for example https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-scrub On May 12, 2016 3:13:22 AM GMT+08:00, Eric Wheeler <bcache@xxxxxxxxxxxxxxxxxx> wrote: >On Wed, 11 May 2016, ching lu wrote: > >> 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? > >What do you mean by scrub? > >-- >Eric Wheeler > >> >> >> 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 >> -- 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
