Berry van Sleeuwen wrote:
As for the reason why anyone would stay on for instance solaris. In some
cases it can be "just because we've done this already". Or perhaps
because of some tools that are in use. And in some cases there can be a
problem with a software product that is not (yet) supported on Z or on
the specific Linux release. I don't think it's related to the
capabilities of Linux on Z as such. But sometimes tuning can be a
problem because tuning in a shared environment can mean you'd have to
find new settings and knobs. At the very least I'd move a large database
to the mainframe to take advantage of the IO capabilities of the
mainframe. But make sure you know and understand tuning before moving
large databases (just to avoid a disapointed customer due to performance
issues).
But in the end it all has to do with cost. So make sure you get the
numbers. And make sure you get ALL numbers, not only CPU or DASD but
also the costs (or rather savings) in floorspace and power. Remember
that you are not necessarily be better off with just one Linux machine
on an LPAR. The added bonus is that you can run multiple machines,
either on VM or multiple LPAR's, with shared resources (CPU, storage,
floorspace, power etc). Some people tend to look only at one server for
their calculations and ignore the fact that you can (and will) be
sharing resources. So present the big picture to your management.
Solaris does not necessarily mean *sparc*:-)
I don't know how CPU power/costs compare between intellish CPUs and
*sparc* but I gather Intellish has it all over IBM's mainframes. A CPU
hog in your Xeon will be a bigger CPU hog on a Zed. You don't see many
zSeries listed at top500.org. Nor *sparc*.
I know the application need not be on the same system as the database,
but the application/database configuration does need to be taken into
account.
--
Cheers
John
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