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  3. March 2009

Re: AS400/i5 etc general behaviour

Hi, Walden:

Teraspace is a special kind of temporary storage -- it does not map directly to an MI object; and is not really part of "single level storage" per se; it is apparently some kind of interface to the lower-level SLIC routines that provides a kind of temporary per-process (job) "heap" memory.

I really do not know what is going on "under the covers" ... :-o

Perhaps some of the IBMers who regularly "lurk" on these lists might be able to comment on this?

Mark

> Walden H. Leverich wrote:
Once assigned a virtual address (MI pointer), and real DASD pages get assigned and allocated to that object, these pages never "move around"

So if I have an RPG program that allocates 4GB of memory (terraspace
enabled, obviously) then I just ate 4Gig of disk too? No way around
that? What if I want a sparse file? IOW, all memory allocations on i are
basically memory-mapped files?

-Walden


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