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February 26, 2008

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Anand Vidwansa

Hi Steve,

Thats a great insight into Clariion's RAID5 details. Could you explain what happens when Clariion encounters a read or write error? Does it start an implicit RAID rebuild or the administrator is expected to do it? And what happens to the application that issued IO to the LUN? What error status is returned to the application which encounters the I/O error?

Anand

Steve Todd

Hi Anand,

Good question. On a solitary read error, yes the rebuild is implicit. The administrator doesn't have to do an explicit rebuild. For one write failure CLARiiON will also do everything implicitly.

From the application point of view, the RAID5 algorithms return good status. The I/O error observed at the disk drive level does not get reported to the application.

Steve

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by Steve Todd

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