On Wed, Feb 26, 2020 at 11:01:26AM +0100, Zdenek Kabelac wrote: > If you are aspiring of creating tens of snapshot per second - you probably > have very unusual workflow/requirement and mostly likely lvm2 is not the > right > tool for such task ATM. > [...] > So my advice - if you really need to use and create old snaps in very fast > way > is to developed your very own tool working in you restricted environment > where > you might probably not care about meta/data consistencies, deal with speed > of > udev and gazillion other issues - you can run your small 'ioctl()' stream > much > more efficiently.
For this workflow, it seems that using qemu-img in conjunction with qemu-nbd might be a good option. In this case, you build your reference image in a qcow image (as might be used for a VM). For a test, you then create a temporary image based on this reference image (using it as a backing file). Then you can mount this new image using qemu-nbd to get a block device for it, and mount the filesystem. After your test is done, you can unmount, delete the nbd mapping, and simply delete the temporary image you created. It should be quite fast and lightweight. You should even be able to run multiple tests in parallel. -- Douglas Paul _______________________________________________ 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/
