Francis Moreau wrote: > Hello Matthew, > > Le 13/11/2013 15:13, Matthew Patton a écrit : >> 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? >> > > That's indeed not really required: my system is for a desktop usage. > >>> - Should I create 2 partitions with one left emtpy and whose size is >>> roughly 7% of the device size ? >> >> Your SSD already has 7% overprovisioning. For best sustained and >> consistent write performance you'll want to bump it to 25-30%. Yes you >> just need to partition/LVM down to the desired size. > > Hmm, I don't see what makes you think that my SSD has already 7% > overprovisioning ? Actually I don't think it's the case. > > Thanks for your help. Because the raw flash chips are only available in power-of-two sizes. The available storage the controller allows access to is 120GB, and it's reserved 8GB for overprovisioning if I'm looking at the right model. -- 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
