Hi guys, 

I was wondering if this is a bug? 

I've noticed that during volume migration from NFS to RBD primary storage the 
volume image is first copied to /tmp and only then to the RBD storage. This 
seems silly to me as one would expect a typical volume to be larger than the 
host's hard disk. Also, it is a common practice to use tmpfs as /tmp for 
performance reasons. Thus, a typical host server will have far smaller /tmp 
folder than the size of an average volume. As a result, volume migration would 
break after filling the /tmp and could probably cause a bunch of issue for the 
KVM host itself as well as any vms running on the server. 

It also seems that the /tmp is temporarily used during a template creation . 

My setup: 

ACS 4.2.1 
Ubuntu 12.04 with KVM 
RBD + NFS for Primary storage 
NFS for Staging and Secondary storage 


Thanks 

Andrei 

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