Info on how to make application cluster aware

Hi All,
Can somebody provide help/pointers on how to make (java or c++) application cluster aware ?
In our application We are making cluster of two solaris m/cs
for higher availability.The application which are running on
the m/c are written in java and c++.
TIA
Regards
Praveen

Not a developer myself, but by chance do you have the API
documentation? If not here is the SC 2.2 link for the API.
http://docs.sun.com:80/ab2/coll.650.1/CLUSTAPIPG/@Ab2TocView?Ab2Lang=C&Ab2Enc=iso-8859-1
and the 3.0 data services developer guide.
http://docs.sun.com:80/ab2/coll.572.7/CLUSTAPIPG/@Ab2TocView?Ab2Lang=C&Ab2Enc=iso-8859-1
Heath

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Making the application cluster-aware

Hi,
          I have just been assigned a multi-tier J2EE application with the task of
          making it "work in a cluster". The earlier architects (if i may use the
          term), just "assumed" that weblogic would provide support for
          high-availability and they would not need to do any code changes.
          So I have this application that has about 100 EJBs - about 40 Entity Beans,
          only two SFSB and the rest are SLSB.
          What would be the best strategy to go about making this application
          cluster-aware?
          I could think of the following points so far:
          1. Identify idempotent methods in all EJBs.
          2. Make all session-stored objects serializable in the web-tier. Make sure
          objects are not too huge to be serialized (don't know if I would be actually
          able to modify - too late for that).
          3. Modify bean descriptors to make them clusterable.
          4. Make web app clusterable.
          5. Look for code that uses non-replicable services (file system access,
          sockets, etc.).
          I'm sure there must be more that I've missed. Anything more that needs to be
          added to the list above? Would there be a scenario where the EJB clients
          (other beans themselves, the web tier, RMI clients, etc) would need to be
          changed?
          I understand identification of idempotent methods would be manual (or is
          not?). But what would be the best way to modify the deployment descriptors
          of all these beans?
          TIA
          With Warm Regards,
          Manav.


Hi Manavendra,
          By default all EJBs are clusterable because the default value of
          <home-is-clusterable/> is true and <stateless-bean-is-clusterable/> default
          is true. For stateful session EJBs, you will have to configure the
          replication type to InMemory as it defaults to none. Unless you have
          specifically added these elements to turn off clustering, they should
          already be clusterable.
          Typically, you will find performance is better if the web app and EJBs are
          deployed in the same JVM, because there are no remote calls. By default
          <enable-call-by-reference/> is set to true which allows arguments to be
          passed by reference rather than copying parameters. If calls are remote,
          then <enable-call-by-reference/> must be false as pass by value will always
          be necessary in this case.
          Jane
          "Manavendra Gupta" <[email protected]> wrote in message
          news:[email protected]...
          > Jane,
          >
          > I appreciate you taking out time to reply.
          >
          > <headers trimmed>
          > > > 1. Identify idempotent methods in all EJBs.
          > >
          > > You only need to do this if your EJB clients are remote. If the client
          is
          > a
          > > web app deployed in the same JVM as your EJBs, you don't need to worry
          > about
          > > it since WebLogic will create the EJBs on the same JVM as the web app.
          > Like I said, its a multi-tier application, so there is the web-tier making
          > calls to the EJB tier (though thankfully, there is a EJB "API" layer -
          that
          > consists of multiple Session Facades, ensuring network calls are
          minimized).
          > I'm not sure if the web-tier and the EJB-tier in the same application are
          in
          > the same VM in weblogic?
          >
          > Finally, I might need to separate the two tiers physically, though I'm
          still
          > trying to find out the parameters on which I'd need to do that (when to
          farm
          > and when to cluster?).
          >
          > So, the short reply, yes, the clients would be remote.
          >
          > > > 3. Modify bean descriptors to make them clusterable.
          > >
          > > They are clusterable by default. For stateful session EJBs you will
          want
          > to
          > > use in-memory replication. You didn't mention the version of WLS you
          are
          > > using pre-6.1SP3 has a few problems with this, so you might want to
          check
          > > with Customer Support if you are using SP1 or SP2.
          >
          > Sorry about that. The OS used is RHL6.2 and we are using weblogic 6.1 with
          > SP1 (thats the only one certified on 6.2). Its intriguing when you say
          that
          > all EJBs in WL 6.1 SP3 would be "clusterable by default". How does it do
          > that? Does it generate clustering descriptors for all beans deployed?
          Could
          > you shed more light on this?
          >
          > > > 4. Make web app clusterable.
          > > If using in-memory replication for HttpSession state, make sure you set
          > the
          > > session descriptor persistence type to "replicated" not "memory". This
          is
          > a
          > > point of confusion for a lot of folks.
          >
          > Thanks for the heads-up on the that. I'll keep this in mind.
          >
          > > > 5. Look for code that uses non-replicable services (file system
          access,
          > > > sockets, etc.).
          > > EJBs should not do things like this even if not running in a cluster.
          >
          > I agree EJBs should not be doing this, and chances are they will not be
          > doing this in the code either. But I'm not sure. Also, they might be
          using
          > objects that are doing this, and I'm not sure if everything will work
          > seamlessly in that case.
          >
          > > > I'm sure there must be more that I've missed. Anything more that needs
          > to
          > > be
          > > > added to the list above? Would there be a scenario where the EJB
          clients
          > > > (other beans themselves, the web tier, RMI clients, etc) would need to
          > be
          > > > changed?
          > >
          > > If your EJB clients are remote clients, you might need to modify code to
          > > handle failover (depending on the type of EJB you are using). The
          > > examples.ejb.cluster sample that ships with WebLogic is a good example
          to
          > > look at.
          >
          > Thanks again. I'll check this one out.
          >
          > Finally, the prime reason for posting this was to gain insights into such
          a
          > situation that I was hoping someone on this list had handled before.
          >
          > --
          > With Warm Regards,
          > Manav.
          >
          >
          >

