Hi,
We use 2nd level VM for test, preparation of VM upgrades, etc. - in
respect to that it is a VERY strong capability, which also shows the
maturity of the System z virtualization. But personally I would on the
other hand never consider running production in 2nd level.
According to my measurement a 2nd level guest risk running many
magnitudes slower than a first level guest. But it depends on the
workload characteristic. If you want to see some measurements, you can
refer to section 5.4 in my masters thesis:
http://www2.imm.dtu.dk/pubdb/views/edoc_download.php/5483/pdf/imm5483.pdf .
You'll probably find some factual inaccuracies in the thesis (it was
never reviewed by VM/zLinux experts), but the measurements and numbers
are correct.
/Klaus
Owen, Jerry W. (AITC) wrote:
For all of you old timers that have used VM since it landed on
Plymouth Rock, what are the pros and cons of using a second level VM
system?
Thanks in advance.
