A good rule of thumb for SAN migrations is that any data base exceeding 10TB should have its LUN layouts inspected prior to migration.
Sure new hardware has lots of performance gains but don't expect cache and to make up for lack of spindles.
If there is any existing waitio at the cpu level then resolve this prior to the migration or instead of treating the migration as a SAN migration treat it as a Database migration.....Create new server with new LUN, copy data over, validate performance and then rescheduled a live SAN update and cut over. This may take longer but its better than spending the weekend and nights on an high severity incident.
Regards.
Scott.
Sure new hardware has lots of performance gains but don't expect cache and to make up for lack of spindles.
If there is any existing waitio at the cpu level then resolve this prior to the migration or instead of treating the migration as a SAN migration treat it as a Database migration.....Create new server with new LUN, copy data over, validate performance and then rescheduled a live SAN update and cut over. This may take longer but its better than spending the weekend and nights on an high severity incident.
Regards.
Scott.
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