Yes sparing will be taken into account for the new SSD's so you will lose some space dependent on the algorithm you've opted for, typically 1 or 2 largest disks in a tier. There's no problem mixing the drives in the same CPG, but obviously the 400GB drives will fill before the 920's, which means potentially not all data will come from all SSD drives. If you're using AO then some will come from all SSD's and some, above the 400GB drives capacity will come only from the 920GB's. Cage level availability will be enforced at the CPG, assuming Raid 5 3+1 then you need a minimum 8 disks to ensure your can sustain CLA beyond the capacity of the current 400GB drives. I'd probably look at the new eMLC 480GB's as there's less of a capacity jump and you can add more for the money. Which spreads things wider and provides a better balance, but the 920's are still a valid option.
Last edited by Cleanur on Wed Feb 19, 2014 3:04 pm, edited 2 times in total.
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