1) AWS is planning to support 16TB EBS. Can the current Cloud ONTAP support it?
2) If 1) is yes, I want to know aggregate and volume's limitations. Aggregate - Max per instance - Max size - Min number of disks - Max number of disks - Max number of disks across all aggregates FlexVol - Max size
The upcoming release of Cloud Manager and Cloud ONTAP will take advantage of the larger EBS GP2 sizes, in addition to offering the option to use EBS Magnetic volumes with a Cloud ONTAP system, as well as several additional features and enhancments.
While the EBS GP2 maximum voume size has increased to 16TB, the maximum disk size Cloud ONTAP will use is currently 8TB. With the maximum number of 'disks' that can be attached to a Cloud ONTAP system that will put the maximum capcity around 350TB per Cloud ONTAP instance.
The maximum size for a EBS Magnetic voume has stayed at 1TB. With the maximum number of disks that can be attached to a Cloud ONTAP sytem, that will put the maximum Magnetic disk capcity around 45TB per Cloud ONTAP instance.
The upcoming release of Cloud Manager and Cloud ONTAP will be available very soon.
The maximum number of 'disks' per cloud ONTAP aggregate has not changed from 6. There are several factors that go into that number, but mainly it's because AWS doesn't recommend any more than 6 'disks' (EBS Volumes) to be used in a RAID 0 configuration.
So, to address your questions for the upcoming release of Cloud Manager and Cloud ONTAP:
Aggregate Size: 6 disks max (both GP2 and Magnetic)
- GP2: 6 x 8TB = 48TB RAW
- Mag: 6 x 1TB = 6TB RAW
Max Flexible volume size based on Max aggregate size:
- GP2: ~ 42 TB usable per aggregate
- Mag: ~ 5.2 TB usable per aggregate
The Flexvol capacities are aproximations, but also based on what I've seen. I believe the overheads you used in your calculations were a bit too high.