Fodor Zsuzsa <email@example.com>
Kedves Kollégák, megint szeretnék megosztani Veletek egy hírt:
>2400 napja folyamatosan üzemelő VMS cluster Amszterdamban,
oprendszer és alkalmazás upgrade-ekkel, fizikai költözéssel. +
gondolatok a költségekről...
---------- Továbbított levél ----------
Dátum: Wed, 3 Dec 2003 11:38:06 -0500
Feladó: Skonetski, Susan <firstname.lastname@example.org>
Címzett: Skonetski, Susan <email@example.com>
Tárgy: OpenVMS Pearl - ok for external use
I do not normally forward articles from the Inquirer but this is a good
one on OpenVMS Clusters. http://www.theinquirer.net/?article=13002
OpenVMS clusters give Windows, Unix thorough thrashing
The OS that dare not speak its name
By uromole: Wednesday 03 December 2003, 10:39
EVERYONE IS TALKING about Windows clusters, Unix clusters and Linux
cluster. But all we are saying, is that the 20 year-old architecture of
clustered OpenVMS can teach these whippersnappers a thing or two.
At OpenVMS.org there's a report about an OpenVMS cluster which
handles the major processing for the Greater Amsterdam Police and
naturally is required 24 hours a day, seven days a week.
What is unusual about this cluster is that it has been running since
April 1997 despite the addition of machines, upgrades to the operating
system, upgrades to applications, a changeover to a SAN architecture
and even the physical relocation of the machines to a new site some
seven kilometers away. Yet, through all these changes the cluster has
provided continuous IT services to the Amsterdam rozzers.
The current up-time for the cluster is about 2430 days, or more than six
years, with the installation of the oldest hardware, an FDDI
concentrator, only 1650 days ago, while the oldest computer system
was installed about three years ago.
The planning and execution of these changes would have no doubt
presented their own challenges. But it appears the most difficult part
was explaining to managers why it was unnecessary to shut systems
down, even during the physical relocation.
This report becomes even more interesting when we factor in the
conclusions from a study by TechWise Research entitled "Total Cost of
Ownership for Enterprise Class Clusters" that was released in January
2002. This study is slightly dated and so we hope that it is updated
soon and will include data about Linux clusters.
The TechWise report was based on 93 interviews and looks at the
costs of ownership over a five year period for machines from Compaq
(as it was then), Hewlett-Packard, Sun and IBM, with approximately
equal numbers of systems from each manufacturer.
In our experience, the report from TechWise is unusual in that it takes
into account the actual costs of downtime as discovered in those
interviews. It reached the startling conclusion that if downtime costs
$50,000 per hour for a medium size enterprise system, then based on
the average reported downtime, this is equivalent to 50% of the total
cost of ownership over five years. If downtime rises to $100,000 per
hour then on average it accounts for 80% of total costs. By contrast
the acquisition is 26% in the first instance and just 10% in the second.
It seems that the financial advantage of Linux might be far less than
people imagine especially if it accrues more than the average of 9.2
hours of downtime used in the above calculations, but that's a story for
The upshot of the TechWise report was that when the average cost of
downtime, $71,000 per hour, is included in the total cost of ownership
over five years, the OpenVMS clusters are a clear winner. That's mainly
due to their average annual downtime being 11.0 hours compared to
the IBM clusters at 18.4 hours, HP clusters at 22.8 hours and Sun
clusters at 28.7 hours.
Depending on the cluster configuration, the financial advantage of
running OpenVMS was between $1.7 million and $6.8 million.
Your mileage may vary of course and these figures are somewhat
dated, but they do give cause for thought -- both in relation to the
clusters mentioned here and how Linux might stack up against them. It
seems reasonable to suggest that if Linux clusters are used in
environments where downtime is expensive, then it would only take
about 25 hours downtime per year before the cost advantage of using
Linux might be completely negated.
As to the cluster operated by our Dutch friends, if that operated in a
commercial environment and had no downtime in five years, then
compared to clusters from other manufacturers with their average
downtime, the savings could easily exceed $10 million.
That's an amount that buys quite a few applications and certainly
covers the costs of personnel.
These stark facts may also shake HP from construing VMS as Vendor
Marketing Silence, and maybe make them think the neglected OS could
be a Veritable Money Spinner. ľ
Report from OpenVMS.org
Report from TechWise Research(pdf)