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Am 30.03.2023 um 21:31 schrieb x y <xy6581@xxxxxxxxx>:

Does scatter-loading make a difference?

Well, this is a similar question to "is disk access from a striped disk set faster than a single one?".

The answer is theoretically, and practically proven "yes".

Even and especially the older AS/400 system (combination of hard-, firm-, and software) makes heavy usage of the capabilities the SCSI bus and protocol provide, to lessen average storage-latency. I wouldn't wonder if the code running on the (MF)IOP also considers physical disk geometry to order requests before submitting them to the device. If this makes sense with SCSI disks, which AFAIR can do this by themselves (Tagged Command Queueing).

Have the mechanics of IBM's scatter-loading been published?

Not in detail. Just enough to IBM can boast about it. ;-) The most in-depth description you can get officially is the books from Frank Soltis (Fortress Rochester, Inside the AS/400).

:wq! PoC

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