The read cache prevent the program to scrub the backing device directly. if a few bits flipped in the backing device, the cache may still return healthy data for a while. Must i remove cache device before scrubbing? On Wed, May 11, 2016 at 9:15 AM, Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx> wrote: > On Fri, 29 Apr 2016, ching lu wrote: > >> Hello, >> >> i want to develop a script to perform data scrubbing periodically. > > I think you want to set dirty_percent to 0 and cache_mode=writethrough. > Then wait a long time for dirty_percent to actually reach 0. > > -- > Eric Wheeler > > >> >> For my use case, i think it is meaningless to scrub cached data. >> >> If i change the cache mode to "none", will it turn off the read cache too? >> >> Furthermore, will this invalidate cached data? (i do not want to "warm >> up" the cache again after the scrubbing) >> >> Thanks in advance, >> c >> -- >> 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 >> -- 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
