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  2. MIDRANGE-L
  3. July 2020

RE: Mixing SSD & Spinny

Why keep OS on SSD?

A lots gets cached out. Even if you have a crud load of memory. Let's look at DSPSYSSTS.

Here you see a bunch of memory, about 134GB. Very low paging and faulting.
System Pool Reserved Max -------DB------- -----Non-DB-----
Pool Size (M) Size (M) Active Faults Pages Faults Pages
1 7259.4 3775.8 +++++ .0 .0 .0 .0
2 44467.5 21.4 7987 .0 9.2 .0 .0
3 32632.3 .0 558 2.7 5.5 3.6 15.6
4 1331.0 1.2 104 .0 .0 .0 .0
5 47413.6 3.3 2863 .0 .0 8.3 8.3

However let's look at this other part of DSPSYSSTS.
Current temporary used : 191816 M
Peak temporary used . : 207133 M

Roughly 200G of temporary storage. The amount your system will use for temporary storage is related to the amount of free space your system has. Our temp storage usage may be more than some other people's system size. And our peak was recently reset by an IPL.


Rob Berendt

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