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Hello Jim,
Am 02.07.2020 um 15:14 schrieb <midrangel@xxxxxxxxxxxxxxxxx> <midrangel@xxxxxxxxxxxxxxxxx>:
Patrik: The OS should always be on the fast I/O technology. If you slow down the OS, well, it follows that you slow the entire system down. Single level storage and memory management both come into play here.
I second your explanation about why mixing SSDs and spinning disks in the same ASP (or even RAID) doesn't make much sense. Neither on IBM i, nor on other OS's: This isn't exactly a side issue of SLS.
About putting the OS always on the fast I/O: That heavily depends on different factors. As far as I've learned, RAM equals disk read cache in IBM i. If parts of the OS are called frequently, and there's enough RAM, they'll never be paged out, so there will be no performance impact. All rarely needed OS parts can stay on cheaper spinning disks.
Then, I tend to put Linux VMs on SSDs also, but mostly because installing updates is so comfortably fast. ;-)
:wq! PoC
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