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          Platform: Weblogic 6.0sp2 in WINNT
          Hai,
          I have made IP loadbalancing ( The DNS Host entry swaps IP in intervals) as per
          the documentation. By Using the clsuter IP i have created a cluster entey in the
          wl 6.0 console and added two servers in the Cluster. Now i don't know how to make
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          option to make it cluster aware.
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          Hi Kumar , Lynch , Penfriend,
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          I would like to know changes that i have to make on JSP & servlets to make it
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          Thanx.
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          Pen Friend <[email protected]> wrote:
          >Srinivasan,
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          >
          >
          >Kumar Allamraju wrote:
          >
          >> By default ejb's are compiled with clustering options ON.
          >> So ejbc generates cluster aware stubs anyway. You don't need
          >> to do anything to deploy them in a cluster environment.
          >>
          >> --
          >> Kumar
          >>
          >> Srinivasan wrote:
          >>
          >>> Sir,
          >>>
          >>> (1) What option of the weblogic ejbc is required in my case. is
          >>> -clusterable
          >>> option suffice. Sir, Could you please mention which document are you
          >>> refering
          >>> too. ( I have only the cluster.pdf from BEA )
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          >>> the host is
          >>> load balanced then will placing the same JSP and servlet in both the
          >>> servers in
          >>> cluster suffice.
          >>>
          >>> Thanks for the Help sir.
          >>>
          >>> regards,
          >>> srini
          >>>
          >>> "Lynch" <[email protected]> wrote:
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          >>> generate
          >>> > the stub classes.
          >>> >2. Web cluster demands load balancing and fail-over. You need to
          >do
          >>> lots
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          >>> >
          >>> >Hope this helps,
          >>> >Lynch
          >>> >
          >>> >
          >>> >"Srinivasan" <[email protected]> ¼¶¼g©ó¶l¥ó
          >>> >news:[email protected]...
          >>> >>
          >>> >> Platform: Weblogic 6.0sp2 in WINNT
          >>> >>
          >>> >> Hai,
          >>> >>
          >>> >> I have made IP loadbalancing ( The DNS Host entry swaps IP in
          >>> intervals)
          >>> >as per
          >>> >> the documentation. By Using the clsuter IP i have created a
          >>> cluster
          >>> >entey
          >>> >in the
          >>> >> wl 6.0 console and added two servers in the Cluster. Now i don't
          >>> know
          >>> >how
          >>> >to make
          >>> >> my EJB Cluster aware?. what parameters should i change in teh XML
          >>> file
          >>> >and
          >>> >compilation
          >>> >> option to make it cluster aware.
          >>> >>
          >>> >> Also i would like to know whether Will it be enough if i put teh
          >>> same
          >>> >copies of
          >>> >> JSP and servlets in both machine to make that too cluster aware.
          >>> Will
          >>> >there be
          >>> >> any probelm in session ?
          >>> >>
          >>> >>
          >>> >> Regards,
          >>> >> srini
          >>> >
          >>> >
          >>
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Attachments:
shift register attempt.JPG ‏64 KB
original attempt.JPG ‏42 KB
Output only current iteration data.JPG ‏86 KB

