On 18/09/17 07:10, Dave wrote: > For my understanding, what are the restrictions on deleting snapshots? > > What scenarios can lead to "ERROR: parent determination failed"?
The man page for btrfs-send is reasonably clear on the requirements btrfs imposes. If you want to use incremental sends (i.e. the -c or -p options) then the specified snapshots must exist on both the source and destination. If you don't have a suitable existing snapshot then don't use -c or -p and just do a full send. > I use snap-sync to create and send snapshots. > > GitHub - wesbarnett/snap-sync: Use snapper snapshots to backup to external > drive > https://github.com/wesbarnett/snap-sync I am not familiar with this tool. Your question should be sent to the author of the tool, if that is what is deciding what -p and -c options are being used. Personally I use and recommend btrbk. I have never had this issue and the configuration options let me limit the snapshots it saves on both the source and destination disks separately (so I keep fewer on the source than on the backup disk). Graham -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
