Hi Zdenek, What do you mean "it's origin is already gone"? It is a snapshot of centos/root, which still is there. (I have since modified centos/root) So the origin is still there. I think it's because I merged the copy of the snapshot. If I merge the original snapshot, the copy remains and it's origin changes. That seems to work. * make snapshot fresh1 * change contents of root * copy fresh1 to fresh2 * merge fresh1 * reboot * root is now restored to how it was originally * fresh 2 now has origin root That works. (Although I get a daunting error message every time I create a snapshot, and sometimes I get error messages on merge, but it works most of the time.) Regards, Matt ________________________________________ From: Zdenek Kabelac <zkabelac@xxxxxxxxxx> Sent: Thursday, 17 January 2019 12:55:59 AM To: Davis, Matthew; LVM general discussion and development Subject: Re: how to copy a snapshot, or restore snapshot without deleting it Dne 16. 01. 19 v 0:03 Davis, Matthew napsal(a): > Hi Zdenek, > > Here's what I see with `sudo lvs -a`. (My snapshots are actually called `fresh` and `fresh2` not `mySnap`) > > ``` > LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert > fresh centos Vwi---tz-k <1.46t pool00 > fresh2 centos Vwi---tz-k <1.46t pool00 fresh So these both LVs are snapshots (since they were created with s(k)ipped activation - however 'fresh' LV cannot be merged anymore as it's origin is already gone. But 'lvconvert --merge centos/fresh2' should work - yet you need to manually drop 'k' flag (via lvchange). So to have 'working' merge - you have to see something in the 'Origin' field. If the Origin field is already 'empty' you can't be merging such LV even when it was originally created as 'snapshot'. Also note that thin snapshot merging is nothing else then a bit more 'smart' rename. Zdenek _______________________________________________ linux-lvm mailing list linux-lvm@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
