Hi Florian,
On 10/25/2013 11:44 AM, Florian Weimer wrote:
On 10/15/2013 09:13 PM, Rolf Fokkens wrote:
On 10/14/2013 10:08 AM, Florian Weimer wrote:
Is there a write-up somewhere documenting what strategies are
implemented by bcache to keep the SSD and the hard disk contents in
sync even in the event of a sudden power loss?
This is good place to start: http://bcache.evilpiepirate.org/
It doesn't actually address this as far as I can see. It only
describes how the data structure integrity is maintained on the SSD
side. Even that doesn't seem to address torn writes (which are
problem for cheap-to-medium-grade SSDs). The code contains "propagate
barriers" as a to-do item (see the beginning of
drivers/md/bcache/btree.c). I couldn't find anything that discusses
write ordering issues which can occur in write-through mode.
I don't have the expertise myself to answer your question, so I hereby
forward this question to Kent and Gabriel and the bcache mail list.
Rolf
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