On Fri, May 13 2016 at 6:39am -0400, Gionatan Danti <g.danti@assyoma.it> wrote: > Hi all, > using thin provisioning in production machines (using it mostly for > its fast snapshot support, rather than for thin provision / storage > overcommit by itself), I wonder what to do if a critical metadata > corruption, as the loss of the superblock, should happen. > > Filesystems generally have some backup copy of the superblock; > should the primary one fail, another copy can be used. > > So I have the following questions: > - how about thin LVM? Has it a backup superblock somewhere? > - how can the metadata be reliable backupped without shutting down > the volume? > - more generally, how to deal with metadata backup? Does > vgcfgrestore works for thin volumes? > > Thank you all. There is more to the thinp metadata than just the metadata superblock. The DM thin-pool's metadata device was purposely split out from the data device to allow for additional metadata fault protection using RAID. I'll defer to the LVM developers for if/how LVM can be used to have thinp metadata redundancy even if you don't have multiple devices to be able to use a conventional RAID device. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
