Re: how to convert a disk containing a snapshot to a snapshot lv?
Tomas Dalebjörk <[email protected]>
| Newsgroups | gmane.linux.lvm.general |
|---|---|
| Message-ID | <[email protected]> |
Hi Yes, it is an incremental backup based of the cow device no worries about the backup, that works fine, and now by just creating a lv snapshot on it, works too sent you an example before eg # extend vg with new bu disk vgextend xxx newdisk # create lv structure on disk lvcreate -s -L wholedisksize -n s1 xxx/lv newdisk # merge has to be started offline? lvchange -a n xxx/lv # start merge lvconvert -merge -b xxx/s1 # online the lv lvchange -a y xxx/s1 The backup is provisioned through the disk, and makes the data available immediately But, I guess I can skip some steps? Restoring data in just a matter of minutes, regardless of size, or will say, making the data available anywhere in just a few minutes, regardless of size Also working with writes, without destroying the backup are there a way to get a signal when a merge has completed? or do I have to implement a monitor dmsetup xxx or lvs to check when merge has completed Reference Tomas Sent from my iPhone > On 28 Dec 2021, at 06:32, Stuart D Gathman <[email protected]> wrote: > > >> >> If you want to give it a try, just create a snapshot on a specific device >> And change all the blocks on the origin, there you are, you now have a cow >> device containing all data needed. >> How to move this snapshot device to another server, reattach it to an empty >> lv volume as a snapshot. >> lvconvert -s, command requires an argument of an existing snapshot volume >> name. >> But there is no snapshot on the new server, so it can't re-attach the >> volume. >> So what procedures should be invoked to create just the detached references >> in LVM, so that the lvconver -s command can work? > > Just copy the snapshot to another server, by whatever method you would > use to copy the COW and Data volumes (I prefer partclone for supported > filesystems). No need for lvconvert. You are trying WAY WAY too hard. > Are you by any chance trying to create an incremental backup system > based on lvm snapshot COW? If so, say so. > > _______________________________________________ > linux-lvm mailing list > [email protected] > https://listman.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > _______________________________________________ linux-lvm mailing list [email protected] https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/