Re: Tuning for mid-size server

Scott,

> Also, if it's a read only environment, RAID5 with n drives equals the
> performance of RAID0 with n-1 drives.

True.

> Josh, you gotta get out more.  IA32 has supported >4 gig ram for a long
> time now, and so has the linux kernel.  It uses a paging method to do it.
> Individual processes are still limited to ~3 gig on Linux on 32 bit
> hardware though, so the extra mem will almost certainly spend it's time as
> kernel cache.

Not that you'd want a sigle process to grow that large anyway.

So what is the ceiling on 32-bit processors for RAM? Most of the 64-bit
vendors are pushing Athalon64 and G5 as "breaking the 4GB barrier", and even
I can do the math on 2^32.   All these 64-bit vendors, then, are talking
about the limit on ram *per application* and not per machine?

This has all been academic to me to date, as the only very-high-ram systems
I've worked with were Sparc or micros.

--
Josh Berkus
Aglio Database Solutions
San Francisco