FLASH disk as swap

[Stephen]

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