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  3. March 2009

Re: AS400/i5 etc general behaviour

Charles Wilt wrote:

The difference between the single level store the i uses and the swap
file system used by other systems, is that when the i swaps data out
of memory, it only exists in one place on disk. Whereas with other
systems, data is swapped out of memory into a specific swap file on
disk plus the original copy of the data still resides on the file
system. In other words, with the i, a particular piece of data exists
at a given time either on disk, or in memory.

Shouldn't that be "...with the i, a particular piece of data exists at a given time either on disk, or on disk _and_ in memory."? I don't think it's wiped from disk when it's paged into memory. I think it's more that whenever it's paged into memory, that becomes the page-image that everything (most things?) recognize as the "real thing". And unless it actually changes, it shouldn't ever be paged back out.

Tom Liotta


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