An 18-channel controller is very unusual, surely the first time I heard of it. I would ask if it's possibly a typo, but the enhanced performance of CM6 suggests it isn't. By the way, it is interesting that an overprovisioning of 167 GB per TB (i.e. 16.7%) allows the endurance to triple. So it's a simple trade-off between endurance and capacity. Since the overprovisioning is a constant percentage the 3 DWPD version of the 30.72 TB SSD will have a capacity of 25.6 TB (30.72 - 16.7% = 25.59).
Intel's first-generation NVMe controller (P3700, etc) was an 18-channel design. Their second generation (P4500, etc) dropped down to 12 channels. I think Samsung's using 16 channels for their PM17xx series. Microsemi's Flashtec controllers are mostly 16 channels. Client/Consumer SSD controllers top out at 8 channels, with SATA and low-end NVMe mostly moving to 4 channels these days.
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Santoval - Thursday, February 20, 2020 - link
An 18-channel controller is very unusual, surely the first time I heard of it. I would ask if it's possibly a typo, but the enhanced performance of CM6 suggests it isn't. By the way, it is interesting that an overprovisioning of 167 GB per TB (i.e. 16.7%) allows the endurance to triple.So it's a simple trade-off between endurance and capacity. Since the overprovisioning is a constant percentage the 3 DWPD version of the 30.72 TB SSD will have a capacity of 25.6 TB (30.72 - 16.7% = 25.59).
Billy Tallis - Thursday, February 20, 2020 - link
Intel's first-generation NVMe controller (P3700, etc) was an 18-channel design. Their second generation (P4500, etc) dropped down to 12 channels. I think Samsung's using 16 channels for their PM17xx series. Microsemi's Flashtec controllers are mostly 16 channels. Client/Consumer SSD controllers top out at 8 channels, with SATA and low-end NVMe mostly moving to 4 channels these days.MASSAMKULABOX - Thursday, February 20, 2020 - link
yes 18chls is unusual , but maybe thats 16+2 (2 extra for parity?) 5 power states ... enterprise class indeed.NV_Me - Thursday, February 20, 2020 - link
Do you happen to have the Power (W) specs for both Active / Idle states?