Effect of partitioning on wear-leveling

[Russell Haley]

How long can nand go without power before it starts to lose data integrity?

Thanks,
Russ

On Mon, Mar 21, 2016 at 8:48 PM, Warner Losh <imp at bsdimp.com> wrote:
>
>> On Mar 21, 2016, at 9:34 PM, bob prohaska <fbsd at www.zefox.net> wrote:
>>
>> On Mon, Mar 21, 2016 at 08:38:13PM -0600, Warner Losh wrote:
>>>
>>> One thing that people forget is that the underlying blocks that are written
>>> are completely independent of what lba is used to write it. So the notion
>>> that you have blocks normally part of /var or /tmp no longer makes sense.
>>> Between writing blocks in different order and garbage collection, modern SD
>>> cards do a good job of wear averaging. How much you've written to the drive
>>> in total drives wear out these days.
>>>
>>
>> How do modern flash devices report end of life? Do problems show up in error
>> logs, or does the device simply refuse to work with no warning?
>
> Undefined. Either it goes read-only or read-never. :)
>
> Warner
>