related to that data (template,ISO,snapshot) will error out/fail and there
is no way to recover from it unless you bring the storage back online or via database hack.
> You will still see everything on the GUI as it does come from the database so make sure
your storages are running. Use NFS failover or redundant storage hardware.
> I'm not sure about the latest version I'm on 3.0.2
>
> Regards
>
> Tamas Monos                                               DDI         +44(0)2034687012
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>
> -----Original Message-----
> From: Bryan Whitehead [mailto:driver@megahappy.net]
> Sent: 20 September 2012 09:45
> To: cloudstack-users@incubator.apache.org
> Subject: Multiple secondary storage
>
> If I add more than 1 secondary storage to a zone, are they all treated different? Is
there replication going on like copying templates and snapshots between the two?
>
> If I have a template or snapshot on a secondary storage that is down do i still see it
in the GUI but am just unable to use it?
>
> -Bryan
>
>

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