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From Clayton Weise <cwe...@iswest.net>
Subject RE: Multiple secondary storage
Date Thu, 20 Sep 2012 15:56:16 GMT
When you say "random" is there any logic or reasoning behind the choice it makes?  Does it
do some kind of round robin, or pick based on which secondary storage repo has the most space
available?  Or is it really just completely random... and if it is, why?

-----Original Message-----
From: Nitin Mehta [mailto:Nitin.Mehta@citrix.com] 
Sent: Thursday, September 20, 2012 3:12 AM
To: cloudstack-users@incubator.apache.org
Subject: RE: Multiple secondary storage

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
Chief Technical                                             Office    +44(0)2034687000
Veber: The Hosting Specialists               Fax         +44(0)871 522 7057
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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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