On 27/05/19 05:05, Guoqing Jiang wrote: > +This variable sets a limit on the number of concurrent background writes, > +the valid values are 0 to 256, 0 means that write-behind is not allowed, > +while any other number means it can happen. If there are more write requests > +than the number, new writes will by synchronous. Is this a byte-wide or an integer field? 0 to 256 is an odd number - surely it should be 255 (0xff)? Cheers, Wol