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CLA, LabVIEW Versions 2010-2013
Attachments:
plot with SR.png ‏29 KB

How to make 2 Node File Cluster with SAS Disks

Hello,
I cant fine any detailed, specific information and answer on this question
I have 2 Servers, Say HP, with 4 SAS disks each, 1 for OS (2012R2Data) and 3 available.
I want to create fault tolerant SMB 3.0 share for my Hyper-v nodes, to make hyper-v FT cluster afterwards.
So, I see inr equirements that SAS disks will work, but during creating cluster, I can not manage Cluster to see disks from both servers (total 6 free units)
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thanks

Hello,
I cant fine any detailed, specific information and answer on this question
I have 2 Servers, Say HP, with 4 SAS disks each, 1 for OS (2012R2Data) and 3 available.
I want to create fault tolerant SMB 3.0 share for my Hyper-v nodes, to make hyper-v FT cluster afterwards.
So, I see inr equirements that SAS disks will work, but during creating cluster, I can not manage Cluster to see disks from both servers (total 6 free units)
If it is made via ISCSi target, both servers have access to that targets and cluster sees all available through iSCSI disks, but how to mnake SAS disk available to other server?
Is it possible what I need with this configuration? is it a option to make each server iSCSI target and initiator? (but it would be way complicated and slow, I think).
so, what I have misunderstood, how to make FT file Cluster with 2 servers with SAS drives?
Any info about this SPECIFIC config would be welcomed, or any general step-by-step guides (please, do not link me guides with other config, like iscsi or with additional servers, I have seen a lot of them :()
thanks
You cannot do what you want with a Microsoft built-in tools. MSFT require you to take your SAS disks away from your servers, buy a SAS JBOD (better more then one to get advantage of a so-called "enclosure awareness" and avoid single point of failure) and
configure Clustered Storage Spaces with now *external* SAS drives. See:
How to Configure a Clustered Storage Space in Windows Server 2012
http://blogs.msdn.com/b/clustering/archive/2012/06/02/10314262.aspx
Prerequisites
A minimum of three physical drives, with at least 4 gigabytes (GB) capacity each, are required to create a storage
pool in a Failover Cluster.
The clustered storage pool MUST be comprised
of Serial Attached SCSI (SAS) connected physical disks. Layering any form of storage subsystem, whether an internal RAID card or an external RAID box, regardless of being directly connected or connected via a storage fabric, is not supported.
Windows Server 2012 R2 had flexed out some limitations so now ReFS is supported (but useless as VMs cannot be integrity checked and protected) and now you can use parirty spaces (also useless as they are DOG slow with a typical VM workload dominated by small
writes, say 4KB write initiates 256KB+ parity stripe read-modify-write update). Core requirements "SAS everywhere" is still there.
So if you don't want to mess with SAS JBODs you may give a try to a virtual SAN solutions available on the market. They can cluster a pair of hosts (even with a single port SATA drives) w/o any external hardware, only Ethernet required. There are even free
options available. See:
Free Virtual SAN
http://www.starwindsoftware.com/native-san-for-hyper-v-free-edition
Also Google (or Bing?) for DataCore and SteelEye as they have very similar native (Windows-based) offerings. + there's bunch of a VM-running storage doing more or less the same.
Hope this helped a bit :)
StarWind VSAN [Virtual SAN] clusters Hyper-V without SAS, Fibre Channel, SMB 3.0 or iSCSI, uses Ethernet to mirror internally mounted SATA disks between hosts.

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