On Mon, 13 Jun 2016, Daniel Curran-Dickinson wrote:
On Mon, 2016-06-13 at 22:10 +0200, Etienne Champetier wrote:
Before we try to minimize writes, how much writes are we talking about?
my openwrt routers have multiple months of uptime, and even if we get
down to 1 week, that gets us to 53 writes a year.
How much writes can a flash handle these days?
I'm told that even cheap wear-levelling and flash chips from 4-5 years
ago with even 4 MB flash that it's really non-issue (and done the math
for what would be the case if wear levelling worked as claimed, on all
blocks, not just currently unwritten; the real question is whether
wear-levelling works as claimed, or more to the point whether there is
any *hard data* that says wear levelling does *not* work as claimed, or
whether persistent anecdotal stories of worn out flash are based on
urban legends, or classic mis-attribution).
Well, we don't have a layer that will implement wear leveling in OpenWRT/LEDE do
we? We use the raw flash and the filesystem, so unless the filesystem is moving
directories they will be hot spots.
But even in that case, aren't we talking hundreds of thousands to millions of
writes before there is a problem?
David Lang
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