2018-01-08 02:37 PM
we just bought a FAS 2520 with 12 x 4TB setup.
Vendor suggested we downgraded to 7-mode to better utilize the disk space, so right now we have an aggregate with 19TB and another with 3TB.
NetApp Field technician was here to do a motherboard replace and strongly recommend us to go back to cluster mode, because he told me we can utilize ADP and have smaller root aggregate and claim back those disk space.
My question is, what would be the best way to go? Should we go back to Cluster mode? there's no data on the netapp, now is the best time to make the change if we want to.
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2018-01-08 06:35 PM
Go to cluster mode. We have recently released ONTAP 8.2.5 for 7-Mode, and have no plans for future releases of 7-Mode ONTAP after that. With ADP you do not have to dedicate disks to boot the second controller, so you get better usable capacity. The partner who recommended you go 7 Mode for capacity needs to take better advantage of the training and tools we have available. This is from a modelling tool that we have available to partners -
7DOT - N1 = 8 drives (2 parity) = 19TB usable, 1 spare
7DOT - N2 = 3 drives (2 parity) = 3TB usable, 0 spares
7DOT total = 22TB usable
CDOT - N1 root ADP (3 slices) = 387GB
CDOT - N2 root ADP (3 slices) = 387GB
CDOT - N1 data aggr (11 data slices) = 28TB usable
Hope this helps!
2018-01-09 09:30 AM
Thank you so much for the reply!
Yes, I did some research and it's good to get another confirmation from you.
My further question would be.
1) I think with this setup, it'd be active/passive with 2 controller, would there be a huge impact to performance?
2) When the time comes that we add more shelves to the unit, do we need to do a major overhaul to change it back to active/active?
2018-01-09 06:25 PM
Glad to help!