Hi, 2014-10-06 9:39 GMT+02:00 Zdenek Kabelac <zkabelac@xxxxxxxxxx>: > Dne 6.10.2014 v 09:28 Patrik Horník napsal(a): > >> Hi, >> >> is it possible to (safely) reduce size of thin metadata and / or thin >> spare metadata? What size of spare metadata is needed? Can it be >> smaller than size of pool metadata? >> > > You could remove pool spare volume anytime - lvremove. > (it's only used for automated lvconvert --repair) > > Repair needs free space in VG - if there is no free space - well tool can't > be used. when does automated lvconvert --repair kick in? Can I do it manually if it cannot continue automatically? (I actually have space for spare metadata so I want it there if it useful but smaller. I only need to decrease size of my volume group by couple of 100s MB because of moving to new device. My spare is 8 GB as is regular metadata.) > You could also reduce size of thin pool metadata in case it's too big, just > not online. > > > With offline thinpool with these manual steps > (will be later automated with tool as well): > > -- > > make a temporary LV of any size. > swap this temp LV with pool metadata > > # lvconvert --thinpool vg/mypool --poolmetadata mytemplv > Does not lvconvert only change metadata volume not copying data to it? So isn't there missing step to copy metadata from current metadata to mytemplv? Why do u use mytemplv anyway and dont copy metadata directly from current metadata to new smaller LV? Anyway I prefer to reduce spare metadata if possible and not risk reducing real metadata, it should be enough for me. Thanks. Patrik > Create your volume for metadata with new reduced size > (unsure which size is your target - but some calcs based on estimated usage > are necessary) > > Activate mytemplv which has now real metadata from thinpool. > > # thin_repair -i /dev/vg/mytemplv -o /dev/vg/mynewsizemeta > > # thin_check /dev/vg/mynewsizemeta > > > If all is green - swap new meta into your thinpool > > # lvconvert --thinpool vg/mypool --poolmetadata mynewsizemeta > > > If all works great you are done :) > In all other cases you have your backup at hand :) > > Yeah - you still have old metadata in mytemplv - this volume you may remove > later if all works well - otherwise you may try to swap this volume back. > > Zdenek > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
