Same thing happens to the ACPI command set in RAID. It’s hard to pass commands through to individual nodes in a logical disk when the command sets (NVMe included) are built around logical disks. NVMe RAID is no different...you loose a lot of power saving features when running them in RAID, at least in the LSi controllers I’ve dealt with that effectively multiplex the drives together, leaving them up to their own firmware when it comes to management.
NVME RAID only makes sense in terms of redundancy. It is entirely unnecessary for performance, as it doesn't improve the weak spot of nand flash - random performance, and only adds sequential performance, which isn't really needed, as big as the numbers can get, they make no difference to overall performance.
Additionally, NVME storage is very expensive even compared to SATA SSDs, and even more so compared to HDDs.
Newer controllers are welcome, as they can incorporate newer chips and utilize newer interfaces, for example a lot of the controllers out there are still only pcie 2 compliant. And pcie 4 is just around the corner. Newer chips have better performance and better power efficiency, on top of possible new features.
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remosito - Wednesday, November 1, 2017 - link
Not sure the world needs more SAS/SATA RAID controllers. What is sorely needed though are nvme RAID controllers. ESXi certified while we are at it.lefty2 - Wednesday, November 1, 2017 - link
The world will always need spinning disks to provide cheap storage.But these are really for storage servers.
remosito - Wednesday, November 1, 2017 - link
My comment ain't really about HDD vs SSD actually. Plenty of SAS and SATA SSDs. And plenty of RAID controllers for those.Kraszmyl - Wednesday, November 1, 2017 - link
Lsi/Broadcom support nvme drives.Billy Tallis - Wednesday, November 1, 2017 - link
They support a weird passthrough mode of NVMe commands, but it's not really hardware RAID.Samus - Wednesday, November 1, 2017 - link
Same thing happens to the ACPI command set in RAID. It’s hard to pass commands through to individual nodes in a logical disk when the command sets (NVMe included) are built around logical disks. NVMe RAID is no different...you loose a lot of power saving features when running them in RAID, at least in the LSi controllers I’ve dealt with that effectively multiplex the drives together, leaving them up to their own firmware when it comes to management.ddriver - Thursday, November 2, 2017 - link
NVME RAID only makes sense in terms of redundancy. It is entirely unnecessary for performance, as it doesn't improve the weak spot of nand flash - random performance, and only adds sequential performance, which isn't really needed, as big as the numbers can get, they make no difference to overall performance.Additionally, NVME storage is very expensive even compared to SATA SSDs, and even more so compared to HDDs.
Newer controllers are welcome, as they can incorporate newer chips and utilize newer interfaces, for example a lot of the controllers out there are still only pcie 2 compliant. And pcie 4 is just around the corner. Newer chips have better performance and better power efficiency, on top of possible new features.
MadHacker - Saturday, November 4, 2017 - link
I want a "Microsemi Adaptec SmartRAID 3154-24i"Any ideas on cost, and/or where to buy them? goggle hasn't been to helpful :(