Hi, I have a question regarding how to ensure that all data is flushed to a logical volume before a snapshot is taken. The exact scenario is as follows: I have the logical volume "/dev/mapper/userfiles" which is formatted with Reiser3. The volume has been created using "dmsetup ... crypt ..." on top of a logical volume "/dev/storage/cryptdisk". My aim is to be able to write a set of files to the "/dev/mapper/userfiles" volume, then take a snapshot of the "/dev/storage/cryptdisk" as a backup, knowing that the contents of the backup are encrypted. I don't have a problem setting up the above scenario or creating the snapshot volume, but I want to be sure that the files I have written will be in the backup. My concern is that if all file writes have not been flushed through all the layers of LVM then I will not get all the files in the snapshot of then encrypted volume. I have tried issuing the "sync" command, but I am not confident that this has worked. Is it necessary to forcibly flush the data through each layer of the above volume "stack" so that I know it is all on the snapshot, or is this taken care of automatically when the snapshot command is issued and I am just being paranoid... Thanks, Roger. _______________________________________________ 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/
