From mboxrd@z Thu Jan 1 00:00:00 1970 References: <76b114ca-404b-d7e5-8f59-26336acaadcf@assyoma.it> <0c6c96790329aec2e75505eaf544bade@assyoma.it> <8fee43a1-dd57-f0a5-c9de-8bf74f16afb0@gmail.com> <7d0d218c420d7c687d1a17342da5ca00@xenhideout.nl> <6e9535b6-218c-3f66-2048-88e1fcd21329@redhat.com> <2cea88d3e483b3db671cc8dd446d66d0@xenhideout.nl> From: Eric Ren Message-ID: Date: Mon, 11 Sep 2017 23:31:16 +0800 MIME-Version: 1.0 In-Reply-To: Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] Reserve space for specific thin logical volumes Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Zdenek Kabelac Cc: Xen , LVM general discussion and development Hi Zdenek, On 09/11/2017 09:11 PM, Zdenek Kabelac wrote: [..snip...] > So don't expect lvm2 team will be solving this - there are more prio > work.... Sorry for interrupting your discussion. But, I just cannot help to ask: It's not the first time I see "there are more prio work". So I'm wondering: can upstream consider to have these high priority works available on homepage [1] or trello tool [1]? I really hope upstream can do so. Thus, 1. Users can expect what changes will likely happen for lvm. 2. It helps developer reach agreements on what problems/features should be on high priority and avoid overlap efforts. I know all core developer are working for RedHat. But, I guess you experts will also be happy to see any real contributions from other engineers. For me, some big issues in LVM I can see by now: - lvmetad slows down activation much if there are a lot of PVs on system (say 256 PVs, it takes >10s to pvscan in my testing). - pvmove is slow. I know it's not fault of LVM. The time is almost spent in DM (the IO dispatch/copy). - snapshot cannot be used in cluster environment. There is a usecase: user has a central backup system running on a node. They want to make snapshot and backup some LUNs attached to other nodes, on this backup system node. If our upstream have a place to put and discuss what the prio works are, I think it will encourage me to do more contributions - because I'm not 100% sure if it's a real issue and if it's a work that upstream hopes to see, every engineer wants their work to be accepted by upstream :) I can try to go forward to do meaningful work (research, testing...) as far as I can, if you experts can confirm that "that's a real problem. Go ahead!". [1] https://sourceware.org/lvm2/ [2] https://trello.com/ Regards, Eric