Follow-up to wearing / caching question

[Jörn Engel]

On Tue, 8 February 2005 13:22:23 +1300, Charles Manning wrote:
> 
> 20 year product life? Really? What stuff are you still using that was first 
> plugged in in 1985?

Most likely some old mainframes.  But even for them it'd be a long
life.

> There are two factors which skew this:
> 
> 1) Garbage collection. Depending on the way the files are rewritten and freed 
> up, different amounts of garbage collection rewrites will be performed. Worst 
> case GC can drive up the number of writes.
> 
> 2) "Squatter files". Some files live a long time and some are transient. 
> Those that live a long time will tend to take up "squatters rights" on an 
> area of flash which means that the rest gets written more often.

I guess dwmw2's approach to split up writes between two erase blocks
would solve both issues.  GC'd data can be expected to be rather
long-living, so it goes to a different block than newly written data.

Jörn

-- 
People will accept your ideas much more readily if you tell them
that Benjamin Franklin said it first.
-- unknown