On 07/15/2013 09:25 PM, Conrad Meyer wrote:
By default, bcache runs a write-through cache -- it only
caches clean data. If the caching SSD dies, the bcache layer
can just forward requests to spinning drive. No data is lost.
(Bcache has a writeback mode where data loss is possible. I
do not recommend this mode.)
What's the benefit of bcache, compared to just sticking more RAM in the
machine? That you can get more cache, especially on systems that are
short on memory sockets? Or that the cache persits across reboots
(something that can be tricky because it requires synchronizing writes
to the cache and the disk)?
--
Florian Weimer / Red Hat Product Security Team
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