Answer / maharaja pandian srithar

, i like the integration of the SunCluster more than VCS.
like blowtorch said, the SunCluster is a kernel cluster
which gives you very fast error detection, VCS just
monitors the environment with "scripts" and daemons. to say
that VCS uses "no kernel-level integration" is not true at
all, because the cluster communication uses two kernel
modules called "gab" and "llt"; anyhow, these two modules
comes with the VCS but can be also found at some other
products..
VCS has a nice user interface (GUI) and is "easy" to
manage, where the SunCluster is a bit more "unix like".
it's true to say that VCS was one of the best cluster
solution in the past, comparing it to SunCluster 2.2. but
since SC 3.0 the SunCluster became better and better.
Looking at SC_3.1-U4 vs. VCS 4.1 i would miss nothing in SC
what i need in a cluster environment. The latest version of
SunCluster is 3.2 (released in 01/07), which brings a lot
of new features. no question, VCS 5.0 is a massive product,
but i when i am reading the release notes of VCS, i always
think about a big table where 100 product managers think
about new features no one really needs; reading the
SunCluster release notes reminds me on 100 engineers
planning how they could increase the availability of a
cluster environment.
another point to think about are the costs, with VCS you
must buy VxVM aswell, and every nice feature is an extra
license (best example io-fencing) licenses based on tier
levels... SunCluster could be used for free inside the Java
Enterprise System without support... if you buy SunCluster,
you get all features it would provide for one price... the
SunCluster uses standard features from solaris like IPMP,
MPxIO, UFS or SVM/LVM, with VCS you get thinks like VxVM,
VxDMP, GAB/LLT or even VxFS
at the end of the day, i like to get support for all
products from one hand, there can be no finger pointing in
extreme emergency....

but once again, many of my costumers are very happy with
their VCS and many are very happy with SC... It's purely a
matter of taste....

For maintenance purpose the system will be down and up as per weekly or monthly in production mode ,what are the needed points to mind ,what are that?

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