Victor,  DMS rolls back so that spares aren't moving around to different physical locations in the array over time... this ensures that the spare coverage you have upon initial installation of the array remains the same throughout the lifespan of the array.  Thanks,  - Sean
Hi,  I have a query on VMAX drive sparing. Is permanent drive sparing gone now and Direct Member Sparing with rollback only as of 5876 Q4 2012 SR? If so is this true for all VMAX models? Does this not have an impact on performance if there are two rebuilds?  I looked at this paper and the permanet sparing is still present?  [URL]  I may have got my wires crossed.  Thanks for your help   Victor
Drive Sparing