Awesome, thank you Sage! With that explanation, it's actually a lot easier and less impacting than I thought. :)
Cheers, Linh ________________________________ From: Sage Weil <s...@newdream.net> Sent: Thursday, 19 July 2018 9:35:33 AM To: Linh Vu Cc: Stefan Kooman; ceph-de...@vger.kernel.org; ceph-us...@ceph.com; ceph-maintain...@ceph.com; ceph-annou...@ceph.com Subject: Re: [Ceph-maintainers] [ceph-users] v12.2.7 Luminous released On Wed, 18 Jul 2018, Linh Vu wrote: > Thanks for all your hard work in putting out the fixes so quickly! :) > > We have a cluster on 12.2.5 with Bluestore and EC pool but for CephFS, > not RGW. In the release notes, it says RGW is a risk especially the > garbage collection, and the recommendation is to either pause IO or > disable RGW garbage collection. > > In our case with CephFS, not RGW, is it a lot less risky to perform the > upgrade to 12.2.7 without the need to pause IO? It is hard to quantify. I think we only saw the problem with RGW, but CephFS also sends deletes to non-existent objects when deleting or truncating sparse files. Those are probably not too common in most environments... > What does pause IO do? Do current sessions just get queued up and IO > resume normally with no problem after unpausing? Exactly. As long as the application doesn't have some timeout coded where it gives up when a read or write is taking to long, everything will just pause. > If we have to pause IO, is it better to do something like: pause IO, > restart OSDs on one node, unpause IO - repeated for all the nodes > involved in the EC pool? Yes, that sounds like a great way to proceed! sage
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