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Yes. That's another consensus of the block-level log-structured caching works that I've introduced in the previous post. For example, NetApp's Mercury (2012) has the following sentence indicating that it also copy data to in-memory buffer and write it (called log chunk in the paper but I call dm-writeboost's equivalent "RAM buffer") to cache device when it gets full. ``` Once a successful acknowledgment is received, an I/O command’s data is copied to an in-memory buffer, called a log chunk, and the command is completed to the upper layer. The log chunk is written to the cache device when full. ``` - Akira On 2015/02/21 0:06, Joe Thornber wrote:
On Fri, Feb 20, 2015 at 05:44:01PM +0900, Akira Hayakawa wrote:I will wait for ack from dm maintainers.Are you still copying the contents of every bio to your own memory buffer before writing it to disk? - Joe |
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