> I wanted to know if there are specific hardware requirements for
> setting up sun clusters (2.2). I was told by somebody that clustering
> works only with E3500 systems or above. I have a couple of E250s, two
> E220s, 1 E420 and some ultra-5s. I can understand identical/similar
> machines required within a cluster -- but why only E3500 or above?
> Cannot I cluster two E250s in a single cluster?
> I was looking thru the Clustering 2.2 doc -- but I did not see any
> specific hardwire restrictions.
Cluster 2.2 is fairly flexible in what hardware can be used - however
for it to be supported (and hence 'guaranteed') by Sun you need to stick
with certain configurations. This is a good idea - considering the
purpose of clustering (in Sun's terms) is to provide a very available
(hence stable) environment.
As mentioned in a previous reply, you will have problems trying to build
an asymmetric cluster. The most obvious system difference is the bus
type. As quoted from the Cluster 2.2 course notes - "You cannot mix
systems that use PCI bus technology, such as the E450, with SBus
technology systems, such as the E3000. Many of the interface cards, such
as the storage array interfaces, are not compatible when connected to
the same storage unit."
Hence, a cluster can be built from a E250 & E450, or a Ultra5 & Ultra10,
or a E3500 & E6500, and perhaps even a Ultra10 & E450 (???). However you
cannot / should not build a cluster including an E450 and a E6500 (for
Sun are quite picky about what type of Cluster configurations they will
support. Bottom-line, therefore is that you should talk to your Sun
representive. As a side-note, you really need to be 'serious' about
implementing the Cluster product properly, including the amount of money
you throw at it - otherwise you're just wasting your time.
Just my two cents worth...