Re: ATA over Ethernet (aoe) Experience?

["Kent Borg" <user=107@nabble.blu.org>]

 Kristian Erik Hermansen wrote: 
> Cool idea, and please let us know if you implement it and the result 
> works.  But I feel compelled to also point you to vmware's vmotion 
> product :-) 
>   

Looking quickly at Vmotion it seems that Vmotion starts out requiring a 
box to serve up disks  I am only being medium ambitious here.  I want to 
have two identical servers that can stand in for each other with no 
single points of failure.  Put some central disk server in the mix and I 
start to want two of them in case one dies.  The cost of minimal 
hardware of a completely redundant system goes up by thousands. 

(Also, Vmware always ignores the resumes I send them.  If they don't 
like me, I am not so enthusiastic about them.) 


A point on motivation: Upgrading software.  Say the host OS needs an 
upgrade, or the virtualization software itself has a new revision. 
Those are cases where the whole world might really be happier with a 
reboot of the guest.  Vmotion seems to be a load balancing feature. 
Trying a live migration for an upgrade seems greedy.  In those cases I 
think it is reasonable to reboot the guest OS.  Yes, you can't do many 
reboots and still do "five-nines", but people who think they have that 
reliability are usually fooling themselves.  A little scheduled downtime 
is usually something that can be arranged, and a system that assumes a 
reboot is occasionally allowed can be so much simplier--and simplicity 
breeds reliability. 


-kb, the Kent who is coming around to thinking Virtualbox is pretty damn 
cool. 


P.S.  It is still annoying that only one copy of Virtualbox can be 
installed at once on a host machine.  Qemu doesn't have that 
limitation...though in the 
most recent copy of Qemu that I have tried dereferencing a -1 kills the 
entire guest OS.  Yes, really. 

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