On 11/10/2015 09:49 PM, Vickey Singh wrote: > On Mon, Nov 9, 2015 at 8:16 PM, Wido den Hollander <wido@xxxxxxxx> wrote: > >> On 11/09/2015 05:27 PM, Vickey Singh wrote: >>> Hello Ceph Geeks >>> >>> Need your comments with my understanding on straw2. >>> >>> - Is Straw2 better than straw ? >> >> It is not persé better then straw(1). >> >> straw2 distributes data better when not all OSDs are equally >> sized/weighted. >> >>> - Is it straw2 recommended for production usage ? >>> >> >> I'm using it in multiple clusters and it works fine. >> > > Yes i followed your update on twitter :) > > >> >>> I have a production Ceph Firefly cluster , that i am going to upgrade to >>> Ceph hammer pretty soon. Should i use straw2 for all my ceph pools ? >>> >> >> I would upgrade to Hammer first and make sure that ALL clients are updated. >> >> In case you are using KVM/Qemu, you will have to stop those processes >> first and start them again before they are using the new code. >> > > Thanks a lot for this pointer, i didn't knew this. So restarting KVM / QEMU > process effect running VMs ? ( some downtime ) > Yes. You can also (live) migrate to another host since that will spawn Qemu with fresh code on the other host. But you have to make sure all running/connected clients support straw2 before you enable straw2. > >> >>> Also how can i change from straw to straw2. ( should i decompile crush >> map >>> and replace all straw with straw2) ? >>> >> >> Yes, that's it. Extract, decompile, replace, compile, inject. >> >> $ ceph osd getcrushmap -o crushmap >> $ crushtool -d crushmap -o crushmap.txt >> $ <edit crushmap.txt> >> $ crushtool -c crushmap.txt -o crushmap.new >> $ ceph osd setcrushmap -i crushmap.new >> >> In case stuff goes wrong, inject the original crushmap. >> >> Wido >> > > Thank You so much for your time in replying to my queries :) > > >> >>> Please suggest >>> >>> Thank You in advance. >>> >>> - Vickey - >>> >>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>> >> >> >> -- >> Wido den Hollander >> 42on B.V. >> Ceph trainer and consultant >> >> Phone: +31 (0)20 700 9902 >> Skype: contact42on >> _______________________________________________ >> ceph-users mailing list >> ceph-users@xxxxxxxxxxxxxx >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > -- Wido den Hollander 42on B.V. Ceph trainer and consultant Phone: +31 (0)20 700 9902 Skype: contact42on _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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