> On 5 Jan 2018, at 20.33, Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote: > > On 01/05/2018 05:16 AM, Matias Bjørling wrote: >> From: Javier González <javier@xxxxxxxxxxxx> >> >> Allow to set the over-provision percentage on target creation. In case >> that the value is not provided, fall back to the default value set by >> the target. >> >> In pblk, set the default OP to 11% of the total size of the device > >> +#define PBLK_DEFAULT_OP (11) > > Hi, > Just curious -- where does 11 come from? Is it a spec value? 11 stands for 11% over-provisioning for the media to allow garbage collection. Different SSDs have different values based on the targeted workload - 11% is a common default value for standard drives. The spec. does not specify any default values of over-provisioning. Javier.
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