Increase Storage capacity on data domain DD4200 & DD890

Be wary when talking about specific models and the amount of shelves (number of) vs RAW or useable storage figures.

You really should engage your SE to calculate this for you where possible.

The DD890 can be complex, SAS cables (length and type) are important when you order new ES30 shelves if you have ES20's - here is why;

DD890 = 384TB RAW or 12 shelves (whichever you reach sooner).

That figure is calculated based on 12x ES20 shelves with 2TB disks - which are therefore 32TB RAW each from 16 slots).

ES30 shelves with 2TB have 15 slots so are 30TB RAW. So 12 shelves is still the max with 12x 30TB ES30’s.

If you have ES20's in your system now, you cannot share ES20's and ES30's on the same set (loop) - EMC made a bypass rule for the DD890 to allow you to add up to 16 shelves to accommodate an awkward issue where you have ES20's essentially "ransoming" a loop/set of shelves. But you still can't exceed 384TB (RAW).

It's that mixture of ES20's and ES30's that cause complexity.

DD4200.

Assuming your system was not a headswap controller upgrade from an older system that had ES20’s.

Also, that it is not an extended retention system (formerly called DD Archiver).

 

The max is 8 shelves of ES30’s (2TB disks – 30TB RAW) OR 240TB RAW – whichever you reach sooner – 45TB shelves (15x3TB) will reduce your possible shelf count max to below 8.

DD4200 uses SAS disks in ES30 shelves and are not compatible with DD890, you cannot add SATA ES30's to the DD4200 either, only a headswap upgrade will allow a DD4200 to host ES20 or SATA ES30 shelves as part of the upgrade.

Hope that helps.

  

Regards,

Jonathan