I'm migrating some LPARs on to a V7000 to a pool which has EasyTier enabled.
I've run some long running batch processes over a number days and the run times have reduced as expected as EasyTier has migrated the hot spots to my Solid State Drives (actually it's a LUN from Flash 820).
Next weekend we'll be going live and will be refreshing the entire LPAR from tape, a process which will take around 14 hours.
I'm concerned that the refresh will skew the EasyTier results causing my hot spots to be migrated back to SAS. Thiis would mean my first few batch runs will be slower until EasyTier has migrated the hot spots back to SSD/Flash.
1. Will the restore cause the currently migrated hot spots to be migrated back to SAS?
2. What would be the impact of me disabling EasyTier during the refresh process then enabling it again after the restores are complete? As long as the SSD?
3. Would EasyTier need to completely refresh its heat map if it was disabled and then enabled with a 24 hour period?