On Sun, Jul 8, 2012 at 2:42 AM, Kent Overstreet <koverstreet@xxxxxxxxxx> wrote: > On Wed, Jul 04, 2012 at 11:15:32AM +0200, Alain Spineux wrote: >> Hi >> >> I'm trying to unregister disks to unload the bcache module and reuse >> the disk for other tests. >> >> Can someone tell me how to unload module bcache after having run these command ? > > You'd use either unregister or stop (in the various bcache directories, > depending on whether you just wanted to stop/unregister a backing device > or cache set) and then you ought to be able to rmmod it. > > I should test that though, I wouldn't be surprised if something isn't > completely working. YES ! stop is working ! Thanks Kent Here is a kind of getting started first load the bcache module # modprobe bcache I created a cache device on /dev/sdb1 # ./make-bcache -C -b512k -w4k --writeback /dev/sdb1 # and a backing device on /dev/sdz1 ./make-bcache -B /dev/sdz1 # ./probe-bcache /dev/sdb1 5f42bdd1-4342-4ab6-8dda-855989a09604: UUID="" TYPE="bcache" # ./probe-bcache /dev/sdz1 6bbac9a4-afbd-4d40-9562-cdd290622c5d: UUID="" TYPE="bcache" I register the backed device # echo /dev/sdb1 >/sys/fs/bcache/register This create /dev/bcache0 thap map /dev/sdz1 except for the first blocks to avoid to use sdz1 instead of bcache0 ATTN bcache0 is not yet attached to any cache device ! I create a "cache set" # echo /dev/sdz1 >/sys/fs/bcache/register # ls /sys/fs/bcache/ 887d3bb6-0161-4e54-b9d8-801de9f7df83 register register_quiet "887d3bb6-0161-4e54-b9d8-801de9f7df83" is the uuid of the "cache set" composed by the caching device /dev/sdb1 now I attach /dev/sdz1 to this cache set # echo "887d3bb6-0161-4e54-b9d8-801de9f7df83" > /sys/block/sdz/sdz1/bcache/attach I want to activate writeback # echo writeback > /sys/block/bcache0/bcache/cache_mode and ask bcache to bypasse the cache when I write more than 64k of sequential data. Default is 4M # echo 64k > /sys/block/sdz/sdz1/bcache/sequential_cutoff to stop bcache0 # echo 1 > /sys/block/sdz/sdz1/bcache/stop to stop the cache set # echo 1 > /sys/fs/bcache/887d3bb6-0161-4e54-b9d8-801de9f7df83/stop An finally unload the module # modprobe -r bcache > >> >> Thanks. >> >> #first load module >> # modprobe bcache >> >> I created a cache device on /dev/sdb1 >> # ./make-bcache -C -b512k -w4k --writeback /dev/sdb1 >> >> and a backing device on /dev/sdz. >> # ./make-bcache -B /dev/sdz >> >> # ./probe-bcache /dev/sdb1 >> 5f42bdd1-4342-4ab6-8dda-855989a09604: UUID="" TYPE="bcache" >> >> # ./probe-bcache /dev/sdz >> 6bbac9a4-afbd-4d40-9562-cdd290622c5d: UUID="" TYPE="bcache" >> >> >> I then registered them by: >> # echo /dev/sdb1 >/sys/fs/bcache/register >> # echo /dev/sdz >/sys/fs/bcache/register >> >> I have /dev/bcache0. >> /dev/bcache0 maps /dev/sdz except the first blocks >> /dev/bcache0 is not yet cached by anything >> >> # ls /sys/fs/bcache/ >> 887d3bb6-0161-4e54-b9d8-801de9f7df83 register register_quiet >> >> "887d3bb6-0161-4e54-b9d8-801de9f7df83" >> is the id of the bcache "pool" composed by the only caching device /dev/sdb1 >> >> # now I attach /dev/sdz to this pool >> echo "887d3bb6-0161-4e54-b9d8-801de9f7df83" > /sys/block/sdz/bcache/attach >> >> >> >> -- >> Alain Spineux | aspineux gmail com >> Monitor your iT & Backups | http://www.magikmon.com >> Free Backup front-end | http://www.magikmon.com/mksbackup >> Your email 100% available | http://www.emailgency.com >> -- >> 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 -- Alain Spineux | aspineux gmail com Monitor your iT & Backups | http://www.magikmon.com Free Backup front-end | http://www.magikmon.com/mksbackup Your email 100% available | http://www.emailgency.com -- 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
