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EMC Symmetrix DMX-3 Product Guide
Data Integrity, Availability, and Protection
excessive and that a hard failure is probable, it looks for an available
spare in its pool of spares.
The Symmetrix system dynamically copies all data from the device
containing the failing volume to the available spare. The Symmetrix
system continues to process host I/O requests at the highest priority
while this copy operation takes place to minimize the effect on
performance. When the copy operation completes, the Symmetrix
system notifies the EMC Customer Support Center of the event. The
spare and the original device work as a mirrored pair until the
defective unit is replaced.
After the disk is replaced, the EMC Customer Engineer (CE) then
issues commands for the Symmetrix system to dynamically copy the
contents of the spare to the new device. The spare remains in use
until the copy completes. When the copy has completed, the CE
issues commands for the Symmetrix system to return the spare to its
pool, making it available should another volume fail in the future.
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