Can I create raid 5 staring with 2hdd?

[hlhp_verehan]

From my understating, raid 5 allow 1 hdd failure.

If I have an old 8TB hdd, I want to increase volume without erase the data.

Can I get another 2 new 8TB hdd, then create raid 5 with 2 new hdd, than copy the data from my old hdd, finally erase the old hdd and add the old hdd to the raid 5?

[Arch Stanton]

Nope...

[einstein9]

From my understating, raid 5 allow 1 hdd failure.

If I have an old 8TB hdd, I want to increase volume without erase the data.

Can I get another 2 new 8TB hdd, then create raid 5 with 2 new hdd, than copy the data from my old hdd, finally erase the old hdd and add the old hdd to the raid 5?

Minimum 3 drives to create RAID5
but you can do RAID1 mirror with 2 drives

[fzabkar]

Create a virtual RAID 5 in DMDE using 2 physical drives and a NULL disk. Copy Sectors from the old 8TB drive to the virtual RAID. Then you will have a degraded RAID. I'm not sure how you would proceed from here, though.

[hlhp_verehan]

Thank you for the replies.
I am running out of space, so RAID1 is not my option.
After checking DMDE, it is a bit complicated, I afraid I messy up my data.
I think I just using Symbolic link to workaround for now.

[alpy]

The same thing mentioned by @fzabkar can be done using mdadm under linux, if you are OK with software raid. But that will be way more complicated.