On Wed, 2011-02-23 at 12:36 +0000, Jonathan Tripathy wrote: > Hi Everyone, > > We host many Xen VMs for customers. We use LVM as the fisk storage for > these VMs. When a customer cancels, we generally dd their LV with > /dev/zero, before removing the LV. > > If however we want to create a snapshot of a customer's LV, is there the > chance that the data may appear on a new future LV if we were to create > one (for a new customer)? Is is my understanding that most filesystems > don't actually remove data from a disk when deleting a file, but just > set an "ignore" tag of some sort... I'm a bit confused about your scenario. But I think this will help: The snapshot device is composed of 2 sub devices, the origin and the exception store. Someone who only has visibility of the snapshot (ie. your vm if your scenario is what I think it is) will have visibility of all of the origin. So you _do_ need to worry about data leaks on the origin device. Their view of the exception store is always a subset which has been overwritten by origin data first. So data leaks are not an issue for the exception store. - Joe _______________________________________________ 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/
