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I 'believe' why it degrades is that your system now notices that disks are
unbalanced, capacity wise. Therefore all new writes go on to the disks
with the lowest percentage of use. (Note: This percentage of use is a
major reason why it is bad practice to mix different sizes of disks on
your system, unless you do stuff like set up IASP, or ASP to segregate
storage.)

Keep in mind this, how does the person who writes the checks want the
system balanced? What this means is that your performance data may show
certain files being hammered. However, if the officer who approves system
expenditures approved the purchase of SSD's to get such and such a process
to run faster then you'd better ensure that data is on SSD. In our shop
performance data showed that stream files used by Domino should be put on
SSD but the check fellow approved the purchase with the understanding that
month end would be reduced. So we had to ignore the performance data and
put month end data on SSD.



Rob Berendt

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