The problem with putting all your paging volumes on one DS-8000 then
becomes performance. Your paging devices will now be sharing physical
disks. When you write pages out to multiple "page devices", then all of
the I/O is then going to the same set of hardware.
From a performance perspective, you want to alternate page devices
across ranks of physical devices.
It is rare that you will lose the DS-8000. If you do, there are a lot of
other things to worry about. Would be less optimal to have bad paging
performance because of worrying about an outage that is very unlikely to
happen.
Florian wrote:
Thank you,
This is what I expected. I fear also that the chance is doubled to crash the
system when the PAGING volumes are spread on both DS-8000. So I will correct
this soon.
