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Hi
I found this interesting
At spictera we have a solution that can take snapshots using any type of hardware, storing the snapshots on ibm spectrum protect
the technique uses LVM to take the operating system snapshot, sending the block changes since last backup to the spectrum protect backup server
restoration is almost instant as the snapshot are provisioned vis spectrum protect client api and presented as a local hard disk on the server, containing snapshot data which then can be associated with a new or existing LV volume on the same or new server
The reverting to previous snapshot can be started as a background process (see lvconvert —merge -b), while the data is operational
we call this solution spictera brick
https://www-50.ibm.com/partnerworld/gsd/solutiondetails.do?&solution=56927&lc=en
if one wants to mount a volume as read only, than it is as simple as mounting a filesystem
# mountsnap -s /dev/mapper/vg-lv -t 2022-02-01.21:00:00 -m /mnt
# umountsnap /mnt