shared-memory (also called Symmetric Multiprocessors SMP)
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all processors share direct access to a common global memory and to all disks. example: Oracle7 on SGI Challenge
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shared-disks
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each processor has a private memory but has direct access to all disk. example: Oracle 7 on IBM SP2
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shared-nothing
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each memory and disk is owned by some processor that acts as a server for that data. Mass storage is distributed among processors by connecting one or more disk to each processor. example: DB2 on SP2
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This is Òowner computeÓ rule as in much scientific computing (HPF default implies processor where variable ÒstoredÓ performs computations setting variableÕs value)
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