FLASH disk as swap

[James Finstrom]

In my experience if you are regularly using the swap you need more ram. You
would do better to add a gig of ram then a flash device. this assumes you
dont have some extraordinary use which requires allot of data movement
making the swap necessary in which case I would still look at adding more
ram or another hard disk. Hard drives are going for .10-.50 a gig definately
worth it

On Thu, Dec 3, 2009 at 8:35 PM, Stephen <cryptworks at gmail.com> wrote:

> I do but its in production as a xenserver...
>
> when we migrate the VM's off of it ill have some time to do this
> experiment.
>
> On Thu, Dec 3, 2009 at 7:30 PM, Bob Elzer <bob.elzer at gmail.com> wrote:
> > What about a large database maybe a couple of terabytes, and maybe lots
> of
> > users.
> >
> > And then lets say we spread our 6GB of swap over several disks.
> >
> > Maybe a system with 32GB of memory, and dual quad processors.
> >
> > Maybe we could run some tests, anybody have a system like this ???
> >
> > What does ebay and amazon and new egg run on, I heard they were doing
> lots
> > of processing for black Friday ?
> >
> > Well maybe.
> >
> >
> >
> > -----Original Message-----
> > From: plug-discuss-bounces at lists.plug.phoenix.az.us
> > [mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of Kurt
> > Granroth
> > Sent: Thursday, December 03, 2009 5:06 PM
> > To: plug-discuss at lists.plug.phoenix.az.us
> > Subject: Re: FLASH disk as swap
> >
> > On 12/3/09 9:39 AM, der.hans wrote:
> >> Having swap be 1.5 times the size of ram is good, double the size of
> >> ram is better.
> >
> > Those are old-school heuristics from back in the day when 32 MB was a lot
> of
> > RAM.  I stretch to think of a case where 6-8 GB of swap would come into
> play
> > at *all*.  That is, if you have a case where the system is using
> multi-gig
> > amounts of swap, then I can almost guarantee that it is utterly unusable.
> > One could say that it's there as a "just-in-case"... but I'm having a
> hard
> > time buying that.  Unusable is unusable.  It would take so incredibly
> long
> > to recover that any production server would have long been rebooted or
> > managed some other way.
> >
> > I think I did 2x RAM up until I had 512MB and then 1x RAM until I got to
> > 1GB.  Then I was .5x at 2GB RAM and finally .25x now ;-)
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>
>
>
> --
> A mouse trap, placed on top of your alarm clock, will prevent you from
> rolling over and going back to sleep after you hit the snooze button.
>
> Stephen
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-- 
James Finstrom
Rhino Equipment Corp.
http://rhinoequipment.com ~ http://postug.com
Phone: 1-877-RHINO-T1 ~ FAX: +1 (480) 961-1826
Twitter: http://twitter.com/rhinoequipment
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