> Dne 8.7.2013 18:05, markw@mohawksoft.com napsal(a): >> I'm trying to get a snapshot of a snapshot. I know the new thin >> provisioning stuff supports this, but I'm not sure the release state is >> something I can use at a customer. >> >> Using LVM2, the snapshot format is tried and true, but inefficient if >> you >> want to take multiple snapshots. >> >> Looking at dmsetup, there doesn't seem like there would be an issue >> taking >> a snapshot of a snapshot, but it is disabled in the tools. >> >> I guess my question is this: Can it be done? Is there any reason why it >> should not work? >> > > 1. Noone has written support for it in lvm2. And AFAICK noone is working > on this. I thought I saw a patch for this in the 2010 time frame. > > 2. Since the activation order of old snapshot is not as simple as with > other > targets, it's currently not so easy to add support for into lvm deptree > resolver. In my case I would, more or less, be maintaining a lot of the interdependency information for the chain of shapshots and it would managed by a daemon being controlled by an application, not really subject to the whims of a sys admin. Is there a stable and supported way of getting this functionality? FYI: I'm trying to use RHEL as the basis for this and I think that's an old 2.6.x kernel. > > Zdenek > > > > _______________________________________________ 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/
