On 12/28/2016 03:14 PM, Raman Gupta wrote: > On 12/28/2016 04:24 PM, Rick Stevens wrote: >> On 12/28/2016 10:33 AM, Raman Gupta wrote: >>> I would like to change the cache mode of an existing lvm cache volume. >>> >>> I see the following in the man page: >>> >>> `With the --cachemode option, the cache mode can be set when creating >>> a cache LV, or changed on an existing cache LV.` >>> >>> However, it does not seem to work: >>> >>> # lvs -o cache_mode vg_raid10/lv_var >>> CacheMode >>> writethrough >>> # lvconvert --cachemode writeback vg_raid10/lv_var >>> # lvs -o cache_mode vg_raid10/lv_var >>> CacheMode >>> writethrough >>> >>> (Fedora 23, 4.8.14) >>> >>> The `lvconvert` command produces no output, and there is nothing in >>> dmesg or the journal. >> >> Have you tried adding the "-v" or "--verbose" flags to see if there >> is an issue? > > No change: > > # lvconvert --verbose --cachemode writeback vg_raid10/lv_var > # lvs -o cache_mode vg_raid10/lv_var > CacheMode > writethrough Looking at the man page for lvconvert (at least under F24 and F25), the "--type cache" flag is necessary to specify the "--cachemode writeback" option: # lvconvert --verbose --type cache --cachemode writeback vg_raid10/lv_var You might have to specify the cache pool stuff as well. Not sure. I've never done this. ---------------------------------------------------------------------- - Rick Stevens, Systems Engineer, AllDigital ricks@xxxxxxxxxxxxxx - - AIM/Skype: therps2 ICQ: 226437340 Yahoo: origrps2 - - - - "Hello. My PID is Inigo Montoya. You `kill -9'-ed my parent - - process. Prepare to vi." - ---------------------------------------------------------------------- _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
