From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Fri, 20 Oct 2017 23:05:57 -0400 From: Mike Snitzer Message-ID: <20171021030557.GE31049@redhat.com> References: <23016.63588.505141.142275@quad.stoffel.home> <23018.20452.919839.109594@quad.stoffel.home> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <23018.20452.919839.109594@quad.stoffel.home> Subject: Re: [linux-lvm] cache on SSD makes system unresponsive 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" Content-Transfer-Encoding: 7bit To: John Stoffel Cc: LVM general discussion and development On Fri, Oct 20 2017 at 3:35pm -0400, John Stoffel wrote: > >>>>> "Oleg" == Oleg Cherkasov writes: > > I think you're running into a RedHat bug at this point. I'd probably > move to Debian and run my own kernel with the latest patches for MD, etc. There is no reason to think this is a "RedHat bug".. verdict is very much still out (but yes the kernel core is very different in RHEL7 than upstream Linux.. though we have no details to suggest _where_ the issue lies.. if it is a pathologicl dm-cache code issue then RHEL7.4 and upstream Linux should both see the problem). Moving distros is a waste of time given that RHEL7.4 and Centos7.4 have the latest dm-cache code. The issue is likely DM-cache specific (not RHEL7.4 specific). In general: RHEL7 or Centos7 will provide the best support of DM-cache. All developers invested in DM-cache work for Red Hat. Mike