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Need to move 3 semi-large (millions of rows) related tables with clustered indexes to a new filegroup on the SAN. Is there a way to estimate how long dropping / recreating clustered index will take? Is there a way to monitor the percentage complete / time remaining for creating the clustered index? Need to tell management what approximate downtime to expect.

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    take the size of the table (because clustered indexes are the table) and then calculate source read speed vs target write speed. Add a fudge factor of 2x and then some more if it's going to be during a maintenance window or during business hours. – Jonathan Fite Apr 15 at 15:55
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    Also consider just adding files to the existing filegroup. Placing objects on different filegroups often not a good idea. – David Browne - Microsoft Apr 15 at 17:29
  • why do you say that, @DavidBrowne-Microsoft? What troubles could come from placing objects on different filegroups? – Ronaldo Apr 15 at 18:05
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    Uneven IO utilization is the biggest downside of manually allocating object to filegroups. – David Browne - Microsoft Apr 15 at 18:22

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