On 1/30/25, 9:28 AM, "Theodore Ts'o" <tytso@xxxxxxx <mailto:tytso@xxxxxxx>> wrote: > On Tue, Jan 28, 2025 at 04:35:46PM +0000, Day, Timothy wrote: > > My biggest question for LSF is around development model: > > Our current development model is still orthogonal to what > > most other subsystems/drivers do. But as we evolve, how do > > we demonstrate that our development model is reasonable? > > Sending the initial patches is one thing. Convincing everyone > > that the model is sustainable is another. > > I suspect one of the reasons why most development is happening out-of-tree > is pretty much all of the users of Lustre are using distro (and very > often, Enterprise) kernels. Are there any people outside of the core > Lustre team (most of whom are probably working for DDN?) that use > Lustre or can even test Lustre using the upstream kernel? Lustre has a lot of usage and development outside of DDN/Whamcloud [1][2]. HPE, AWS, SuSe, Azure, etc. And at least at AWS, we use Lustre on fairly up-to-date kernels [3][4]. And I think this is becoming more common - although I don't have solid data on that. [1] https://en.wikipedia.org/wiki/Lustre_(file_system)#Commercial_technical_support [2] https://youtu.be/BE--ySVQb2M?si=YMHitJfcE4ASWQcE&t=960 [3] AL2023 6.1 - https://github.com/amazonlinux/linux/commit/ef9660091712fa9edd137180b8925ea6316c8043 [4] AL2023 6.12 (Soon) - https://github.com/amazonlinux/linux/commits/amazon-6.12.y/mainline/ > I'll let Andreas to comment further, but from my perspective, if we > want to upstreaming Lustre to be successful, perhaps one strategy > would be to make it easier for upstream users and developers to use > Lustre, perhaps in a smaller scale than what a typical DDN customer > would typically use. If we upstreamed the server alongside the client - it'd be easy enough for upstream developers to setup a collocated Lustre client/server and run xfstests at least. At some point (in the near-ish future), I want to put together a patch series for xfstests/Lustre support. And if you have dedicated hardware - setting up a small filesystem over TCP/IP isn't much harder than an NFS server IMHO. Just a mkfs and mount per storage target. With a single MDS and OSS, you only need two disks. So I think we have everything we need to enable upstream users/devs to use Lustre without too much hassle. I think it's mostly a matter of documentation and scripting. Tim Day
