Re: Raid inside SSDs ?
You could have raid built into the SSD, but how useful that is depends on what you are trying to protect again and what failures you are expecting. With SSDs I wouldn't expect that the failure is on the individual NVM chips but more likely to be the auxiliary components on the device - e.g. the external interface, diodes and resistors. Failure of these is likely to take out the entire device making useless the redundantly stored copies. Even with a good degree of separation most failures are caused by something, such as localized heating or power surges, within the same device there is a real chance the cause will damage both circuits at the same time.
Independent units are far more likely not to fail synchronously, and given that RAID1 halves your storage, you are going to need twice the number of devices anyway so you may as well keep the RAID between the disks instead.
Biting the hand that feeds IT
