On 02/03/13 14:19, James Harper wrote:
I've read that SSD drives work best when you only use some percentage of them
(75%, 50%, etc) because by leaving unused space it allows the SSD more headroom
to shuffle data around internally to keep things optimal. Those articles are
most likely written for a filesystem on an OS that might not know about
TRIM/UNMAP etc.
Has anyone done any testing on sustained random write throughput on a (say)
60GB flash drive with only 50% dedicated to bcache, or 75%, or 100%?
SSD's use spare space to shuffle things around so they can reclaim space
freed in sizes less than a full erase block. Bcache explicitly uses big
buckets in such a way as to remove the requirement for this. Nothing is
freed in a way that would cause fragmentation of the sector space, so no
re-organising is required on the part of the drive.
--
To unsubscribe from this list: send the line "unsubscribe linux-bcache" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
