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> Date: Wed, 4 Nov 2009 13:51:33 -0500
> From: h...@unity.ncsu.edu
> To: email@example.com
> 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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