On Mon, Apr 1, 2019 at 5:11 PM Bryan Smith <[email protected]> wrote:
> There are various Device Mapper solutions out there, expanding more every > day in the Upstream. As those solutions mature, they can be added. > Examples, for starters? > > - Stratis, which is an Upstream project built around largely DM that adds > what a lot of Red Hat installations have long asked for - - the ability to > better 'manage' storage. This may catch on with many distributions over > time (it's in RHEL8, still trying to get it back ported to RHEL7). > > - LVM-integrated Raid - - not the old 'dm-raid,' but the newer, but > little known, Device Mapper RAID that actually uses the Multi Disk (MD) > subsystem to manage the blocks, but the meta-data/"container" is in > DM-LVM2. It solves the long-standing, old problem with old 'dm-raid' > (which some distros still use for firmware/fake RAID - - yikes!) that > cannot rebuild, whereas MD can. > > Understanding kernel Device Mapper is really what both LVM and MPIO are > built around. > So, just to 'keep current,' Stratis just hit 2.0.0, but it looks like the planned MD-RAID integration was not added. [1] I think the reason is 2-fold, one ... the LVM/XFS integrated RAID is partially a dependency, and the other is the simple fact that Stratis v1.x really needed a lot of stability improvements. I have a feeling this v2.0.0 will be backported into RHEL8 soon, hence the lack of feature-add. I don't think anyone is using Stratis right now but Fedora/RHEL, and only for those that need some ZFS/btrfs-like features. But I'd love to know if any other distro is integrating it ... especially into their installers, as that's where one of its main advantages lie. But I think we're still a long way from getting greater Upstream buy-in. But at some point it would be ideal for Stratis to become as ubiquitous as the common DM-LVM2 and DM-MPIO tooling. Hopefully it will be there for the next revision ... and with broader Upstream buy-in. - bjs P.S. Red Hat gave up on btrfs years ago, despite offering it as 'Tech Preview' even in RHEL at one point, once Oracle abandoned it after purchasing Sun. But I don't see ZFS ever being legally viable on GNU/Linux for anyone but Oracle, unless Oracle changes its licensing. Yes, I am aware of some of the non-Red Hat moves, but that's always been the case with some other entities (who would always, later, drop support on-a-whim). [1] Stratis 2.0.0 Release Notes - https://stratis-storage.github.io/2019-11-06/ >
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