Does modern UBI/UBIFS still suffer from the 'unstable bits issue'?

[Richard Weinberger]

Tim,

Am Freitag, 2. März 2018, 17:20:57 CET schrieb Tim Harvey:
> > Just to be sure, this is SLC NAND, right?
> 
> No, its a MT29F16G08 16GB MLC

Sorry, MLC NAND is not supported by UBI and UBIFS [0].

The ECC errors you are facing are most likely caused by paired pages.
On MLC NAND, pages come in pairs. If a write operation is interrupted, not 
only the current page is corrupted like on SLC, also the already written 
paired page is lost too.
Boris Brezillon and I spent a lot of time in addressing this problem but came 
to no good solution after all.
Well, we had a solution but it needs a lot of testing and fine tuning, sadly 
we run out of budget.
Beside of that, read and write disturb are also an important factor, this can 
be addressed with the experimental ubihealthd.

Thanks,
//richard

[0] http://linux-mtd.infradead.org/doc/ubifs.html#L_ubifs_mlc