topic Re: FAS2720 maximum uesd capacity in ONTAP Discussions

FAS2720 maximum uesd capacity

George_An — Wed, 04 Jun 2025 09:45:32 GMT

Dear all

we have to install a new system FAS2720 with 12x 16TB NL-SAS with 2 controllers. Which is maximum used capacity that i can take from this configuration?

Thanks

George

Re: FAS2720 maximum uesd capacity

John_Kolacz — Wed, 06 Sep 2023 12:34:52 GMT

16TB NL-SAS only supports RAID TEC and you'll need to use Advanced Data Partitioning (ADP) which will take a slice from each disk, so your maximum capacity will be roughly 9x16 or fairly close to 140TB.

Make sure you're using ADP. If you don't you'll lose about half your capacity. (it should be standard but we recently had a system shipped with a firmware issue that resulted in the system installing a separate root aggregate which caused us to rebuild from scratch.)

John Kolacz
Lead Systems Architect

Martin Marietta
4123 Parklake Avenue Raleigh, NC 27612

cell (919) 909-8348

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Re: FAS2720 maximum uesd capacity

George_An — Wed, 06 Sep 2023 12:54:10 GMT

Hi John

thanks for your reply, the disks are shared between the 2 controllers and I can't use the RAID TEC because we must use min of 7 disks and in my case i have 6 disks per controller

Re: FAS2720 maximum uesd capacity

CHRISMAKI — Wed, 06 Sep 2023 18:56:21 GMT

To get the most out of this, you'll use the layout recommended by Fusion, which unless you're a partner you won't have access to. But give all the non-root drives to one node.

Re: FAS2720 maximum uesd capacity

Aadhikara — Sat, 16 Sep 2023 10:30:52 GMT

Yes, you can use RAID-DP instead of RAID-TEC.