On Thu, Jun 8, 2017 at 3:10 PM, Christian Balzer <chibi@xxxxxxx> wrote: > On Thu, 8 Jun 2017 14:21:43 +1000 Brad Hubbard wrote: > >> On Thu, Jun 8, 2017 at 1:06 PM, Christian Balzer <chibi@xxxxxxx> wrote: >> > >> > Hello, >> > >> > New cluster, Jewel, setting up cache-tiering: >> > --- >> > Error EPERM: 'readforward' is not a well-supported cache mode and may corrupt your data. pass --yes-i-really-mean-it to force. >> > --- >> > >> > That's new and certainly wasn't there in Hammer, nor did it whine about >> > this when upgrading my test cluster to Jewel. >> > >> > And speaking of whining, I did that about this and readproxy, but not >> > their stability (readforward has been working nearly a year flawlessly in >> > the test cluster) but their lack of documentation. >> > >> > So while of course there is no warranty for anything with OSS, is there >> > any real reason for the above scaremongering or is that based solely on >> > lack of testing/experience? >> >> https://github.com/ceph/ceph/pull/8210 and >> https://github.com/ceph/ceph/pull/8210/commits/90fe8e3d0b1ded6d14a6a43ecbd6c8634f691fbe >> may offer some insight. >> > They do, alas of course immediately raise the following questions: > > 1. Where is that mode documented? It *was* documented by, https://github.com/ceph/ceph/pull/7023/commits/d821acada39937b9dacf87614c924114adea8a58 in https://github.com/ceph/ceph/pull/7023 but was removed by https://github.com/ceph/ceph/commit/6b6b38163b7742d97d21457cf38bdcc9bde5ae1a in https://github.com/ceph/ceph/pull/9070 HTH. > > 2. The release notes aren't any particular help there either and issues/PR > talk about forward, not readforward as the culprit. > > 3. What I can gleam from the bits I found, proxy just replaces the forward > functionality. Alas what I'm after is a mode that will not promote reads > to the cache, aka readforward. Or another set of parameters that will > produce the same results. > > Christian > >> > >> > Christian >> > -- >> > Christian Balzer Network/Systems Engineer >> > chibi@xxxxxxx Rakuten Communications >> > _______________________________________________ >> > ceph-users mailing list >> > ceph-users@xxxxxxxxxxxxxx >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> > > > -- > Christian Balzer Network/Systems Engineer > chibi@xxxxxxx Rakuten Communications -- Cheers, Brad _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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