FLASH disk as swap

[Bob Elzer]

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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