Hardware : learn SCSI RAC @ Home

Hi Everyone,
First: I dont want to use vmware - i want to build a real hardware rac.
Second: I dont want to use Firewire - i want to build a rac with SCSI :o)
my problem is that i have no special cluster hardware knowledge.
i know i need a shared disk (scsi) and i need a second private network link for hearbeats.
the network link is no problem,
but im not sure what hardware for the shared disk i have to use.
my idea is:
PCI SCSI 160 (ie any Adaptec) Card with external Interface in every Computer and to use a external scsi disk as shared storage.
is this correct or are there special requirements on scsi controller and external scsi disk?
keep in mind: im a student with only a little money - therefore it has to be a cheap sollution.
Another topic is the software - i will try RAC on 10g R2 on Win2003 or Suse Linux Enterprise Server 9 - any special hints?
Thanks for any Help
Greetings from Hamburg
Andreas

Nothing new under the SUN here.
What you will require is two SCSI HBA's that should be a differential SCSI these days everything is practically LVD (Low Voltage Differential). Be sure you don't use a RAID controller because if you do you need to find out if they are so called "cluster" aware. You don't need nor want hardware RAID in this situation, let Oracle take care of that.
You do need to set the scsi-id on the scsi adapters differently from each other. Default they are on scsi ID 7. Then all you need is a simple casing for an external harddrive (or more expensive for external harddrives) and you are off. You can also use some elbow grease and don't bother about the harddisk enclosure and just wire up an extra powersupply for your external drives (externally of course) and connect those to your drive(s) and run an internal standard scsi cable between them. I do agree that that's really dodgy but for an @home solution a great deal of fun.
I run Oracle on two SUN 420R's with two D1000 SCSI enclosures between them and it's just great works really well for home experiment.
But if you want production ready environment than the idea of shared SCSI is not the way to go, in that case let your boss dig in his pockets for a change and let him flick out 20g and you have a very nice SAN based storage solution filled with FC-SAS disks and if he's willing to be more he can have FC-disks.

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