Le 13/11/2013 19:23, Adam Berkan a écrit : > On Wed, Nov 13, 2013 at 6:13 AM, Matthew Patton <pattonme@xxxxxxxxx> wrote: >> On Wed, 13 Nov 2013 03:42:54 -0500, Francis Moreau <francis.moro@xxxxxxxxx> >> wrote: >> >>> First I'd like to know if over-provisioning is still needed when >>> bcache is used ? >> >> >> it's needed for any decent, sustained write load if you don't want >> performance to crash thru the floor. But it doesn't sound like this is your >> use case. Are you sustaining 5000+ write IOPs? >> >> >>> - Should I create 2 partitions with one left emtpy and whose size is >>> roughly 7% of the device size ? >> > bcache has a pretty flash friendly write pattern, so you probably > don't need a huge lot of empty space. The 7% might in fact be enough, > but bumping it up to 10%-12% wouldn't hurt. I think the >25% numbers > are more relevant for non-flash friendly writes (like random writes). > In that case you definitely want lots of free space. Thanks for your enlightment. I'll probably go for 10%. -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
