What is the relationship between the storage subsystem and application OS in a SAN? I always see that the subsystem vendor claims that its product only works for certain type of OS! However, from the hardware approach, all are connected by FC. It seems that as long as the drivers go right everything should be fine. Then, what makes the difference?

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The reason for certifying the OS is due to the differences in I/O instructions and error handling as implemented in various operating systems. SCSI is a standard, but with many interpretations -- especially where error handling is concerned. If errors are not handled properly between storage and systems, the system could fail and data become corrupted.

Therefore, all operating systems should be explicitly tested by subsystem vendors.

Regards,
Marc

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This was first published in May 2003

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