[Users] deduplication

[suporte at logicworks.pt]

Hi Theron, 

Thanks, that's what I thought. So with dedup we save space in the storage and what about performance, will it increase performance? once it will not use the same instance twice, is that right? i.e., if I have 2 VM's (let's say, Fedora 18), with the same kernel, does oVirt run 2 times the 2 instances or can it manage that so it will not have to run the same software twice, in order to save resources and performance. 

I'm not sure if my English is enough for you to realize what I'm trying to explain. 

Regards 
Jose 

----- Original Message -----

From: "Theron Conrey" <tconrey at redhat.com> 
To: suporte at logicworks.pt 
Cc: Users at ovirt.org 
Sent: Sábado, 25 de Maio de 2013 21:00:39 
Subject: Re: [Users] deduplication 

Hi Jose, 

Deduplication or dedup for short is usually a function of the storage appliance, and as such is a "post-allocation" operation. As a quick example the hypervisor will request the space, allocate all of it, and if space can be reclaimed via a storage side operation like dedup, that's where it's handled. 

If you're leveraging oVirt with storage appliance that supports dedup it will work just fine with oVirt as well. 

We DO however support thin provisioning. This is a "pre-allocation" operation handled by oVirt. Instead of just waiting on the storage to reclaim space via a dedup job (if this isn't done inline dedup can be taxing on the storage array and is usually a scheduled job that isn't constant) thin provisioning only allocates the storage space that is actually required. 

More information can be found on our wiki here: http://www.ovirt.org/Vdsm_Disk_Images 


Theron Conrey 
Open Source and Standards, Red Hat 
@theronconrey 



----- Original Message ----- 
From: suporte at logicworks.pt 
To: Users at ovirt.org 
Sent: Saturday, May 25, 2013 9:02:40 AM 
Subject: [Users] deduplication 

is deduplication possible? 

Regards 
Jose 

-- 

Jose Ferradeira 
http://www.logicworks.pt 


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