I got asked:
“Does z/VM impose non-insignificant overhead? Is it similar to VMware,
in
which virtual I/O imposes significant overhead, but most processor and
memory access runs at close to native physical speed?”
I don’t know anything about VMWARE so I could not answer the question.
I
know that CCW Translation in VM costs significant cycles.
I think FCP disks < dedicated DASD < fullpack minidisks < small minidisks
.
I would HOPE that the zSeries, with so much of virtualization built into
the hardware, would have lower costs than VMWARE, but I don’t really kn
ow.
Any takers?
Are there any web sites that give performance comparisons VM versus VMWAR
E?
Alan Ackerman
Alan (dot) Ackerman (at) Bank of America (dot) com
