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From Koushik Das <>
Subject RE: Local storage support for data volumes
Date Tue, 14 Aug 2012 11:36:02 GMT
This is an initial stab at the feature. Agree there is scope for improvement and in course
of time it will mature. I guess that’s the whole point of bringing it up for discussion
in the community.


-----Original Message-----
From: Matthew Patton [] 
Sent: Monday, August 13, 2012 7:17 PM
Subject: RE: Local storage support for data volumes

Unfortunately this caught my eye.
" n disabled existing local storages are not removed but any new local storage is not added."

This qualifies as interference. Cloud software must always reflect reality. This whole distinction
between root or data being allowed as local was none of CS' business in the first place.

Of course CS should throw an exception if you try to live migrate a local storage based instance.
it can even refuse to do a cold migrate until such time as the needed code is written.

But it is uncalled for CS to disallow otherwise legal operations or to unilaterally hide key
elements because some programmer without sufficient real world experience thinks the world
should fit their preconceived notions.

Furthermore all three hypervisor flavors support movement of local VMs, not just Xen.

First rule of UI design, do not lie to the user by hiding things. First rule of software development,
programmers are generally horrible at engineering.

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