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E3 what generation...?
M.2 PCIe also does not do any RAID unless you have Intel RST on a brand new board. M.2 SATA RAID is rare onboard.
That depends on your budget, but this would be a question for your system integrator or distributor.
As William said, this would need to be a brand new board.
v5 or v6
You can get PCI adapters that would fit a 1U if you don't use a bracket.
No problem. Raid 0 an 1 can be done almost for free (~ insignificant proc. load) in software. Hardware raid nowadays makes sense only above/beyond raid 0 and 1 (i.e. raid 5[0] or 6[0]).
It might be useful, though, for OP to specify his question somewhat more.
Sure (and i would not use HW RAID1/0 anymore either, for anything), but i doubt he would have requested specifically RAID1 then as it is clear SW RAID works on any disks attached.
Viable solution indeed - I have this one; it uses a Marvell PCIe 2.0 x2 (so ~10Gbit/s, thus only a RAID1 makes sense to get full SSD speed) chip and has 2 M.2 B+M key slots and 2 SATA connectors.
Costs somewhere around 60EUR w/o VAT on Amazon from a French company, Kalea Informatique (ships by Prime via Amazon in EU)
Any providers offering dedi out of Supermicro MicroClouds E3 v5/6 should be able to do it. Convert both M.2 NVMe to U.2 2.5" and do SoftRAID 1.
https://www.supermicro.com/products/nfo/NVMe.cfm?show=SELECT&type=2#count
There is also a M.2 to PCIe Card adapter by SuperMicro that takes 2x M.2 NVMe drives.
http://www.supermicro.com/products/accessories/addon/AOC-SLG3-2M2.cfm
@William, just curious, does the Marvell card support M.2 NVMe Drives or normal M.2 SSD drives?
It cannot support NVMe - NVMe (and PCIe AHCI) SSDs are M-Key (PCIe x4), not B-M-Key (SATA). Consequently the Marvell chip only does SATA.
Splitting PCIe lanes - either from x4 slot to multi x4 shared or from x8/x16 to multi x4 dedicated - requires a PCIe switch (eg. PLX) which comes at a high price.
Amfeltec produces cards for this:
http://amfeltec.com/squid-pci-express-carrier-boards-for-m-2-ssd-modules/?view=list
They start - without SSDs - at ~350$.