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> Date: Wed, 4 Nov 2009 13:51:33 -0500
> From: h...@unity.ncsu.edu
> To: vcl-dev@incubator.apache.org
> Subject: Re: Fwd: Image Loading Times
> Cliff writes:
> > I'm running image loading tests and I am noticing that it 
> > takes about 10 minutes to load an 8 gig VCL image from the 
> > storage appliance.
>   My experience is from 8 to 18 minutes to load a (bare metal) image
> depending on the size of the image.  (This is one reason to make images
> somewhat single purpose and to strip out what's not needed.)  VMware
> guest images load considerably faster.
> > We are using a 1G backbone on the system, and some of the 
> > people backing our test program are wondering if we can speed 
> > this up a bit since they are uncomfortable with the 10 minute 
> > load times.
>   My understanding is that there are a number of factors at play, the
> backbone, the I/O of the disks and the computers, ...
>   We treat this as a "cultural" issue, and try to get users to
> understand that they either should make an advanced reservation (very
> few do :-) or do something else in the 10 or so minutes.
>   Since people are already on a computer, most of them can easily spend
> the time on their e-mail, web surfing, whatever.  (A not-uncommon result
> is that they forget about their reservation and it times out before they
> check it. :-)
>   The one time this wait for loading is really not acceptable is for a
> scheduled class - and that's the reason for the Block Reservation which
> allows the multiple reservations for the class to be loaded in advance
> so they are availble for login at the specified time.  Then there is no
> load needed, and it takes only about a minute for the login process.
> > Are these speeds OK? What are you all experiencing? 
> > 
> > Do we need to drop a few G's on a 10G backbone?
>   Somebody else should discuss what good this might do, and perhaps also
> discuss the types of disks that can be used and speeds.
> -- 
> --henry schaffer
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