On Jan 24, 2014, at 2:58 AM, Sergio Pascual <sergio.pasra@xxxxxxxxx> wrote:
I'm not so sure the plugin needs an update or replacing or a separate user space program that helps manage the moving parts: the snapshot creation, the update, altering fstab and grub.cfg as needed, and even what the bootable snapshot options should look like and where: we have three kernels to choose from in GRUB, as soon as there's one snapshot, we might have three identical kernel versions each with two sysroots; or possibly there are four kernels, one only boots the old sysroot, one only boots the new sysroot and two could boot either sysroot. And that's just with one snapshot, as soon as there are accumulating snapshots to boot, I start looking for blood because I don't have enough going to my brain as it is.
Right and there's a legitimate question how useful conventional LVM snapshots are, just because at one time they were the only thing we had, but they're slow and inefficient and you wouldn't want to use them for very long as that's not what they were designed for. Whereas LVM thinp snapshots are completely different, useable, accumulatble over the long haul, do not require preallocation, very much like Btrfs snapshots but of course a different implementation. And then Btrfs snapshots are dead nuts simple to create and remove compared to thinp - *and* they are directly grub2 bootable unlike LVM thinp.
Chris Murphy
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